diff --git a/jvm-libs/linea/core/client-interface/build.gradle b/jvm-libs/linea/core/client-interface/build.gradle
new file mode 100644
index 000000000..1b9412c59
--- /dev/null
+++ b/jvm-libs/linea/core/client-interface/build.gradle
@@ -0,0 +1,9 @@
+plugins {
+  id 'net.consensys.zkevm.kotlin-library-conventions'
+}
+
+dependencies {
+  implementation(project(':jvm-libs:generic:extensions:kotlin'))
+  implementation(project(':jvm-libs:linea:core:domain-models'))
+  implementation(project(':jvm-libs:generic:errors'))
+}
diff --git a/jvm-libs/linea/core/client-interface/src/main/kotlin/build/linea/clients/Client.kt b/jvm-libs/linea/core/client-interface/src/main/kotlin/build/linea/clients/Client.kt
new file mode 100644
index 000000000..dc0688ee5
--- /dev/null
+++ b/jvm-libs/linea/core/client-interface/src/main/kotlin/build/linea/clients/Client.kt
@@ -0,0 +1,36 @@
+package build.linea.clients
+
+import com.github.michaelbull.result.Err
+import com.github.michaelbull.result.Ok
+import com.github.michaelbull.result.Result
+import net.consensys.linea.errors.ErrorResponse
+import tech.pegasys.teku.infrastructure.async.SafeFuture
+
+/**
+ * Marker interface for error types.
+ * Allow concrete clients to extend this interface to define their own error types.
+ */
+interface ClientError
+
+class ClientException(
+  override val message: String,
+  val errorType: ClientError?
+) :
+  RuntimeException(errorType?.let { "errorType=$it $message" } ?: message)
+
+interface Client<Request, Response> {
+  fun makeRequest(request: Request): Response
+}
+
+interface AsyncClient<Request, Response> {
+  fun makeRequest(request: Request): SafeFuture<Response>
+}
+
+fun <T, E : ClientError> SafeFuture<Result<T, ErrorResponse<E>>>.unwrapResultMonad(): SafeFuture<T> {
+  return this.thenCompose {
+    when (it) {
+      is Ok -> SafeFuture.completedFuture(it.value)
+      is Err -> SafeFuture.failedFuture(ClientException(it.error.message, it.error.type))
+    }
+  }
+}
diff --git a/settings.gradle b/settings.gradle
index 7385b4635..193adcb56 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -11,21 +11,22 @@ include 'jvm-libs:generic:vertx-helper'
 include 'jvm-libs:generic:errors'
 include 'jvm-libs:generic:persistence:db'
 
+include 'jvm-libs:linea:core:client-interface'
 include 'jvm-libs:linea:core:domain-models'
+include 'jvm-libs:linea:core:long-running-service'
 include 'jvm-libs:linea:core:metrics'
 include 'jvm-libs:linea:core:traces'
-include 'jvm-libs:linea:web3j-extensions'
 include 'jvm-libs:linea:blob-compressor'
 include 'jvm-libs:linea:blob-decompressor'
 include 'jvm-libs:linea:blob-shnarf-calculator'
-include 'jvm-libs:linea:core:long-running-service'
 include 'jvm-libs:linea:linea-contracts:l1-rollup'
 include 'jvm-libs:linea:linea-contracts:l2-message-service'
 include 'jvm-libs:linea:metrics:micrometer'
 include 'jvm-libs:linea:teku-execution-client'
+include 'jvm-libs:linea:testing:file-system'
 include 'jvm-libs:linea:testing:l1-blob-and-proof-submission'
 include 'jvm-libs:linea:testing:teku-helper'
-include 'jvm-libs:linea:testing:file-system'
+include 'jvm-libs:linea:web3j-extensions'
 
 include 'coordinator:app'
 include 'coordinator:core'