feat(token): add Green Points (绿积分) ERC-20 token support

Add support for the dUSDT token "绿积分" (Green Points) on both Android
and Electron applications:

Android changes:
- Add TokenType enum and GreenPointsToken config in Models.kt
- Implement ERC-20 balance fetching and transfer encoding in TssRepository
- Update TransactionUtils with ERC-20 transfer support
- Add dual balance display (KAVA + 绿积分) in WalletsScreen
- Add token type selector in TransferScreen

Electron changes:
- Add TokenType and GREEN_POINTS_TOKEN config in transaction.ts
- Implement fetchGreenPointsBalance and ERC-20 transfer encoding
- Update Home.tsx with dual balance display and token selector
- Add token selector styles in Home.module.css

Token contract: 0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3 (Kava mainnet)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/MainActivity.kt

@@ -17,6 +17,7 @@ import androidx.navigation.compose.composable
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
 import com.durian.tssparty.domain.model.AppReadyState
+import com.durian.tssparty.domain.model.TokenType
 import com.durian.tssparty.presentation.components.BottomNavItem
 import com.durian.tssparty.presentation.components.TssBottomNavigation
 import com.durian.tssparty.presentation.screens.*
@@ -63,6 +64,7 @@ fun TssPartyApp(
     val settings by viewModel.settings.collectAsState()
     val createdInviteCode by viewModel.createdInviteCode.collectAsState()
     val balances by viewModel.balances.collectAsState()
+    val walletBalances by viewModel.walletBalances.collectAsState()
     val currentSessionId by viewModel.currentSessionId.collectAsState()
     val sessionParticipants by viewModel.sessionParticipants.collectAsState()
     val currentRound by viewModel.currentRound.collectAsState()
@@ -167,6 +169,7 @@ fun TssPartyApp(
                     shares = shares,
                     isConnected = uiState.isConnected,
                     balances = balances,
+                    walletBalances = walletBalances,
                     networkType = settings.networkType,
                     onDeleteShare = { viewModel.deleteShare(it) },
                     onRefreshBalance = { address -> viewModel.fetchBalance(address) },
@@ -189,6 +192,7 @@ fun TssPartyApp(
                     TransferScreen(
                         wallet = wallet,
                         balance = balances[wallet.address],
+                        walletBalance = walletBalances[wallet.address],
                         sessionStatus = sessionStatus,
                         participants = signParticipants,
                         currentRound = signCurrentRound,
@@ -202,8 +206,8 @@ fun TssPartyApp(
                         error = uiState.error,
                         networkType = settings.networkType,
                         rpcUrl = settings.kavaRpcUrl,
-                        onPrepareTransaction = { toAddress, amount ->
+                        onPrepareTransaction = { toAddress, amount, tokenType ->
-                            viewModel.prepareTransfer(shareId, toAddress, amount)
+                            viewModel.prepareTransfer(shareId, toAddress, amount, tokenType)
                         },
                         onConfirmTransaction = {
                             viewModel.initiateSignSession(shareId, "")

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/data/repository/TssRepository.kt

@@ -1902,6 +1902,92 @@ class TssRepository @Inject constructor(
         }
     }
 
+    /**
+     * Get Green Points (绿积分/dUSDT) token balance for an address
+     * Uses eth_call to call balanceOf(address) on the ERC-20 contract
+     */
+    suspend fun getGreenPointsBalance(address: String, rpcUrl: String): Result<String> {
+        return withContext(Dispatchers.IO) {
+            try {
+                val client = okhttp3.OkHttpClient()
+                val jsonMediaType = "application/json; charset=utf-8".toMediaType()
+
+                // Encode balanceOf(address) call data
+                // Function selector: 0x70a08231
+                // Address parameter: padded to 32 bytes
+                val paddedAddress = address.removePrefix("0x").lowercase().padStart(64, '0')
+                val callData = "${GreenPointsToken.BALANCE_OF_SELECTOR}$paddedAddress"
+
+                val requestBody = """
+                    {
+                        "jsonrpc": "2.0",
+                        "method": "eth_call",
+                        "params": [{
+                            "to": "${GreenPointsToken.CONTRACT_ADDRESS}",
+                            "data": "$callData"
+                        }, "latest"],
+                        "id": 1
+                    }
+                """.trimIndent()
+
+                val request = okhttp3.Request.Builder()
+                    .url(rpcUrl)
+                    .post(requestBody.toRequestBody(jsonMediaType))
+                    .build()
+
+                val response = client.newCall(request).execute()
+                val responseBody = response.body?.string() ?: return@withContext Result.failure(Exception("Empty response"))
+
+                // Parse JSON response
+                val json = com.google.gson.JsonParser.parseString(responseBody).asJsonObject
+                if (json.has("error")) {
+                    return@withContext Result.failure(Exception(json.get("error").asJsonObject.get("message").asString))
+                }
+
+                val hexBalance = json.get("result").asString
+                // Convert hex to decimal, then apply 6 decimals (dUSDT uses 6 decimals like USDT)
+                val rawBalance = java.math.BigInteger(hexBalance.removePrefix("0x"), 16)
+                val tokenBalance = java.math.BigDecimal(rawBalance).divide(
+                    java.math.BigDecimal("1000000"),  // 10^6 for 6 decimals
+                    6,
+                    java.math.RoundingMode.DOWN
+                )
+
+                Result.success(tokenBalance.toPlainString())
+            } catch (e: Exception) {
+                android.util.Log.e("TssRepository", "Failed to get Green Points balance: ${e.message}")
+                Result.failure(e)
+            }
+        }
+    }
+
+    /**
+     * Get both KAVA and Green Points balances for an address
+     */
+    suspend fun getWalletBalance(address: String, rpcUrl: String): Result<WalletBalance> {
+        return withContext(Dispatchers.IO) {
+            try {
+                // Fetch both balances in parallel
+                val kavaDeferred = async { getBalance(address, rpcUrl) }
+                val greenPointsDeferred = async { getGreenPointsBalance(address, rpcUrl) }
+
+                val kavaResult = kavaDeferred.await()
+                val greenPointsResult = greenPointsDeferred.await()
+
+                val kavaBalance = kavaResult.getOrDefault("0")
+                val greenPointsBalance = greenPointsResult.getOrDefault("0")
+
+                Result.success(WalletBalance(
+                    address = address,
+                    kavaBalance = kavaBalance,
+                    greenPointsBalance = greenPointsBalance
+                ))
+            } catch (e: Exception) {
+                Result.failure(e)
+            }
+        }
+    }
+
     // ========== Transfer / Sign Session Methods ==========
 
     /**
@@ -1912,7 +1998,8 @@ class TssRepository @Inject constructor(
         to: String,
         amount: String,
         rpcUrl: String,
-        chainId: Int = TransactionUtils.KAVA_TESTNET_CHAIN_ID
+        chainId: Int = TransactionUtils.KAVA_TESTNET_CHAIN_ID,
+        tokenType: TokenType = TokenType.KAVA
     ): Result<TransactionUtils.PreparedTransaction> {
         return TransactionUtils.prepareTransaction(
             TransactionUtils.TransactionParams(
@@ -1920,7 +2007,8 @@ class TssRepository @Inject constructor(
                 to = to,
                 amount = amount,
                 rpcUrl = rpcUrl,
-                chainId = chainId
+                chainId = chainId,
+                tokenType = tokenType
             )
         )
     }

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/domain/model/Models.kt

@@ -123,3 +123,38 @@ enum class NetworkType {
     MAINNET,
     TESTNET
 }
+
+/**
+ * Token type for transfers
+ */
+enum class TokenType {
+    KAVA,           // Native KAVA token
+    GREEN_POINTS    // 绿积分 (dUSDT) ERC-20 token
+}
+
+/**
+ * Green Points (绿积分) Token Contract Configuration
+ * dUSDT - Fixed supply ERC-20 token on Kava EVM
+ */
+object GreenPointsToken {
+    const val CONTRACT_ADDRESS = "0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3"
+    const val NAME = "绿积分"
+    const val SYMBOL = "dUSDT"
+    const val DECIMALS = 6
+
+    // ERC-20 function signatures (first 4 bytes of keccak256 hash)
+    const val BALANCE_OF_SELECTOR = "0x70a08231"  // balanceOf(address)
+    const val TRANSFER_SELECTOR = "0xa9059cbb"    // transfer(address,uint256)
+    const val APPROVE_SELECTOR = "0x095ea7b3"     // approve(address,uint256)
+    const val ALLOWANCE_SELECTOR = "0xdd62ed3e"   // allowance(address,address)
+    const val TOTAL_SUPPLY_SELECTOR = "0x18160ddd" // totalSupply()
+}
+
+/**
+ * Wallet balance containing both native and token balances
+ */
+data class WalletBalance(
+    val address: String,
+    val kavaBalance: String = "0",       // Native KAVA balance
+    val greenPointsBalance: String = "0" // 绿积分 (dUSDT) balance
+)

