diff --git a/libs/binder/Android.bp b/libs/binder/Android.bp
index b9c8d20..3e8e7c9 100644
--- a/libs/binder/Android.bp
+++ b/libs/binder/Android.bp
@@ -257,6 +257,32 @@
     },
 }
 
+// TODO(b/184872979): remove once the Rust API is created.
+cc_library {
+    name: "libbinder_rpc_unstable",
+    srcs: ["libbinder_rpc_unstable.cpp"],
+    defaults: ["libbinder_ndk_host_user"],
+    shared_libs: [
+        "libbase",
+        "libbinder",
+        "libbinder_ndk",
+        "libutils",
+    ],
+
+    // enumerate stable entry points, for apex use
+    stubs: {
+        symbol_file: "libbinder_rpc_unstable.map.txt",
+    },
+
+    // This library is intentionally limited to these targets, and it will be removed later.
+    // Do not expand the visibility.
+    visibility: [
+        "//packages/modules/Virtualization/authfs:__subpackages__",
+        "//packages/modules/Virtualization/compos",
+        "//packages/modules/Virtualization/microdroid",
+    ],
+}
+
 // libbinder historically contained additional interfaces that provided specific
 // functionality in the platform but have nothing to do with binder itself. These
 // are moved out of libbinder in order to avoid the overhead of their vtables.
diff --git a/libs/binder/libbinder_rpc_unstable.cpp b/libs/binder/libbinder_rpc_unstable.cpp
new file mode 100644
index 0000000..68ec669
--- /dev/null
+++ b/libs/binder/libbinder_rpc_unstable.cpp
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <android/binder_libbinder.h>
+#include <binder/RpcServer.h>
+#include <binder/RpcSession.h>
+
+using android::RpcServer;
+using android::RpcSession;
+
+extern "C" {
+
+bool RunRpcServer(AIBinder* service, unsigned int port) {
+    auto server = RpcServer::make();
+    server->iUnderstandThisCodeIsExperimentalAndIWillNotUseItInProduction();
+    if (!server->setupVsockServer(port)) {
+        LOG(ERROR) << "Failed to set up vsock server with port " << port;
+        return false;
+    }
+    server->setRootObject(AIBinder_toPlatformBinder(service));
+    server->join();
+
+    // Shutdown any open sessions since server failed.
+    (void)server->shutdown();
+    return true;
+}
+
+AIBinder* RpcClient(unsigned int cid, unsigned int port) {
+    auto session = RpcSession::make();
+    if (!session->setupVsockClient(cid, port)) {
+        LOG(ERROR) << "Failed to set up vsock client with CID " << cid << " and port " << port;
+        return nullptr;
+    }
+    return AIBinder_fromPlatformBinder(session->getRootObject());
+}
+}
diff --git a/libs/binder/libbinder_rpc_unstable.map.txt b/libs/binder/libbinder_rpc_unstable.map.txt
new file mode 100644
index 0000000..3921a4d
--- /dev/null
+++ b/libs/binder/libbinder_rpc_unstable.map.txt
@@ -0,0 +1,7 @@
+LIBBINDER_RPC_UNSTABLE_SHIM { # platform-only
+  global:
+    RunRpcServer;
+    RpcClient;
+  local:
+    *;
+};
diff --git a/libs/binder/rust/Android.bp b/libs/binder/rust/Android.bp
index 7d655d8..8d27eed 100644
--- a/libs/binder/rust/Android.bp
+++ b/libs/binder/rust/Android.bp
@@ -106,6 +106,21 @@
     ],
 }
 
+// TODO(b/184872979): remove once the Rust API is created.
+rust_bindgen {
+    name: "libbinder_rpc_unstable_bindgen",
+    wrapper_src: "src/binder_rpc_unstable.hpp",
+    crate_name: "binder_rpc_unstable_bindgen",
+    source_stem: "bindings",
+    shared_libs: [
+        "libutils",
+    ],
+    apex_available: [
+        "com.android.compos",
+        "com.android.virt",
+    ],
+}
+
 rust_test {
     name: "libbinder_rs-internal_test",
     crate_name: "binder",
diff --git a/libs/binder/rust/src/binder_rpc_unstable.hpp b/libs/binder/rust/src/binder_rpc_unstable.hpp
new file mode 100644
index 0000000..7932d0f
--- /dev/null
+++ b/libs/binder/rust/src/binder_rpc_unstable.hpp
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+extern "C" {
+
+struct AIBinder;
+
+bool RunRpcServer(AIBinder* service, unsigned int port);
+AIBinder* RpcClient(unsigned int cid, unsigned int port);
+
+}
diff --git a/libs/binder/rust/src/lib.rs b/libs/binder/rust/src/lib.rs
index 7c0584b..cb330a6 100644
--- a/libs/binder/rust/src/lib.rs
+++ b/libs/binder/rust/src/lib.rs
@@ -119,6 +119,13 @@
 pub use proxy::{AssociateClass, DeathRecipient, Proxy, SpIBinder, WpIBinder};
 pub use state::{ProcessState, ThreadState};
 
+/// Unstable, in-development API that only allowlisted clients are allowed to use.
+pub mod unstable_api {
+    pub use crate::binder::AsNative;
+    pub use crate::proxy::unstable_api::new_spibinder;
+    pub use crate::sys::AIBinder;
+}
+
 /// The public API usable outside AIDL-generated interface crates.
 pub mod public_api {
     pub use super::parcel::ParcelFileDescriptor;
diff --git a/libs/binder/rust/src/proxy.rs b/libs/binder/rust/src/proxy.rs
index 4a6d118..e299963 100644
--- a/libs/binder/rust/src/proxy.rs
+++ b/libs/binder/rust/src/proxy.rs
@@ -125,6 +125,21 @@
     }
 }
 
+pub mod unstable_api {
+    use super::{sys, SpIBinder};
+
+    /// A temporary API to allow the client to create a `SpIBinder` from a `sys::AIBinder`. This is
+    /// needed to bridge RPC binder, which doesn't have Rust API yet.
+    /// TODO(b/184872979): remove once the Rust API is created.
+    ///
+    /// # Safety
+    ///
+    /// See `SpIBinder::from_raw`.
+    pub unsafe fn new_spibinder(ptr: *mut sys::AIBinder) -> Option<SpIBinder> {
+        SpIBinder::from_raw(ptr)
+    }
+}
+
 /// An object that can be associate with an [`InterfaceClass`].
 pub trait AssociateClass {
     /// Check if this object is a valid object for the given interface class