Updated on 2026-08-14

app/src/main/java/com/tangem/tap/di/domain/MnemonicModule.kt

@@ -1,4 +1,4 @@
-package com.tangem.feature.onboarding.data.di
+package com.tangem.tap.di.domain
 
 import android.content.Context
 import com.tangem.crypto.bip39.Wordlist
@@ -14,11 +14,11 @@ import javax.inject.Singleton
 
 @Module
 @InstallIn(SingletonComponent::class)
-class OnboardingDataModule {
+class MnemonicModule {
 
     @Provides
     @Singleton
-    fun provideSeedPhraseSdkRepository(@ApplicationContext context: Context): MnemonicRepository {
+    fun provideMnemonicRepository(@ApplicationContext context: Context): MnemonicRepository {
         return DefaultMnemonicRepository(Wordlist.getWordlist(context))
     }
 }

app/src/main/java/com/tangem/tap/di/domain/WalletManagersFacadeModule.kt

@@ -8,6 +8,7 @@ import com.tangem.datasource.local.userwallet.UserWalletsStore
 import com.tangem.datasource.local.walletmanager.WalletManagersStore
 import com.tangem.domain.walletmanager.DefaultWalletManagersFacade
 import com.tangem.domain.walletmanager.WalletManagersFacade
+import com.tangem.feature.onboarding.data.MnemonicRepository
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
@@ -24,6 +25,7 @@ internal object WalletManagersFacadeModule {
         walletManagersStore: WalletManagersStore,
         userWalletsStore: UserWalletsStore,
         configManager: ConfigManager,
+        mnemonicRepository: MnemonicRepository,
         assetReader: AssetReader,
         @SdkMoshi moshi: Moshi,
     ): WalletManagersFacade {
@@ -33,6 +35,7 @@ internal object WalletManagersFacadeModule {
             configManager = configManager,
             assetReader = assetReader,
             moshi = moshi,
+            mnemonic = mnemonicRepository.generateDefaultMnemonic(),
         )
     }
 }

app/src/main/java/com/tangem/tap/features/demo/DemoTransactionSender.kt

@@ -21,7 +21,7 @@ class DemoTransactionSender(private val walletManager: WalletManager) : Transact
         )
     }
 
-    override suspend fun estimateFee(amount: Amount): Result<TransactionFee> {
+    override suspend fun estimateFee(amount: Amount, destination: String): Result<TransactionFee> {
         return getFee(amount, walletManager.wallet.address)
     }
 

domain/legacy/src/main/java/com/tangem/domain/walletmanager/DefaultWalletManagersFacade.kt

@@ -10,11 +10,13 @@ import com.tangem.blockchain.blockchains.solana.RentProvider
 import com.tangem.blockchain.common.*
 import com.tangem.blockchain.common.address.Address
 import com.tangem.blockchain.common.address.AddressType
+import com.tangem.blockchain.common.address.EstimationFeeAddressFactory
 import com.tangem.blockchain.common.transaction.Fee
 import com.tangem.blockchain.common.transaction.TransactionFee
 import com.tangem.blockchain.common.txhistory.TransactionHistoryRequest
 import com.tangem.blockchain.extensions.Result
 import com.tangem.blockchain.extensions.SimpleResult
+import com.tangem.crypto.bip39.Mnemonic
 import com.tangem.crypto.hdWallet.DerivationPath
 import com.tangem.datasource.asset.AssetReader
 import com.tangem.datasource.config.ConfigManager
@@ -45,6 +47,7 @@ class DefaultWalletManagersFacade(
     private val walletManagersStore: WalletManagersStore,
     private val userWalletsStore: UserWalletsStore,
     configManager: ConfigManager,
+    mnemonic: Mnemonic,
     assetReader: AssetReader,
     moshi: Moshi,
 ) : WalletManagersFacade {
@@ -55,6 +58,7 @@ class DefaultWalletManagersFacade(
     private val sdkTokenConverter by lazy { SdkTokenConverter() }
     private val txHistoryStateConverter by lazy { SdkTransactionHistoryStateConverter() }
     private val txHistoryItemConverter by lazy { SdkTransactionHistoryItemConverter(assetReader, moshi) }
+    private val estimationFeeAddressFactory by lazy { EstimationFeeAddressFactory(mnemonic) }
 
     override suspend fun update(
         userWalletId: UserWalletId,
@@ -444,7 +448,13 @@ class DefaultWalletManagersFacade(
             blockchain = blockchain,
             derivationPath = network.derivationPath.value,
         )
-        return (walletManager as? TransactionSender)?.estimateFee(amount = amount)
+
+        val destination = estimationFeeAddressFactory.makeAddress(blockchain)
+
+        return (walletManager as? TransactionSender)?.estimateFee(
+            amount = amount,
+            destination = destination,
+        )
     }
 
     override suspend fun validateTransaction(

features/onboarding/src/main/java/com/tangem/feature/onboarding/data/DefaultMnemonicRepository.kt

@@ -8,7 +8,7 @@ import com.tangem.crypto.bip39.Wordlist
 /**
 [REDACTED_AUTHOR]
  */
-internal class DefaultMnemonicRepository(
+class DefaultMnemonicRepository(
     private val bip39Wordlist: Wordlist,
 ) : MnemonicRepository {