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/screens/HomeScreen.kt

@@ -9,25 +9,34 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import com.durian.tssparty.domain.model.GreenPointsToken
 import com.durian.tssparty.domain.model.ShareRecord
+import com.durian.tssparty.domain.model.WalletBalance
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun HomeScreen(
     shares: List<ShareRecord>,
+    walletBalances: Map<String, WalletBalance>,
     isConnected: Boolean,
     onNavigateToJoin: () -> Unit,
     onNavigateToSign: (Long) -> Unit,
     onNavigateToSettings: () -> Unit,
-    onDeleteShare: (Long) -> Unit
+    onDeleteShare: (Long) -> Unit,
+    onRefreshBalances: () -> Unit = {}
 ) {
     Scaffold(
         topBar = {
             TopAppBar(
                 title = { Text("TSS Party") },
                 actions = {
+                    // Refresh button
+                    IconButton(onClick = onRefreshBalances) {
+                        Icon(Icons.Default.Refresh, contentDescription = "Refresh")
+                    }
                     // Connection status indicator
                     Icon(
                         imageVector = if (isConnected) Icons.Default.CheckCircle else Icons.Default.Warning,
@@ -94,6 +103,7 @@ fun HomeScreen(
                     items(shares) { share ->
                         WalletCard(
                             share = share,
+                            walletBalance = walletBalances[share.address],
                             onSign = { onNavigateToSign(share.id) },
                             onDelete = { onDeleteShare(share.id) }
                         )
@@ -107,6 +117,7 @@ fun HomeScreen(
 @Composable
 fun WalletCard(
     share: ShareRecord,
+    walletBalance: WalletBalance?,
     onSign: () -> Unit,
     onDelete: () -> Unit
 ) {
@@ -138,6 +149,42 @@ fun WalletCard(
                 }
             }
 
+            Spacer(modifier = Modifier.height(12.dp))
+
+            // Balance section
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween
+            ) {
+                // KAVA balance
+                Column {
+                    Text(
+                        text = "KAVA",
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.outline
+                    )
+                    Text(
+                        text = walletBalance?.kavaBalance ?: "Loading...",
+                        style = MaterialTheme.typography.bodyLarge,
+                        fontWeight = FontWeight.Medium
+                    )
+                }
+                // Green Points balance
+                Column(horizontalAlignment = Alignment.End) {
+                    Text(
+                        text = GreenPointsToken.NAME,
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.outline
+                    )
+                    Text(
+                        text = walletBalance?.greenPointsBalance ?: "Loading...",
+                        style = MaterialTheme.typography.bodyLarge,
+                        fontWeight = FontWeight.Medium,
+                        color = MaterialTheme.colorScheme.primary
+                    )
+                }
+            }
+
             Spacer(modifier = Modifier.height(8.dp))
 
             Row(

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/screens/TransferScreen.kt

@@ -27,9 +27,12 @@ import android.graphics.Bitmap
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.ui.graphics.asImageBitmap
+import com.durian.tssparty.domain.model.GreenPointsToken
 import com.durian.tssparty.domain.model.NetworkType
 import com.durian.tssparty.domain.model.SessionStatus
 import com.durian.tssparty.domain.model.ShareRecord
+import com.durian.tssparty.domain.model.TokenType
+import com.durian.tssparty.domain.model.WalletBalance
 import com.durian.tssparty.util.TransactionUtils
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.qrcode.QRCodeWriter
@@ -57,6 +60,7 @@ import java.math.BigInteger
 fun TransferScreen(
     wallet: ShareRecord,
     balance: String?,
+    walletBalance: WalletBalance? = null,
     sessionStatus: SessionStatus,
     participants: List<String> = emptyList(),
     currentRound: Int = 0,
@@ -70,7 +74,7 @@ fun TransferScreen(
     error: String? = null,
     networkType: NetworkType = NetworkType.MAINNET,
     rpcUrl: String = "https://evm.kava.io",
-    onPrepareTransaction: (toAddress: String, amount: String) -> Unit,
+    onPrepareTransaction: (toAddress: String, amount: String, tokenType: TokenType) -> Unit,
     onConfirmTransaction: () -> Unit,
     onCopyInviteCode: () -> Unit,
     onBroadcastTransaction: () -> Unit,
@@ -79,6 +83,7 @@ fun TransferScreen(
 ) {
     var toAddress by remember { mutableStateOf("") }
     var amount by remember { mutableStateOf("") }
+    var selectedTokenType by remember { mutableStateOf(TokenType.KAVA) }
     var validationError by remember { mutableStateOf<String?>(null) }
 
     // QR Scanner launcher for recipient address
@@ -140,6 +145,9 @@ fun TransferScreen(
             "input" -> TransferInputScreen(
                 wallet = wallet,
                 balance = balance,
+                walletBalance = walletBalance,
+                selectedTokenType = selectedTokenType,
+                onTokenTypeChange = { selectedTokenType = it },
                 toAddress = toAddress,
                 onToAddressChange = { toAddress = it },
                 amount = amount,
@@ -147,15 +155,20 @@ fun TransferScreen(
                 error = validationError ?: error,
                 rpcUrl = rpcUrl,
                 onSubmit = {
+                    // Get current balance for the selected token type
+                    val currentBalance = when (selectedTokenType) {
+                        TokenType.KAVA -> walletBalance?.kavaBalance ?: balance
+                        TokenType.GREEN_POINTS -> walletBalance?.greenPointsBalance
+                    }
                     when {
                         toAddress.isBlank() -> validationError = "请输入收款地址"
                         !toAddress.startsWith("0x") || toAddress.length != 42 -> validationError = "地址格式不正确"
                         amount.isBlank() -> validationError = "请输入金额"
                         amount.toDoubleOrNull() == null || amount.toDouble() <= 0 -> validationError = "金额无效"
-                        balance != null && amount.toDouble() > balance.toDouble() -> validationError = "余额不足"
+                        currentBalance != null && amount.toDouble() > currentBalance.toDouble() -> validationError = "余额不足"
                         else -> {
                             validationError = null
-                            onPrepareTransaction(toAddress.trim(), amount.trim())
+                            onPrepareTransaction(toAddress.trim(), amount.trim(), selectedTokenType)
                         }
                     }
                 },
@@ -226,6 +239,9 @@ fun TransferScreen(
 private fun TransferInputScreen(
     wallet: ShareRecord,
     balance: String?,
+    walletBalance: WalletBalance?,
+    selectedTokenType: TokenType,
+    onTokenTypeChange: (TokenType) -> Unit,
     toAddress: String,
     onToAddressChange: (String) -> Unit,
     amount: String,
@@ -238,6 +254,17 @@ private fun TransferInputScreen(
 ) {
     val scope = rememberCoroutineScope()
     var isCalculatingMax by remember { mutableStateOf(false) }
+
+    // Get current balance for the selected token type
+    val currentBalance = when (selectedTokenType) {
+        TokenType.KAVA -> walletBalance?.kavaBalance ?: balance
+        TokenType.GREEN_POINTS -> walletBalance?.greenPointsBalance
+    }
+    val tokenSymbol = when (selectedTokenType) {
+        TokenType.KAVA -> "KAVA"
+        TokenType.GREEN_POINTS -> GreenPointsToken.NAME
+    }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -264,25 +291,96 @@ private fun TransferInputScreen(
                     overflow = TextOverflow.Ellipsis
                 )
                 Spacer(modifier = Modifier.height(8.dp))
+
+                // Show both balances
                 Row(
-                    verticalAlignment = Alignment.CenterVertically
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween
                 ) {
-                    Text(
+                    // KAVA balance
-                        text = "余额: ",
+                    Column {
-                        style = MaterialTheme.typography.bodySmall,
+                        Text(
-                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                            text = "KAVA",
-                    )
+                            style = MaterialTheme.typography.labelSmall,
-                    Text(
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
-                        text = if (balance != null) "$balance KAVA" else "加载中...",
+                        )
-                        style = MaterialTheme.typography.bodySmall,
+                        Text(
-                        fontWeight = FontWeight.Medium,
+                            text = walletBalance?.kavaBalance ?: balance ?: "加载中...",
-                        color = MaterialTheme.colorScheme.primary
+                            style = MaterialTheme.typography.bodySmall,
-                    )
+                            fontWeight = FontWeight.Medium,
+                            color = MaterialTheme.colorScheme.primary
+                        )
+                    }
+                    // Green Points balance
+                    Column(horizontalAlignment = Alignment.End) {
+                        Text(
+                            text = GreenPointsToken.NAME,
+                            style = MaterialTheme.typography.labelSmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                        Text(
+                            text = walletBalance?.greenPointsBalance ?: "加载中...",
+                            style = MaterialTheme.typography.bodySmall,
+                            fontWeight = FontWeight.Medium,
+                            color = Color(0xFF4CAF50)
+                        )
+                    }
                 }
             }
         }
 
-        Spacer(modifier = Modifier.height(24.dp))
+        Spacer(modifier = Modifier.height(16.dp))
+
+        // Token type selector
+        Text(
+            text = "选择转账类型",
+            style = MaterialTheme.typography.labelMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant
+        )
+        Spacer(modifier = Modifier.height(8.dp))
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.spacedBy(8.dp)
+        ) {
+            // KAVA option
+            FilterChip(
+                selected = selectedTokenType == TokenType.KAVA,
+                onClick = { onTokenTypeChange(TokenType.KAVA) },
+                label = { Text("KAVA") },
+                leadingIcon = {
+                    if (selectedTokenType == TokenType.KAVA) {
+                        Icon(
+                            Icons.Default.Check,
+                            contentDescription = null,
+                            modifier = Modifier.size(18.dp)
+                        )
+                    }
+                },
+                modifier = Modifier.weight(1f)
+            )
+            // Green Points option
+            FilterChip(
+                selected = selectedTokenType == TokenType.GREEN_POINTS,
+                onClick = { onTokenTypeChange(TokenType.GREEN_POINTS) },
+                label = { Text(GreenPointsToken.NAME) },
+                leadingIcon = {
+                    if (selectedTokenType == TokenType.GREEN_POINTS) {
+                        Icon(
+                            Icons.Default.Check,
+                            contentDescription = null,
+                            modifier = Modifier.size(18.dp)
+                        )
+                    }
+                },
+                colors = FilterChipDefaults.filterChipColors(
+                    selectedContainerColor = Color(0xFF4CAF50).copy(alpha = 0.2f),
+                    selectedLabelColor = Color(0xFF4CAF50)
+                ),
+                modifier = Modifier.weight(1f)
+            )
+        }
+
+        Spacer(modifier = Modifier.height(16.dp))
 
