Updated on 2026-08-14

core/datasource/src/main/java/com/tangem/datasource/api/gasless/GaslessTxServiceApiV2.kt

@@ -0,0 +1,21 @@
+package com.tangem.datasource.api.gasless
+
+import com.tangem.datasource.api.common.response.ApiResponse
+import com.tangem.datasource.api.gasless.models.GaslessBatchTransactionRequest
+import com.tangem.datasource.api.gasless.models.GaslessServiceResponse
+import com.tangem.datasource.api.gasless.models.GaslessSignedTransactionResultDTO
+import com.tangem.datasource.api.gasless.models.GaslessTransactionRequest
+import retrofit2.http.Body
+import retrofit2.http.POST
+
+interface GaslessTxServiceApiV2 {
+    @POST("api/v2/transaction/sign")
+    suspend fun signGaslessTransaction(
+        @Body transaction: GaslessTransactionRequest,
+    ): ApiResponse<GaslessServiceResponse<GaslessSignedTransactionResultDTO>>
+
+    @POST("api/v2/transaction/batch-sign")
+    suspend fun signGaslessBatchTransaction(
+        @Body transaction: GaslessBatchTransactionRequest,
+    ): ApiResponse<GaslessServiceResponse<GaslessSignedTransactionResultDTO>>
+}

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

@@ -0,0 +1,41 @@
+package com.tangem.datasource.api.gasless.models
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+/**
+ * Request body for gasless batch transaction submission (v2 `POST /api/v2/transaction/batch-sign`).
+ * Represents a batch of transactions with fee delegation metadata.
+ *
+ * The top-level payload field is `gaslessTransaction` (shared shape with single sign — see
+ * gasless-service `BatchSignRequestDto`), carrying `transactions[]`, `fee`, `nonce`.
+ */
+@JsonClass(generateAdapter = true)
+data class GaslessBatchTransactionRequest(
+    @Json(name = "gaslessTransaction")
+    val gaslessTransaction: GaslessBatchTransactionDataDTO,
+
+    @Json(name = "signature")
+    val signature: String,
+
+    @Json(name = "userAddress")
+    val userAddress: String,
+
+    @Json(name = "chainId")
+    val chainId: Int,
+
+    @Json(name = "eip7702auth")
+    val eip7702Auth: Eip7702AuthorizationDTO? = null,
+)
+
+@JsonClass(generateAdapter = true)
+data class GaslessBatchTransactionDataDTO(
+    @Json(name = "transactions")
+    val transactions: List<TransactionData>,
+
+    @Json(name = "fee")
+    val fee: FeeData,
+
+    @Json(name = "nonce")
+    val nonce: String,
+)

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

@@ -45,6 +45,9 @@ data class TransactionData(
     @Json(name = "value")
     val value: String,
 
+    @Json(name = "gasLimit")
+    val gasLimit: String? = null,
+
     @Json(name = "data")
     val data: String,
 )

core/datasource/src/main/java/com/tangem/datasource/di/NetworkModule.kt

@@ -18,6 +18,7 @@ import com.tangem.datasource.api.news.NewsApi
 import com.tangem.datasource.api.onramp.OnrampApi
 import com.tangem.datasource.api.ethpool.P2PEthPoolApi
 import com.tangem.datasource.api.gasless.GaslessTxServiceApi
+import com.tangem.datasource.api.gasless.GaslessTxServiceApiV2
 import com.tangem.datasource.api.pay.TangemPayApi
 import com.tangem.datasource.api.pay.TangemPayAuthApi
 import com.tangem.datasource.api.stakekit.StakeKitApi
@@ -252,4 +253,20 @@ internal object NetworkModule {
             ),
         )
     }
+
+    @Provides
+    @Singleton
+    fun provideGaslessTxServiceApiV2(retrofitApiBuilder: RetrofitApiBuilder): GaslessTxServiceApiV2 {
+        return retrofitApiBuilder.build(
+            apiConfigId = ApiConfig.ID.GaslessTxService,
+            applyTimeoutAnnotations = false,
+            sessionAuth = false,
+            timeouts = Timeouts(
+                callTimeoutSeconds = TIMEOUT_60_SECONDS,
+                connectTimeoutSeconds = TIMEOUT_60_SECONDS,
+                readTimeoutSeconds = TIMEOUT_60_SECONDS,
+                writeTimeoutSeconds = TIMEOUT_60_SECONDS,
+            ),
+        )
+    }
 }