Updated on 2026-08-14

domain/express/models/src/main/java/com/tangem/domain/express/models/ExpressAsset.kt

@@ -1,5 +1,6 @@
 package com.tangem.domain.express.models
 
+import com.tangem.domain.models.currency.CryptoCurrency
 import kotlinx.serialization.Serializable
 
 /**
@@ -39,6 +40,13 @@ data class ExpressAsset(
             operator fun invoke(networkId: String, contractAddress: String?): ID {
                 return ID(networkId = networkId, contractAddress = contractAddress ?: EMPTY_CONTRACT_ADDRESS_VALUE)
             }
+
+            operator fun invoke(cryptoCurrency: CryptoCurrency): ID {
+                return ID(
+                    networkId = cryptoCurrency.network.rawId,
+                    contractAddress = (cryptoCurrency as? CryptoCurrency.Token)?.contractAddress,
+                )
+            }
         }
     }
 

domain/express/src/main/java/com/tangem/domain/express/ExpressServiceFetcher.kt

@@ -35,4 +35,6 @@ interface ExpressServiceFetcher {
      * @return A flow emitting Lce states containing either a list of Express assets or an error.
      */
     fun getInitializationStatus(userWalletId: UserWalletId): Flow<Lce<Throwable, List<ExpressAsset>>>
+
+    suspend fun getOrFetch(userWalletId: UserWalletId, assetId: ExpressAsset.ID): Either<Throwable, ExpressAsset>
 }

domain/txhistory/src/main/kotlin/com/tangem/domain/txhistory/repository/TxHistoryRepositoryV2.kt

@@ -23,4 +23,21 @@ interface TxHistoryRepositoryV2 {
         currency: CryptoCurrency,
         fromCreatedAtMillis: Long,
     ): Flow<List<ExpressTx>>
-}
+
+    /**
+     * Reactive express history for [currency] paginated via the unified history index: the [limit] most recent index
+     * rows define the window (their oldest sort time), which bounds [getExpressHistory]. Grow [limit] to load more.
+     *
+     * Used as the standalone backbone when there is no on-chain history source for the currency.
+     */
+    fun getIndexedExpressHistory(
+        userWalletId: UserWalletId,
+        currency: CryptoCurrency,
+        limit: Int,
+    ): Flow<ExpressHistoryPage>
+}
+
+data class ExpressHistoryPage(
+    val items: List<ExpressTx>,
+    val hasMore: Boolean,
+)