         // Recipient address with QR scan button
         OutlinedTextField(
@@ -308,30 +406,40 @@ private fun TransferInputScreen(
 
         Spacer(modifier = Modifier.height(16.dp))
 
-        // Amount
+        // Amount with dynamic label based on token type
         OutlinedTextField(
             value = amount,
             onValueChange = onAmountChange,
-            label = { Text("金额 (KAVA)") },
+            label = { Text("金额 ($tokenSymbol)") },
             placeholder = { Text("0.0") },
             modifier = Modifier.fillMaxWidth(),
             singleLine = true,
             keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Decimal),
             leadingIcon = {
-                Icon(Icons.Default.AttachMoney, contentDescription = null)
+                Icon(
+                    if (selectedTokenType == TokenType.GREEN_POINTS) Icons.Default.Stars else Icons.Default.AttachMoney,
+                    contentDescription = null,
+                    tint = if (selectedTokenType == TokenType.GREEN_POINTS) Color(0xFF4CAF50) else MaterialTheme.colorScheme.onSurfaceVariant
+                )
             },
             trailingIcon = {
-                if (balance != null) {
+                if (currentBalance != null) {
                     TextButton(
                         onClick = {
                             scope.launch {
                                 isCalculatingMax = true
-                                val result = TransactionUtils.calculateMaxTransferAmount(balance, rpcUrl)
+                                if (selectedTokenType == TokenType.KAVA) {
-                                result.onSuccess { maxAmount ->
+                                    // For KAVA, calculate max after deducting gas
-                                    onAmountChange(maxAmount)
+                                    val result = TransactionUtils.calculateMaxTransferAmount(currentBalance, rpcUrl)
-                                }.onFailure {
+                                    result.onSuccess { maxAmount ->
-                                    // Fallback to balance if calculation fails
+                                        onAmountChange(maxAmount)
-                                    onAmountChange(balance)
+                                    }.onFailure {
+                                        // Fallback to balance if calculation fails
+                                        onAmountChange(currentBalance)
+                                    }
+                                } else {
+                                    // For tokens, use the full balance
+                                    onAmountChange(currentBalance)
                                 }
                                 isCalculatingMax = false
                             }

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/screens/WalletsScreen.kt

@@ -35,8 +35,10 @@ import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
 import android.content.Intent
 import android.net.Uri
+import com.durian.tssparty.domain.model.GreenPointsToken
 import com.durian.tssparty.domain.model.NetworkType
 import com.durian.tssparty.domain.model.ShareRecord
+import com.durian.tssparty.domain.model.WalletBalance
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.qrcode.QRCodeWriter
 import kotlinx.coroutines.delay
@@ -48,6 +50,7 @@ fun WalletsScreen(
     shares: List<ShareRecord>,
     isConnected: Boolean,
     balances: Map<String, String> = emptyMap(),
+    walletBalances: Map<String, WalletBalance> = emptyMap(),
     networkType: NetworkType = NetworkType.MAINNET,
     onDeleteShare: (Long) -> Unit,
     onRefreshBalance: ((String) -> Unit)? = null,
@@ -146,6 +149,7 @@ fun WalletsScreen(
                     WalletItemCard(
                         share = share,
                         balance = balances[share.address],
+                        walletBalance = walletBalances[share.address],
                         onViewDetails = { selectedWallet = share },
                         onTransfer = {
                             onTransfer?.invoke(share.id)
@@ -196,6 +200,7 @@ fun WalletsScreen(
 private fun WalletItemCard(
     share: ShareRecord,
     balance: String? = null,
+    walletBalance: WalletBalance? = null,
     onViewDetails: () -> Unit,
     onTransfer: () -> Unit,
     onDelete: () -> Unit
@@ -256,31 +261,63 @@ private fun WalletItemCard(
 
             Spacer(modifier = Modifier.height(12.dp))
 
-            // Balance display
+            // Balance display - now shows both KAVA and Green Points
             Row(
-                verticalAlignment = Alignment.CenterVertically
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween
             ) {
-                Icon(
+                // KAVA balance
-                    Icons.Default.AccountBalance,
+                Column {
-                    contentDescription = null,
-                    modifier = Modifier.size(16.dp),
-                    tint = MaterialTheme.colorScheme.primary
-                )
-                Spacer(modifier = Modifier.width(4.dp))
-                if (balance != null) {
                     Text(
-                        text = "$balance KAVA",
+                        text = "KAVA",
-                        style = MaterialTheme.typography.bodyMedium,
+                        style = MaterialTheme.typography.labelSmall,
-                        color = MaterialTheme.colorScheme.primary,
-                        fontWeight = FontWeight.Medium
-                    )
-                } else {
-                    // Loading state
-                    Text(
-                        text = "加载中...",
-                        style = MaterialTheme.typography.bodyMedium,
                         color = MaterialTheme.colorScheme.outline
                     )
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Icon(
+                            Icons.Default.AccountBalance,
+                            contentDescription = null,
+                            modifier = Modifier.size(16.dp),
+                            tint = MaterialTheme.colorScheme.primary
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            text = walletBalance?.kavaBalance ?: balance ?: "加载中...",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = if (walletBalance != null || balance != null)
+                                MaterialTheme.colorScheme.primary
+                            else
+                                MaterialTheme.colorScheme.outline,
+                            fontWeight = FontWeight.Medium
+                        )
+                    }
+                }
+
+                // Green Points (绿积分) balance
+                Column(horizontalAlignment = Alignment.End) {
+                    Text(
+                        text = GreenPointsToken.NAME,
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.outline
+                    )
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Icon(
+                            Icons.Default.Stars,
+                            contentDescription = null,
+                            modifier = Modifier.size(16.dp),
+                            tint = Color(0xFF4CAF50) // Green color for Green Points
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            text = walletBalance?.greenPointsBalance ?: "加载中...",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = if (walletBalance != null)
+                                Color(0xFF4CAF50)
+                            else
+                                MaterialTheme.colorScheme.outline,
+                            fontWeight = FontWeight.Medium
+                        )
+                    }
                 }
             }
 

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt

@@ -1034,22 +1034,31 @@ class MainViewModel @Inject constructor(
         _createdInviteCode.value = null
     }
 
-    // Wallet balances cache
+    // Wallet balances cache (KAVA only - deprecated, use walletBalances instead)
     private val _balances = MutableStateFlow<Map<String, String>>(emptyMap())
     val balances: StateFlow<Map<String, String>> = _balances.asStateFlow()
 
+    // Combined wallet balances (KAVA + Green Points)
+    private val _walletBalances = MutableStateFlow<Map<String, WalletBalance>>(emptyMap())
+    val walletBalances: StateFlow<Map<String, WalletBalance>> = _walletBalances.asStateFlow()
+
     /**
      * Fetch balance for a wallet using share data (handles both EVM and Cosmos address formats)
+     * Now fetches both KAVA and Green Points (绿积分) balances
      */
     fun fetchBalanceForShare(share: ShareRecord) {
         viewModelScope.launch {
             val rpcUrl = _settings.value.kavaRpcUrl
             // Ensure we use EVM address format for RPC calls
             val evmAddress = AddressUtils.getEvmAddress(share.address, share.publicKey)
-            val result = repository.getBalance(evmAddress, rpcUrl)
+
-            result.onSuccess { balance ->
+            // Fetch combined wallet balance (KAVA + Green Points)
-                // Store balance with original address as key (for UI lookup)
+            val result = repository.getWalletBalance(evmAddress, rpcUrl)
-                _balances.update { it + (share.address to balance) }
+            result.onSuccess { walletBalance ->
+                // Store with original address as key (for UI lookup)
+                _walletBalances.update { it + (share.address to walletBalance) }
+                // Also update legacy balances map for backward compatibility
+                _balances.update { it + (share.address to walletBalance.kavaBalance) }
             }
         }
     }
@@ -1060,9 +1069,10 @@ class MainViewModel @Inject constructor(
     fun fetchBalance(address: String) {
         viewModelScope.launch {
             val rpcUrl = _settings.value.kavaRpcUrl
-            val result = repository.getBalance(address, rpcUrl)
+            val result = repository.getWalletBalance(address, rpcUrl)
-            result.onSuccess { balance ->
+            result.onSuccess { walletBalance ->
-                _balances.update { it + (address to balance) }
+                _walletBalances.update { it + (address to walletBalance) }
+                _balances.update { it + (address to walletBalance.kavaBalance) }
             }
         }
     }
@@ -1110,10 +1120,10 @@ class MainViewModel @Inject constructor(
     /**
      * Prepare a transfer transaction
      */
-    fun prepareTransfer(shareId: Long, toAddress: String, amount: String) {
+    fun prepareTransfer(shareId: Long, toAddress: String, amount: String, tokenType: TokenType = TokenType.KAVA) {
         viewModelScope.launch {
             _uiState.update { it.copy(isLoading = true, error = null) }
-            _transferState.update { it.copy(shareId = shareId, toAddress = toAddress, amount = amount) }
+            _transferState.update { it.copy(shareId = shareId, toAddress = toAddress, amount = amount, tokenType = tokenType) }
 
             val share = repository.getShareById(shareId)
             if (share == null) {
@@ -1133,7 +1143,8 @@ class MainViewModel @Inject constructor(
                 to = toAddress,
                 amount = amount,
                 rpcUrl = rpcUrl,
-                chainId = chainId
+                chainId = chainId,
+                tokenType = tokenType
             )
 
             result.fold(
@@ -1347,7 +1358,8 @@ data class MainUiState(
 data class TransferState(
     val shareId: Long = 0,
     val toAddress: String = "",
-    val amount: String = ""
+    val amount: String = "",
+    val tokenType: TokenType = TokenType.KAVA
 )
 
