Updated on 2026-08-14

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

@@ -16,6 +16,8 @@ import com.tangem.domain.transaction.models.GaslessTransactionData
 import com.tangem.utils.coroutines.CoroutineDispatcherProvider
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
 import java.math.BigInteger
 
@@ -26,6 +28,8 @@ class DefaultGaslessTransactionRepository(
 ) : GaslessTransactionRepository {
 
     private val supportedTokensState = MutableStateFlow<Map<Network.ID, Set<CryptoCurrency>>>(hashMapOf())
+    private val allFeeRecipientAddress = mutableSetOf<String>()
+    private val addressesMutex = Mutex()
 
     private val gaslessTransactionRequestBuilder = GaslessTransactionRequestBuilder()
     private val signedTransactionResultConverter = GaslessSignedTransactionResultConverter()
@@ -115,6 +119,21 @@ class DefaultGaslessTransactionRepository(
         return networkBlockchain.getChainId() ?: error("ChainId not found for blockchain ${networkBlockchain.name}")
     }
 
+    override suspend fun getGaslessFeeAddresses(): Set<String> {
+        return addressesMutex.withLock {
+            allFeeRecipientAddress.ifEmpty {
+                val allFeeAddresses = getAllFeeRecipientAddresses()
+                allFeeRecipientAddress.addAll(allFeeAddresses)
+                allFeeRecipientAddress
+            }
+        }
+    }
+
+    private suspend fun getAllFeeRecipientAddresses(): Set<String> {
+        // TODO Replace with other backend call to get all fee recipient addresses when available
+        return setOf(getTokenFeeReceiverAddress())
+    }
+
     private companion object {
         val BASE_GAS_FOR_TRANSACTION: BigInteger = BigInteger("100000")
     }

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

@@ -34,6 +34,10 @@ class MockedGaslessTransactionRepository(
         return networkBlockchain.getChainId() ?: error("ChainId not found for blockchain ${networkBlockchain.name}")
     }
 
+    override suspend fun getGaslessFeeAddresses(): Set<String> {
+        return setOf("0x2bD8AA05a92CcDaeDE5d42EB7D196ed07F8F8EF3")
+    }
+
     override suspend fun getTokenFeeReceiverAddress(): String {
         return TOKEN_RECEIVER_ADDRESS
     }