Updated on 2026-08-14

core/datasource/src/main/java/com/tangem/datasource/api/gasless/models/GaslessTransactionRequest.kt

@@ -65,6 +65,9 @@ data class FeeData(
 
     @Json(name = "baseGas")
     val baseGas: String,
+
+    @Json(name = "feeReceiver")
+    val feeReceiver: String,
 )
 
 /**

data/transaction/src/main/java/com/tangem/data/transaction/DefaultGaslessTransactionRepository.kt

@@ -32,6 +32,7 @@ class DefaultGaslessTransactionRepository(
     private val supportedTokensState = MutableStateFlow<Map<Network.ID, Set<CryptoCurrency>>>(hashMapOf())
     private val allFeeRecipientAddress = mutableSetOf<String>()
     private val addressesMutex = Mutex()
+    private var feeReceiverAddress: String? = null
 
     private val gaslessTransactionRequestBuilder = GaslessTransactionRequestBuilder()
     private val signedTransactionResultConverter = GaslessSignedTransactionResultConverter()
@@ -77,11 +78,18 @@ class DefaultGaslessTransactionRepository(
 
     override suspend fun getTokenFeeReceiverAddress(): String {
         return withContext(coroutineDispatcherProvider.io) {
-            val response = gaslessTxServiceApi.getFeeRecipient().getOrThrow()
-            if (response.isSuccess) {
-                response.result.address
-            } else {
-                error("Gasless service returned unsuccessful response")
+            addressesMutex.withLock {
+                val feeReceiver = feeReceiverAddress
+                if (feeReceiver != null) {
+                    return@withContext feeReceiver
+                }
+                val response = gaslessTxServiceApi.getFeeRecipient().getOrThrow()
+                if (response.isSuccess) {
+                    feeReceiverAddress = response.result.address
+                    response.result.address
+                } else {
+                    error("Gasless service returned unsuccessful response")
+                }
             }
         }
     }

data/transaction/src/main/java/com/tangem/data/transaction/convertes/GaslessTxDataToGaslessRequestConverter.kt

@@ -39,6 +39,7 @@ class GaslessTxDataToGaslessRequestConverter : Converter<GaslessTransactionData,
             coinPriceInToken = fee.coinPriceInToken.toString(),
             feeTransferGasLimit = fee.feeTransferGasLimit.toString(),
             baseGas = fee.baseGas.toString(),
+            feeReceiver = fee.feeReceiver,
         )
     }
 }

domain/transaction/src/main/java/com/tangem/domain/transaction/models/GaslessTransactionData.kt

@@ -56,6 +56,7 @@ data class GaslessTransactionData(
      * @property coinPriceInToken price of native coin in fee token units
      * @property feeTransferGasLimit gas limit for fee token transfer
      * @property baseGas base gas cost (currently constant BASE_GAS, may vary in future)
+     * @property feeReceiver address receiving the fee payment
      */
     data class Fee(
         val feeToken: String,
@@ -63,5 +64,6 @@ data class GaslessTransactionData(
         val coinPriceInToken: BigInteger,
         val feeTransferGasLimit: BigInteger,
         val baseGas: BigInteger,
+        val feeReceiver: String,
     )
 }

domain/transaction/src/main/java/com/tangem/domain/transaction/usecase/gasless/CreateAndSendGaslessTransactionUseCase.kt

@@ -241,7 +241,7 @@ class CreateAndSendGaslessTransactionUseCase(
         }
     }
 
-    private fun createGaslessTransactionData(
+    private suspend fun createGaslessTransactionData(
         transactionData: TransactionData.Uncompiled,
         txFee: TransactionFeeExtended,
         tokenFeeStatus: CryptoCurrencyStatus,
@@ -272,7 +272,7 @@ class CreateAndSendGaslessTransactionUseCase(
         )
     }
 
-    private fun buildFee(
+    private suspend fun buildFee(
         txFee: TransactionFeeExtended,
         tokenFeeStatus: CryptoCurrencyStatus,
     ): GaslessTransactionData.Fee {
@@ -288,6 +288,7 @@ class CreateAndSendGaslessTransactionUseCase(
             coinPriceInToken = feeInTokenCurrency.coinPriceInToken,
             feeTransferGasLimit = feeInTokenCurrency.feeTransferGasLimit,
             baseGas = feeInTokenCurrency.baseGas,
+            feeReceiver = gaslessTransactionRepository.getTokenFeeReceiverAddress(),
         )
     }
 

domain/transaction/src/main/java/com/tangem/domain/transaction/usecase/gasless/Eip712TypedDataBuilder.kt

@@ -69,6 +69,7 @@ object Eip712TypedDataBuilder {
                 put(typeProperty("coinPriceInToken", "uint256"))
                 put(typeProperty("feeTransferGasLimit", "uint256"))
                 put(typeProperty("baseGas", "uint256"))
+                put(typeProperty("feeReceiver", "address"))
             })
             put("GaslessTransaction", JSONArray().apply {
                 put(typeProperty("transaction", "Transaction"))
@@ -117,6 +118,7 @@ object Eip712TypedDataBuilder {
                 put("coinPriceInToken", gaslessTransaction.fee.coinPriceInToken.toString())
                 put("feeTransferGasLimit", gaslessTransaction.fee.feeTransferGasLimit.toString())
                 put("baseGas", gaslessTransaction.fee.baseGas.toString())
+                put("feeReceiver", gaslessTransaction.fee.feeReceiver)
             })
             put("nonce", gaslessTransaction.nonce.toString())
         }

gradle/tangem_dependencies.toml

@@ -5,7 +5,7 @@
 # https://github.com/tangem/tangem-sdk-android/
 # https://github.com/tangem/vico
 
-tangemBlockchainSdk = "develop-1387"
+tangemBlockchainSdk = "develop-1391"
 #tangemBlockchainSdk = "0.0.1" # Keep it! - used for local builds
 tangemCardSdk = "develop-573"
 #tangemCardSdk = "0.0.1" # Keep it! - used for local builds ^