 /**

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/util/TransactionUtils.kt

@@ -1,5 +1,7 @@
 package com.durian.tssparty.util
 
+import com.durian.tssparty.domain.model.GreenPointsToken
+import com.durian.tssparty.domain.model.TokenType
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import okhttp3.MediaType.Companion.toMediaType
@@ -50,14 +52,16 @@ object TransactionUtils {
     data class TransactionParams(
         val from: String,
         val to: String,
-        val amount: String,  // In KAVA (not wei)
+        val amount: String,  // In KAVA or token units (not wei)
         val rpcUrl: String,
-        val chainId: Int = KAVA_TESTNET_CHAIN_ID
+        val chainId: Int = KAVA_TESTNET_CHAIN_ID,
+        val tokenType: TokenType = TokenType.KAVA  // Token type for transfer
     )
 
     /**
      * Prepare a transaction for signing
      * Gets nonce, gas price, estimates gas, and calculates sign hash
+     * Supports both native KAVA transfers and ERC-20 token transfers (绿积分)
      */
     suspend fun prepareTransaction(params: TransactionParams): Result<PreparedTransaction> = withContext(Dispatchers.IO) {
         try {
@@ -67,16 +71,36 @@ object TransactionUtils {
             // 2. Get gas price
             val gasPrice = getGasPrice(params.rpcUrl).getOrThrow()
 
-            // 3. Convert amount to wei (1 KAVA = 10^18 wei)
+            // 3. Prepare transaction based on token type
-            val valueWei = kavaToWei(params.amount)
+            val (toAddress, valueWei, txData) = when (params.tokenType) {
+                TokenType.KAVA -> {
+                    // Native KAVA transfer
+                    Triple(params.to, kavaToWei(params.amount), ByteArray(0))
+                }
+                TokenType.GREEN_POINTS -> {
+                    // ERC-20 token transfer (绿积分)
+                    // To address is the contract, value is 0
+                    // Data is transfer(recipient, amount) encoded
+                    val tokenAmount = greenPointsToRaw(params.amount)
+                    val transferData = encodeErc20Transfer(params.to, tokenAmount)
+                    Triple(GreenPointsToken.CONTRACT_ADDRESS, BigInteger.ZERO, transferData)
+                }
+            }
 
             // 4. Estimate gas
-            val gasLimit = estimateGas(
+            val gasLimit = estimateGasWithData(
                 from = params.from,
-                to = params.to,
+                to = toAddress,
                 value = valueWei,
+                data = txData,
                 rpcUrl = params.rpcUrl
-            ).getOrElse { BigInteger.valueOf(21000) }  // Default for simple transfer
+            ).getOrElse {
+                // Default gas limits
+                when (params.tokenType) {
+                    TokenType.KAVA -> BigInteger.valueOf(21000)
+                    TokenType.GREEN_POINTS -> BigInteger.valueOf(65000)  // ERC-20 transfers need more gas
+                }
+            }
 
             // 5. RLP encode for signing (Legacy Type 0 format)
             // Format: [nonce, gasPrice, gasLimit, to, value, data, chainId, 0, 0]
@@ -84,9 +108,9 @@ object TransactionUtils {
                 nonce = nonce,
                 gasPrice = gasPrice,
                 gasLimit = gasLimit,
-                to = params.to,
+                to = toAddress,
                 value = valueWei,
-                data = ByteArray(0),
+                data = txData,
                 chainId = params.chainId
             )
 
@@ -97,9 +121,10 @@ object TransactionUtils {
                 nonce = nonce,
                 gasPrice = gasPrice,
                 gasLimit = gasLimit,
-                to = params.to,
+                to = toAddress,
                 from = params.from,
                 value = valueWei,
+                data = txData,
                 chainId = params.chainId,
                 signHash = "0x" + signHash.toHexString(),
                 rawTxForSigning = rawTxForSigning
@@ -109,6 +134,41 @@ object TransactionUtils {
         }
     }
 
+    /**
+     * Encode ERC-20 transfer(address,uint256) function call
+     */
+    private fun encodeErc20Transfer(to: String, amount: BigInteger): ByteArray {
+        // Function selector: transfer(address,uint256) = 0xa9059cbb
+        val selector = GreenPointsToken.TRANSFER_SELECTOR.removePrefix("0x").hexToByteArray()
+
+        // Encode recipient address (padded to 32 bytes)
+        val paddedAddress = to.removePrefix("0x").lowercase().padStart(64, '0').hexToByteArray()
+
+        // Encode amount (padded to 32 bytes)
+        val amountHex = amount.toString(16).padStart(64, '0')
+        val paddedAmount = amountHex.hexToByteArray()
+
+        return selector + paddedAddress + paddedAmount
+    }
+
+    /**
+     * Convert Green Points amount to raw units (6 decimals)
+     */
+    fun greenPointsToRaw(amount: String): BigInteger {
+        val decimal = BigDecimal(amount)
+        val rawDecimal = decimal.multiply(BigDecimal("1000000"))  // 10^6
+        return rawDecimal.toBigInteger()
+    }
+
+    /**
+     * Convert raw units to Green Points display amount
+     */
+    fun rawToGreenPoints(raw: BigInteger): String {
+        val rawDecimal = BigDecimal(raw)
+        val displayDecimal = rawDecimal.divide(BigDecimal("1000000"), 6, java.math.RoundingMode.DOWN)
+        return displayDecimal.toPlainString()
+    }
+
     /**
      * Finalize transaction with signature
      * Returns the signed raw transaction hex string ready for broadcast
@@ -297,9 +357,20 @@ object TransactionUtils {
         to: String,
         value: BigInteger,
         rpcUrl: String
+    ): Result<BigInteger> = withContext(Dispatchers.IO) {
+        estimateGasWithData(from, to, value, ByteArray(0), rpcUrl)
+    }
+
+    private suspend fun estimateGasWithData(
+        from: String,
+        to: String,
+        value: BigInteger,
+        data: ByteArray,
+        rpcUrl: String
     ): Result<BigInteger> = withContext(Dispatchers.IO) {
         try {
             val valueHex = "0x" + value.toString(16)
+            val dataHex = if (data.isEmpty()) "" else "\"data\": \"0x${data.toHexString()}\","
             val requestBody = """
                 {
                     "jsonrpc": "2.0",
@@ -307,7 +378,7 @@ object TransactionUtils {
                     "params": [{
                         "from": "$from",
                         "to": "$to",
-                        "value": "$valueHex"
+                        "value": "$valueHex"${if (dataHex.isNotEmpty()) ",\n                        ${dataHex.trimEnd(',')}" else ""}
                     }],
                     "id": 1
                 }

