diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 9d601cace..6c0655af9 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -64,6 +64,12 @@ protobuf = "4.35.1"
 protobuf-plugin = "0.10.0"
 protovalidate-kt = "0.1.1"
 
+# Generated client SDKs for the two backend contracts. Separate versions on purpose: the
+# protos are independent (flipcash2 does not import ocp), so the packages move on their own
+# cadence and there is nothing to keep aligned.
+ocp-client-protocol = "0.1.0"
+flipcash2-client-protocol = "0.1.0"
+
 # The Android port is the ONLY libphonenumber this app depends on, deliberately. Google's
 # `com.googlecode` artifact used to sit alongside it; the two ship separate copies of the metadata,
 # so any version skew between them meant they could disagree on whether a number is valid — and the
@@ -215,6 +221,8 @@ grpc-protobuf-lite = { module = "io.grpc:grpc-protobuf-lite", version.ref = "grp
 grpc-stub = { module = "io.grpc:grpc-stub", version.ref = "grpc" }
 protobuf-kotlin-lite = { module = "com.google.protobuf:protobuf-kotlin-lite", version.ref = "protobuf" }
 protobuf-validate-runtime = { module = "dev.bmcreations:protovalidate-runtime", version.ref = "protovalidate-kt" }
+ocp-client-protocol = { module = "com.flipcash:ocp-client-protocol", version.ref = "ocp-client-protocol" }
+flipcash2-client-protocol = { module = "com.flipcash:flipcash2-client-protocol", version.ref = "flipcash2-client-protocol" }
 
 # Retrofit
 retrofit = { module = "com.squareup.retrofit2:retrofit", version.ref = "retrofit" }
diff --git a/services/flipcash/build.gradle.kts b/services/flipcash/build.gradle.kts
index 50199a10c..e8fc17062 100644
--- a/services/flipcash/build.gradle.kts
+++ b/services/flipcash/build.gradle.kts
@@ -24,7 +24,7 @@ android {
 }
 
 dependencies {
-    implementation(project(":definitions:flipcash:models"))
+    implementation(libs.flipcash2.client.protocol)
     api(project(":libs:network:jwt"))
     api(project(":services:opencode"))
     implementation(project(":ui:resources"))
diff --git a/services/opencode/build.gradle.kts b/services/opencode/build.gradle.kts
index e0eba2380..a7f5334f2 100644
--- a/services/opencode/build.gradle.kts
+++ b/services/opencode/build.gradle.kts
@@ -27,7 +27,7 @@ android {
 }
 
 dependencies {
-    implementation(project(":definitions:opencode:models"))
+    implementation(libs.ocp.client.protocol)
     api(project(":libs:currency-math"))
     api(project(":libs:datetime"))
     api(project(":libs:encryption:base58"))