backend/mpc-system/services/service-party-android/contracts/CONTRACT_INFO.md

@@ -0,0 +1,115 @@
+# Durian USDT (dUSDT) 代币合约
+
+## 合约概述
+
+Durian USDT 是一个部署在 Kava EVM 主网上的固定供应量 ERC-20 代币。该合约**完全禁止增发**，所有代币在部署时一次性铸造给部署者地址。
+
+## 合约详情
+
+| 项目 | 值 |
+|------|-----|
+| 合约地址 | `0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3` |
+| 代币名称 | Durian USDT |
+| 代币符号 | dUSDT |
+| 精度 (Decimals) | 6 |
+| 总供应量 | 1,000,000,000,000 dUSDT (1万亿) |
+| 总供应量 (最小单位) | 1,000,000,000,000,000,000 (10^18) |
+
+## 网络信息
+
+| 项目 | 值 |
+|------|-----|
+| 网络名称 | Kava EVM Mainnet |
+| Chain ID | 2222 |
+| RPC URL | https://evm.kava.io |
+| 区块浏览器 | https://kavascan.com |
+| 原生代币 | KAVA |
+
+## 持有人/管理人信息
+
+| 项目 | 值 |
+|------|-----|
+| 地址 | `0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E` |
+| 私钥 | `0x886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a` |
+| 初始 dUSDT 余额 | 1,000,000,000,000 dUSDT (全部) |
+
+> **安全警告**: 私钥必须妥善保管，切勿泄露给他人。
+
+## 部署信息
+
+| 项目 | 值 |
+|------|-----|
+| 部署时间 | 2026-01-02 |
+| 部署交易哈希 | `0xa73d7dce17723bc5a9d62767c515dadf4ccccc26327ed5637958ce817edd671d` |
+| Solidity 版本 | 0.8.19 |
+| EVM 版本 | Paris (无 PUSH0 操作码) |
+| 优化 | 启用 (runs: 200) |
+
+## 合约特性
+
+### 固定供应量 - 无增发机制
+
+该合约的核心特性是**完全禁止增发**：
+
+1. **无 mint 函数**: 合约代码中不存在任何铸造新代币的函数
+2. **无 owner/admin 权限**: 合约没有特权角色，无人能修改供应量
+3. **供应量在构造函数中固定**: 所有代币在部署时一次性创建
+4. **totalSupply 是 constant**: 总供应量声明为常量，无法修改
+
+### 支持的 ERC-20 标准函数
+
+| 函数 | 描述 |
+|------|------|
+| `name()` | 返回代币名称 "Durian USDT" |
+| `symbol()` | 返回代币符号 "dUSDT" |
+| `decimals()` | 返回精度 6 |
+| `totalSupply()` | 返回总供应量 |
+| `balanceOf(address)` | 查询地址余额 |
+| `transfer(address, uint256)` | 转账 |
+| `approve(address, uint256)` | 授权 |
+| `allowance(address, address)` | 查询授权额度 |
+| `transferFrom(address, address, uint256)` | 授权转账 |
+
+## 查看链接
+
+- 合约: https://kavascan.com/address/0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3
+- 持有人: https://kavascan.com/address/0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E
+- 部署交易: https://kavascan.com/tx/0xa73d7dce17723bc5a9d62767c515dadf4ccccc26327ed5637958ce817edd671d
+
+## 在钱包中添加代币
+
+在 MetaMask 或其他钱包中添加自定义代币：
+
+1. 网络: Kava EVM (Chain ID: 2222)
+2. 合约地址: `0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3`
+3. 代币符号: `dUSDT`
+4. 精度: `6`
+
+## 文件说明
+
+| 文件 | 描述 |
+|------|------|
+| `DurianUSDT.sol` | Solidity 源代码 |
+| `DurianUSDT.abi` | 合约 ABI (Application Binary Interface) |
+| `DurianUSDT.bin` | 编译后的字节码 |
+| `CONTRACT_INFO.md` | 本文档 |
+
+## 代码审计要点
+
+该合约经过精简设计，关键安全特性：
+
+1. **无 owner 模式**: 没有特权地址可以执行管理操作
+2. **无升级机制**: 合约不可升级，代码永久固定
+3. **无暂停功能**: 转账功能无法被暂停
+4. **无黑名单功能**: 没有地址可以被限制转账
+5. **使用 unchecked 块**: 在已验证的情况下使用，节省 gas
+
+## 与标准 USDT 的对比
+
+| 特性 | dUSDT | 标准 USDT |
+|------|-------|----------|
+| 精度 | 6 | 6 |
+| 可增发 | 否 | 是 |
+| 可暂停 | 否 | 是 |
+| 黑名单功能 | 否 | 是 |
+| 中心化管理 | 否 | 是 |

backend/mpc-system/services/service-party-android/contracts/DurianUSDT.abi

@@ -0,0 +1,229 @@
+[
+  {
+    "inputs": [],
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "owner",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "value",
+        "type": "uint256"
+      }
+    ],
+    "name": "Approval",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "from",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "to",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "value",
+        "type": "uint256"
+      }
+    ],
+    "name": "Transfer",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "owner",
+        "type": "address"
+      },
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      }
+    ],
+    "name": "allowance",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "approve",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "account",
+        "type": "address"
+      }
+    ],
+    "name": "balanceOf",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "decimals",
+    "outputs": [
+      {
+        "internalType": "uint8",
+        "name": "",
+        "type": "uint8"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "name",
+    "outputs": [
+      {
+        "internalType": "string",
+        "name": "",
+        "type": "string"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "symbol",
+    "outputs": [
+      {
+        "internalType": "string",
+        "name": "",
+        "type": "string"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "totalSupply",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "to",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "transfer",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "from",
+        "type": "address"
+      },
+      {
+        "internalType": "address",
+        "name": "to",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "transferFrom",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]

backend/mpc-system/services/service-party-android/contracts/DurianUSDT.bin

@@ -0,0 +1 @@
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backend/mpc-system/services/service-party-android/contracts/DurianUSDT.sol

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.19;
+
+/**
+ * @title DurianUSDT
+ * @dev Fixed supply ERC-20 token - NO MINTING CAPABILITY
+ * Total Supply: 1,000,000,000,000 (1 Trillion) tokens with 6 decimals (matching USDT)
+ *
+ * IMPORTANT: This contract has NO mint function and NO way to increase supply.
+ * All tokens are minted to the deployer at construction time.
+ */
+contract DurianUSDT {
+    string public constant name = "Durian USDT";
+    string public constant symbol = "dUSDT";
+    uint8 public constant decimals = 6;
+
+    // Fixed total supply: 1 trillion tokens (1,000,000,000,000 * 10^6)
+    uint256 public constant totalSupply = 1_000_000_000_000 * 10**6;
+
+    mapping(address => uint256) private _balances;
+    mapping(address => mapping(address => uint256)) private _allowances;
+
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+
+    /**
+     * @dev Constructor - mints entire fixed supply to deployer
+     * No mint function exists - supply is permanently fixed
+     */
+    constructor() {
+        _balances[msg.sender] = totalSupply;
+        emit Transfer(address(0), msg.sender, totalSupply);
+    }
+
+    function balanceOf(address account) public view returns (uint256) {
+        return _balances[account];
+    }
+
+    function transfer(address to, uint256 amount) public returns (bool) {
+        require(to != address(0), "Transfer to zero address");
+        require(_balances[msg.sender] >= amount, "Insufficient balance");
+
+        unchecked {
+            _balances[msg.sender] -= amount;
+            _balances[to] += amount;
+        }
+
+        emit Transfer(msg.sender, to, amount);
+        return true;
+    }
+
+    function allowance(address owner, address spender) public view returns (uint256) {
+        return _allowances[owner][spender];
+    }
+
+    function approve(address spender, uint256 amount) public returns (bool) {
+        require(spender != address(0), "Approve to zero address");
+        _allowances[msg.sender][spender] = amount;
+        emit Approval(msg.sender, spender, amount);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint256 amount) public returns (bool) {
+        require(from != address(0), "Transfer from zero address");
+        require(to != address(0), "Transfer to zero address");
+        require(_balances[from] >= amount, "Insufficient balance");
+        require(_allowances[from][msg.sender] >= amount, "Insufficient allowance");
+
+        unchecked {
+            _balances[from] -= amount;
+            _balances[to] += amount;
+            _allowances[from][msg.sender] -= amount;
+        }
+
+        emit Transfer(from, to, amount);
+        return true;
+    }
+}

backend/mpc-system/services/service-party-android/contracts/KAVA_NETWORK.md

@@ -0,0 +1,120 @@
+# Kava EVM 网络配置
+
+## 主网配置
+
+| 项目 | 值 |
+|------|-----|
+| 网络名称 | Kava EVM Mainnet |
+| Chain ID | 2222 |
+| Currency Symbol | KAVA |
+| RPC URL | https://evm.kava.io |
+| WebSocket URL | wss://wevm.kava.io |
+| 区块浏览器 | https://kavascan.com |
+
+## 测试网配置
+
+| 项目 | 值 |
+|------|-----|
+| 网络名称 | Kava EVM Testnet |
+| Chain ID | 2221 |
+| Currency Symbol | KAVA |
+| RPC URL | https://evm.testnet.kava.io |
+| 区块浏览器 | https://testnet.kavascan.com |
+| 水龙头 | https://faucet.kava.io |
+
+## RPC 端点列表
+
+### 主网 RPC
+
+```
+https://evm.kava.io
+https://kava-evm.publicnode.com
+https://kava.api.onfinality.io/public
+https://evm.kava.chainstacklabs.com
+```
+
+### WebSocket (主网)
+
+```
+wss://wevm.kava.io
+wss://kava-evm.publicnode.com
+```
+
+## Gas 配置
+
+| 项目 | 值 |
+|------|-----|
+| Gas Price | ~1 Gwei (动态) |
+| 合约部署 Gas Limit | ~500,000 - 1,000,000 |
+| 代币转账 Gas Limit | ~65,000 |
+| 原生转账 Gas Limit | ~21,000 |
+
+## 在 MetaMask 中添加网络
+
+### 主网
+
+1. 打开 MetaMask
+2. 点击网络选择器 > 添加网络
+3. 填写以下信息:
+   - 网络名称: `Kava EVM`
+   - RPC URL: `https://evm.kava.io`
+   - Chain ID: `2222`
+   - 货币符号: `KAVA`
+   - 区块浏览器: `https://kavascan.com`
+
+### 测试网
+
+1. 打开 MetaMask
+2. 点击网络选择器 > 添加网络
+3. 填写以下信息:
+   - 网络名称: `Kava EVM Testnet`
+   - RPC URL: `https://evm.testnet.kava.io`
+   - Chain ID: `2221`
+   - 货币符号: `KAVA`
+   - 区块浏览器: `https://testnet.kavascan.com`
+
+## Kava 双地址系统
+
+Kava 网络支持两种地址格式:
+
+| 类型 | 格式 | 示例 |
+|------|------|------|
+| Cosmos 地址 | kava1... | `kava1...abc` |
+| EVM 地址 | 0x... | `0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E` |
+
+同一个私钥可以派生出两种地址，它们共享相同的余额。
+
+## EVM 兼容性
+
+Kava EVM 兼容以太坊 EVM，支持:
+
+- Solidity 智能合约
+- ERC-20/ERC-721/ERC-1155 代币标准
+- Web3.js / ethers.js
+- MetaMask 等以太坊钱包
+
+### 注意事项
+
+- Kava EVM **不支持 PUSH0 操作码** (Shanghai 升级的特性)
+- 编译合约时需要使用 `evmVersion: "paris"` 或更早版本
+- 推荐使用 Solidity 0.8.19 或更早版本
+
+## 常用合约地址
+
+### 主网
+
+| 代币 | 地址 |
+|------|------|
+| WKAVA (Wrapped KAVA) | `0xc86c7C0eFbd6A49B35E8714C5f59D99De09A225b` |
+| USDT | `0x919C1c267BC06a7039e03fcc2eF738525769109c` |
+| USDC | `0xfA9343C3897324496A05fC75abeD6bAC29f8A40f` |
+| DAI | `0x765277EebeCA2e31912C9946eAe1021199B39C61` |
+| dUSDT (Durian USDT) | `0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3` |
+
+## 资源链接
+
+- 官网: https://www.kava.io/
+- 文档: https://docs.kava.io/
+- GitHub: https://github.com/Kava-Labs
+- 区块浏览器: https://kavascan.com/
+- Discord: https://discord.com/invite/kQzh3Uv

backend/mpc-system/services/service-party-android/contracts/WALLET_KEYS.md

@@ -0,0 +1,83 @@
+# 钱包密钥信息
+
+> **重要安全警告**: 本文件包含私钥，仅供内部使用。切勿将此文件提交到公开仓库或分享给他人。
+
+## 管理员钱包
+
+该钱包用于部署和管理 dUSDT 代币合约。
+
+### 地址信息
+
+| 项目 | 值 |
+|------|-----|
+| EVM 地址 | `0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E` |
+| 私钥 | `0x886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a` |
+
+### 余额信息
+
+| 代币 | 余额 | 备注 |
+|------|------|------|
+| KAVA | ~0.45 KAVA | 用于支付 Gas 费用 |
+| dUSDT | 1,000,000,000,000 | 1万亿，全部供应量 |
+
+### 查看链接
+
+- 地址: https://kavascan.com/address/0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E
+
+## 导入钱包
+
+### MetaMask
+
+1. 打开 MetaMask
+2. 点击账户图标 > 导入账户
+3. 选择类型: 私钥
+4. 粘贴私钥: `886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a`
+5. 点击导入
+
+### ethers.js
+
+```javascript
+import { ethers } from 'ethers';
+
+const PRIVATE_KEY = '0x886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a';
+const provider = new ethers.JsonRpcProvider('https://evm.kava.io');
+const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
+
+console.log('Address:', wallet.address);
+// Output: 0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E
+```
+
+### Android/Kotlin
+
+```kotlin
+// 使用 Web3j 或其他库
+val privateKey = "886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a"
+val credentials = Credentials.create(privateKey)
+println("Address: ${credentials.address}")
+// Output: 0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E
+```
+
+## 地址派生
+
+该地址是通过以下步骤从私钥派生的:
+
+1. 私钥 (32 bytes): `886ea4cffe76c386fecf3ff321ac9ae913737c46c17bc6ce2413752144668a2a`
+2. 公钥 (65 bytes, uncompressed): `047e0b2f84204a2f859f51be78e09af3c504e9525f49d8ab1c537ab9c2a4deb28c3b16870449f50b9b79e959649a78144a5329958a95f6697534be0156b421588b`
+3. Keccak-256(公钥[1:65])
+4. 取后 20 bytes: `4f7e78d6b7c5fc502ec7039848690f08c8970f1e`
+5. 添加 0x 前缀: `0x4F7E78d6B7C5FC502Ec7039848690f08c8970F1E` (含校验和)
+
+## 安全建议
+
+1. **备份私钥**: 将私钥安全存储在离线环境中
+2. **不要分享**: 永远不要将私钥分享给任何人
+3. **不要提交**: 确保 .gitignore 包含此文件
+4. **硬件钱包**: 考虑将大额资产转移到硬件钱包
+5. **多签**: 对于生产环境，考虑使用多签钱包
+
+## 相关交易
+
+### 合约部署交易
+
+- 交易哈希: `0xa73d7dce17723bc5a9d62767c515dadf4ccccc26327ed5637958ce817edd671d`
+- 查看: https://kavascan.com/tx/0xa73d7dce17723bc5a9d62767c515dadf4ccccc26327ed5637958ce817edd671d

backend/mpc-system/services/service-party-app/src/pages/Home.module.css

@@ -377,14 +377,20 @@
 /* Balance Section */
 .balanceSection {
   display: flex;
-  justify-content: space-between;
+  flex-direction: column;
-  align-items: center;
+  gap: var(--spacing-sm);
   padding: var(--spacing-md);
   margin-bottom: var(--spacing-md);
   background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   border-radius: var(--radius-md);
 }
 
+.balanceRow {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
 .balanceLabel {
   font-size: 12px;
   color: rgba(255, 255, 255, 0.85);
@@ -519,6 +525,42 @@
   color: white;
 }
 
+/* Token Type Selector */
+.tokenTypeSelector {
+  display: flex;
+  gap: var(--spacing-sm);
+}
+
+.tokenTypeButton {
+  flex: 1;
+  padding: var(--spacing-sm) var(--spacing-md);
+  background-color: transparent;
+  color: var(--text-secondary);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-md);
+  font-size: 14px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.tokenTypeButton:hover {
+  border-color: var(--primary-color);
+  color: var(--primary-color);
+}
+
+.tokenTypeActive {
+  background-color: var(--primary-color);
+  color: white;
+  border-color: var(--primary-color);
+}
+
+.tokenTypeActive:hover {
+  background-color: var(--primary-light);
+  border-color: var(--primary-light);
+  color: white;
+}
+
 .transferError {
   background-color: rgba(220, 53, 69, 0.1);
   color: #dc3545;

backend/mpc-system/services/service-party-app/src/pages/Home.tsx

@@ -10,7 +10,10 @@ import {
   getCurrentNetwork,
   getCurrentRpcUrl,
   getGasPrice,
+  fetchGreenPointsBalance,
+  GREEN_POINTS_TOKEN,
   type PreparedTransaction,
+  type TokenType,
 } from '../utils/transaction';
 
 interface ShareItem {
@@ -28,6 +31,7 @@ interface ShareItem {
 interface ShareWithAddress extends ShareItem {
   evmAddress?: string;
   kavaBalance?: string;
+  greenPointsBalance?: string;
   balanceLoading?: boolean;
 }
 
@@ -78,6 +82,7 @@ export default function Home() {
   const [transferTo, setTransferTo] = useState('');
   const [transferAmount, setTransferAmount] = useState('');
   const [transferPassword, setTransferPassword] = useState('');
+  const [transferTokenType, setTransferTokenType] = useState<TokenType>('KAVA');
   const [transferStep, setTransferStep] = useState<'input' | 'confirm' | 'preparing' | 'error'>('input');
   const [transferError, setTransferError] = useState<string | null>(null);
   const [preparedTx, setPreparedTx] = useState<PreparedTransaction | null>(null);
@@ -86,44 +91,56 @@ export default function Home() {
 
   // 计算扣除 Gas 费后的最大可转账金额
   const calculateMaxAmount = async () => {
-    if (!transferShare?.kavaBalance || !transferShare?.evmAddress) return;
+    if (!transferShare?.evmAddress) return;
 
     setIsCalculatingMax(true);
     try {
-      const balance = parseFloat(transferShare.kavaBalance);
+      if (transferTokenType === 'GREEN_POINTS') {
-      if (balance <= 0) {
+        // For token transfers, use the full token balance (gas is paid in KAVA)
-        setTransferAmount('0');
+        const balance = transferShare.greenPointsBalance || '0';
-        return;
+        setTransferAmount(balance);
-      }
-
-      // 获取当前 gas 价格
-      const { maxFeePerGas } = await getGasPrice();
-      // 简单转账的 gas 限制是 21000
-      const gasLimit = BigInt(21000);
-      const gasFee = maxFeePerGas * gasLimit;
-      // 转换为 KAVA (18 位小数)
-      const gasFeeKava = Number(gasFee) / 1e18;
-
-      // 计算最大可转账金额 = 余额 - Gas费
-      const maxAmount = balance - gasFeeKava;
-
-      if (maxAmount <= 0) {
-        setTransferError('余额不足以支付 Gas 费');
-        setTransferAmount('0');
-      } else {
-        // 保留 6 位小数，向下取整避免精度问题
-        const formattedMax = Math.floor(maxAmount * 1000000) / 1000000;
-        setTransferAmount(formattedMax.toString());
         setTransferError(null);
+      } else {
+        // For KAVA transfers, deduct gas fee
+        const balance = parseFloat(transferShare.kavaBalance || '0');
+        if (balance <= 0) {
+          setTransferAmount('0');
+          return;
+        }
+
+        // 获取当前 gas 价格
+        const { maxFeePerGas } = await getGasPrice();
+        // 简单转账的 gas 限制是 21000
+        const gasLimit = BigInt(21000);
+        const gasFee = maxFeePerGas * gasLimit;
+        // 转换为 KAVA (18 位小数)
+        const gasFeeKava = Number(gasFee) / 1e18;
+
+        // 计算最大可转账金额 = 余额 - Gas费
+        const maxAmount = balance - gasFeeKava;
+
+        if (maxAmount <= 0) {
+          setTransferError('余额不足以支付 Gas 费');
+          setTransferAmount('0');
+        } else {
+          // 保留 6 位小数，向下取整避免精度问题
+          const formattedMax = Math.floor(maxAmount * 1000000) / 1000000;
+          setTransferAmount(formattedMax.toString());
+          setTransferError(null);
+        }
       }
     } catch (error) {
       console.error('Failed to calculate max amount:', error);
-      // 如果获取 Gas 失败，使用默认估算 (1 gwei * 21000)
+      if (transferTokenType === 'GREEN_POINTS') {
-      const defaultGasFee = 0.000021; // ~21000 * 1 gwei
+        setTransferAmount(transferShare.greenPointsBalance || '0');
-      const balance = parseFloat(transferShare.kavaBalance);
+      } else {
-      const maxAmount = Math.max(0, balance - defaultGasFee);
+        // 如果获取 Gas 失败，使用默认估算 (1 gwei * 21000)
-      const formattedMax = Math.floor(maxAmount * 1000000) / 1000000;
+        const defaultGasFee = 0.000021; // ~21000 * 1 gwei
-      setTransferAmount(formattedMax.toString());
+        const balance = parseFloat(transferShare.kavaBalance || '0');
+        const maxAmount = Math.max(0, balance - defaultGasFee);
+        const formattedMax = Math.floor(maxAmount * 1000000) / 1000000;
+        setTransferAmount(formattedMax.toString());
+      }
     } finally {
       setIsCalculatingMax(false);
     }
@@ -143,13 +160,17 @@ export default function Home() {
     return sharesWithAddresses;
   }, []);
 
-  // 单独获取所有钱包的余额
+  // 单独获取所有钱包的余额 (KAVA 和 绿积分)
   const fetchAllBalances = useCallback(async (sharesWithAddrs: ShareWithAddress[]) => {
     const updatedShares = await Promise.all(
       sharesWithAddrs.map(async (share) => {
         if (share.evmAddress) {
-          const kavaBalance = await fetchKavaBalance(share.evmAddress);
+          // Fetch both balances in parallel
-          return { ...share, kavaBalance, balanceLoading: false };
+          const [kavaBalance, greenPointsBalance] = await Promise.all([
+            fetchKavaBalance(share.evmAddress),
+            fetchGreenPointsBalance(share.evmAddress),
+          ]);
+          return { ...share, kavaBalance, greenPointsBalance, balanceLoading: false };
         }
         return { ...share, balanceLoading: false };
       })
@@ -265,6 +286,7 @@ export default function Home() {
     setTransferTo('');
     setTransferAmount('');
     setTransferPassword('');
+    setTransferTokenType('KAVA');
     setTransferStep('input');
     setTransferError(null);
     setPreparedTx(null);
@@ -293,7 +315,11 @@ export default function Home() {
       return '转账金额无效';
     }
     const amount = parseFloat(transferAmount);
-    const balance = parseFloat(transferShare?.kavaBalance || '0');
+    const balance = parseFloat(
+      transferTokenType === 'GREEN_POINTS'
+        ? (transferShare?.greenPointsBalance || '0')
+        : (transferShare?.kavaBalance || '0')
+    );
     if (amount > balance) {
       return '余额不足';
     }
@@ -316,6 +342,7 @@ export default function Home() {
         from: transferShare!.evmAddress!,
         to: transferTo.trim().toLowerCase(),
         value: transferAmount.trim(),
+        tokenType: transferTokenType,
       });
       setPreparedTx(prepared);
       setTransferStep('confirm');
@@ -352,6 +379,7 @@ export default function Home() {
           amount: transferAmount,
           from: transferShare.evmAddress,
           walletName: transferShare.walletName,
+          tokenType: transferTokenType,
         };
         sessionStorage.setItem(`tx_${result.sessionId}`, JSON.stringify(txToStore));
 
@@ -458,17 +486,29 @@ export default function Home() {
                   </div>
                 )}
 
-                {/* KAVA 余额显示 */}
+                {/* 余额显示 - KAVA 和 绿积分 */}
                 {share.evmAddress && (
                   <div className={styles.balanceSection}>
-                    <span className={styles.balanceLabel}>KAVA 余额</span>
+                    <div className={styles.balanceRow}>
-                    <span className={styles.balanceValue}>
+                      <span className={styles.balanceLabel}>KAVA</span>
-                      {share.balanceLoading ? (
+                      <span className={styles.balanceValue}>
-                        <span className={styles.balanceLoading}>加载中...</span>
+                        {share.balanceLoading ? (
-                      ) : (
+                          <span className={styles.balanceLoading}>加载中...</span>
-                        <>{share.kavaBalance || '0'} KAVA</>
+                        ) : (
-                      )}
+                          <>{share.kavaBalance || '0'}</>
-                    </span>
+                        )}
+                      </span>
+                    </div>
+                    <div className={styles.balanceRow}>
+                      <span className={styles.balanceLabel} style={{ color: '#4CAF50' }}>{GREEN_POINTS_TOKEN.name}</span>
+                      <span className={styles.balanceValue} style={{ color: '#4CAF50' }}>
+                        {share.balanceLoading ? (
+                          <span className={styles.balanceLoading}>加载中...</span>
+                        ) : (
+                          <>{share.greenPointsBalance || '0'}</>
+                        )}
+                      </span>
+                    </div>
                   </div>
                 )}
 
@@ -538,7 +578,7 @@ export default function Home() {
               <div className={styles.transferWalletInfo}>
                 <div className={styles.transferWalletName}>{transferShare.walletName}</div>
                 <div className={styles.transferWalletBalance}>
-                  余额: {transferShare.kavaBalance || '0'} KAVA
+                  KAVA: {transferShare.kavaBalance || '0'} | {GREEN_POINTS_TOKEN.name}: {transferShare.greenPointsBalance || '0'}
                 </div>
                 <div className={styles.transferNetwork}>
                   网络: Kava {getCurrentNetwork() === 'mainnet' ? '主网' : '测试网'}
@@ -547,6 +587,26 @@ export default function Home() {
 
               {transferStep === 'input' && (
                 <div className={styles.transferForm}>
+                  {/* 代币类型选择 */}
+                  <div className={styles.transferInputGroup}>
+                    <label className={styles.transferLabel}>转账类型</label>
+                    <div className={styles.tokenTypeSelector}>
+                      <button
+                        className={`${styles.tokenTypeButton} ${transferTokenType === 'KAVA' ? styles.tokenTypeActive : ''}`}
+                        onClick={() => { setTransferTokenType('KAVA'); setTransferAmount(''); }}
+                      >
+                        KAVA
+                      </button>
+                      <button
+                        className={`${styles.tokenTypeButton} ${transferTokenType === 'GREEN_POINTS' ? styles.tokenTypeActive : ''}`}
+                        onClick={() => { setTransferTokenType('GREEN_POINTS'); setTransferAmount(''); }}
+                        style={transferTokenType === 'GREEN_POINTS' ? { backgroundColor: '#4CAF50', borderColor: '#4CAF50' } : {}}
+                      >
+                        {GREEN_POINTS_TOKEN.name}
+                      </button>
+                    </div>
+                  </div>
+
                   {/* 收款地址 */}
                   <div className={styles.transferInputGroup}>
                     <label className={styles.transferLabel}>收款地址</label>
@@ -561,7 +621,9 @@ export default function Home() {
 
                   {/* 转账金额 */}
                   <div className={styles.transferInputGroup}>
-                    <label className={styles.transferLabel}>转账金额 (KAVA)</label>
+                    <label className={styles.transferLabel}>
+                      转账金额 ({transferTokenType === 'GREEN_POINTS' ? GREEN_POINTS_TOKEN.name : 'KAVA'})
+                    </label>
                     <div className={styles.transferAmountWrapper}>
                       <input
                         type="text"
@@ -625,13 +687,21 @@ export default function Home() {
                   <h3 className={styles.confirmTitle}>确认交易</h3>
 
                   <div className={styles.confirmDetails}>
+                    <div className={styles.confirmRow}>
+                      <span className={styles.confirmLabel}>转账类型</span>
+                      <span className={styles.confirmValue} style={transferTokenType === 'GREEN_POINTS' ? { color: '#4CAF50' } : {}}>
+                        {transferTokenType === 'GREEN_POINTS' ? GREEN_POINTS_TOKEN.name : 'KAVA'}
+                      </span>
+                    </div>
                     <div className={styles.confirmRow}>
                       <span className={styles.confirmLabel}>收款地址</span>
                       <span className={styles.confirmValue}>{formatAddress(transferTo, 8, 6)}</span>
                     </div>
                     <div className={styles.confirmRow}>
                       <span className={styles.confirmLabel}>转账金额</span>
-                      <span className={styles.confirmValue}>{transferAmount} KAVA</span>
+                      <span className={styles.confirmValue} style={transferTokenType === 'GREEN_POINTS' ? { color: '#4CAF50' } : {}}>
+                        {transferAmount} {transferTokenType === 'GREEN_POINTS' ? GREEN_POINTS_TOKEN.name : 'KAVA'}
+                      </span>
                     </div>
                     <div className={styles.confirmRow}>
                       <span className={styles.confirmLabel}>预估 Gas 费</span>

backend/mpc-system/services/service-party-app/src/utils/transaction.ts

@@ -1,6 +1,7 @@
 /**
  * Kava EVM 交易构建工具
  * 用于构建 EIP-1559 交易并计算签名哈希
+ * 支持原生 KAVA 和 ERC-20 代币 (绿积分) 转账
  */
 
 // Kava EVM Chain IDs
@@ -15,6 +16,20 @@ export const KAVA_RPC_URL = {
   testnet: 'https://evm.testnet.kava.io',
 };
 
+// Token types
+export type TokenType = 'KAVA' | 'GREEN_POINTS';
+
+// Green Points (绿积分) Token Configuration
+export const GREEN_POINTS_TOKEN = {
+  contractAddress: '0xA9F3A35dBa8699c8C681D8db03F0c1A8CEB9D7c3',
+  name: '绿积分',
+  symbol: 'dUSDT',
+  decimals: 6,
+  // ERC-20 function selectors
+  balanceOfSelector: '0x70a08231',
+  transferSelector: '0xa9059cbb',
+};
+
 // 当前网络配置 (从 localStorage 读取或使用默认值)
 export function getCurrentNetwork(): 'mainnet' | 'testnet' {
   if (typeof window !== 'undefined' && window.localStorage) {
@@ -39,13 +54,14 @@ export function getCurrentRpcUrl(): string {
  */
 export interface TransactionParams {
   to: string;           // 收款地址
-  value: string;        // 转账金额 (KAVA, 字符串以支持大数)
+  value: string;        // 转账金额 (KAVA 或代币单位, 字符串以支持大数)
   from: string;         // 发送地址
   nonce?: number;       // 可选，自动获取
   gasLimit?: bigint;    // 可选，默认 21000
   maxFeePerGas?: bigint;     // 可选，自动获取
   maxPriorityFeePerGas?: bigint; // 可选，自动获取
   data?: string;        // 可选，合约调用数据
+  tokenType?: TokenType; // 可选，默认 KAVA
 }
 
 /**
@@ -310,6 +326,88 @@ export function weiToKava(wei: bigint): string {
   return fraction ? `${whole}.${fraction}` : whole;
 }
 
+/**
+ * 将绿积分金额转换为最小单位 (6 decimals)
+ */
+export function greenPointsToRaw(amount: string): bigint {
+  const parts = amount.split('.');
+  const whole = BigInt(parts[0] || '0');
+  let fraction = parts[1] || '';
+
+  // 补齐或截断到 6 位
+  if (fraction.length > 6) {
+    fraction = fraction.substring(0, 6);
+  } else {
+    fraction = fraction.padEnd(6, '0');
+  }
+
+  return whole * BigInt(10 ** 6) + BigInt(fraction);
+}
+
+/**
+ * 将最小单位转换为绿积分金额
+ */
+export function rawToGreenPoints(raw: bigint): string {
+  const rawStr = raw.toString().padStart(7, '0');
+  const whole = rawStr.slice(0, -6) || '0';
+  const fraction = rawStr.slice(-6).replace(/0+$/, '');
+  return fraction ? `${whole}.${fraction}` : whole;
+}
+
+/**
+ * 查询绿积分 (ERC-20) 余额
+ */
+export async function fetchGreenPointsBalance(address: string): Promise<string> {
+  try {
+    const rpcUrl = getCurrentRpcUrl();
+    // Encode balanceOf(address) call data
+    // Function selector: 0x70a08231
+    // Address parameter: padded to 32 bytes
+    const paddedAddress = address.toLowerCase().replace('0x', '').padStart(64, '0');
+    const callData = GREEN_POINTS_TOKEN.balanceOfSelector + paddedAddress;
+
+    const response = await fetch(rpcUrl, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        jsonrpc: '2.0',
+        method: 'eth_call',
+        params: [
+          {
+            to: GREEN_POINTS_TOKEN.contractAddress,
+            data: callData,
+          },
+          'latest',
+        ],
+        id: 1,
+      }),
+    });
+
+    const data = await response.json();
+    if (data.result && data.result !== '0x') {
+      const balanceRaw = BigInt(data.result);
+      return rawToGreenPoints(balanceRaw);
+    }
+    return '0';
+  } catch (error) {
+    console.error('Failed to fetch Green Points balance:', error);
+    return '0';
+  }
+}
+
+/**
+ * Encode ERC-20 transfer function call
+ */
+function encodeErc20Transfer(to: string, amount: bigint): string {
+  // Function selector: transfer(address,uint256) = 0xa9059cbb
+  const selector = GREEN_POINTS_TOKEN.transferSelector;
+  // Encode recipient address (padded to 32 bytes)
+  const paddedAddress = to.toLowerCase().replace('0x', '').padStart(64, '0');
+  // Encode amount (padded to 32 bytes)
+  const amountHex = amount.toString(16).padStart(64, '0');
+  return selector + paddedAddress + amountHex;
+}
+
 /**
  * 通过 RPC 获取账户 nonce
  */
@@ -371,29 +469,49 @@ export async function getGasPrice(): Promise<{ maxFeePerGas: bigint; maxPriority
 /**
  * 预估 gas 用量
  */
-export async function estimateGas(params: { from: string; to: string; value: string; data?: string }): Promise<bigint> {
+export async function estimateGas(params: { from: string; to: string; value: string; data?: string; tokenType?: TokenType }): Promise<bigint> {
   const rpcUrl = getCurrentRpcUrl();
+  const tokenType = params.tokenType || 'KAVA';
+
+  // For token transfers, we need different params
+  let txParams: { from: string; to: string; value: string; data?: string };
+
+  if (tokenType === 'GREEN_POINTS') {
+    // ERC-20 transfer: to is contract, value is 0, data is transfer call
+    const tokenAmount = greenPointsToRaw(params.value);
+    const transferData = encodeErc20Transfer(params.to, tokenAmount);
+    txParams = {
+      from: params.from,
+      to: GREEN_POINTS_TOKEN.contractAddress,
+      value: '0x0',
+      data: transferData,
+    };
+  } else {
+    // Native KAVA transfer
+    txParams = {
+      from: params.from,
+      to: params.to,
+      value: toHex(kavaToWei(params.value)),
+      data: params.data || '0x',
+    };
+  }
+
   const response = await fetch(rpcUrl, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify({
       jsonrpc: '2.0',
       method: 'eth_estimateGas',
-      params: [{
+      params: [txParams],
-        from: params.from,
-        to: params.to,
-        value: toHex(kavaToWei(params.value)),
-        data: params.data || '0x',
-      }],
       id: 1,
     }),
   });
 
   const data = await response.json();
   if (data.error) {
-    // 如果估算失败，使用默认值 21000 (普通转账)
+    // 如果估算失败，使用默认值
     console.warn('Gas 估算失败，使用默认值:', data.error);
-    return BigInt(21000);
+    return tokenType === 'GREEN_POINTS' ? BigInt(65000) : BigInt(21000);
   }
   return BigInt(data.result);
 }
@@ -402,9 +520,11 @@ export async function estimateGas(params: { from: string; to: string; value: str
  * 准备 Legacy 交易 (Type 0)
  * KAVA 不支持 EIP-1559，所以使用 Legacy 格式
  * 返回交易数据和待签名的哈希
+ * 支持原生 KAVA 和 ERC-20 代币 (绿积分) 转账
  */
 export async function prepareTransaction(params: TransactionParams): Promise<PreparedTransaction> {
   const chainId = getCurrentChainId();
+  const tokenType = params.tokenType || 'KAVA';
 
   // 获取或使用提供的参数
   const nonce = params.nonce ?? await getNonce(params.from);
@@ -415,10 +535,28 @@ export async function prepareTransaction(params: TransactionParams): Promise<Pre
     to: params.to,
     value: params.value,
     data: params.data,
+    tokenType,
   });
 
-  const value = kavaToWei(params.value);
+  // Prepare transaction based on token type
-  const data = params.data || '0x';
+  let toAddress: string;
+  let value: bigint;
+  let data: string;
+
+  if (tokenType === 'GREEN_POINTS') {
+    // ERC-20 token transfer
+    // To address is the contract, value is 0
+    // Data is transfer(recipient, amount) encoded
+    const tokenAmount = greenPointsToRaw(params.value);
+    toAddress = GREEN_POINTS_TOKEN.contractAddress.toLowerCase();
+    value = BigInt(0);
+    data = encodeErc20Transfer(params.to, tokenAmount);
+  } else {
+    // Native KAVA transfer
+    toAddress = params.to.toLowerCase();
+    value = kavaToWei(params.value);
+    data = params.data || '0x';
+  }
 
   // Legacy 交易字段顺序 (EIP-155)
   // [nonce, gasPrice, gasLimit, to, value, data, chainId, 0, 0]
@@ -427,7 +565,7 @@ export async function prepareTransaction(params: TransactionParams): Promise<Pre
     nonce,
     gasPrice,
     gasLimit,
-    params.to.toLowerCase(),
+    toAddress,
     value,
     data,
     chainId,
@@ -447,7 +585,7 @@ export async function prepareTransaction(params: TransactionParams): Promise<Pre
     nonce,
     gasPrice,
     gasLimit,
-    to: params.to.toLowerCase(),
+    to: toAddress,
     value,
     data,
     signHash,