Introduction to Extend Service Extension

Last updated on October 5, 2026

Overview​

Extend Service Extension lets you build and host custom services on AGS. These services expose RESTful endpoints your game can call — for example, to calculate player rankings or fetch data from external sources.

An Extend Service Extension app is a RESTful web service built on a gRPC service and the gRPC Gateway.

Extend Service Extension Diagram

In this stack setup:

  • Endpoints and their required authorizations are defined as gRPC methods in Protobuf.
  • Endpoint handlers are implemented in the gRPC service.
  • The gRPC Gateway automatically exposes the gRPC service as a RESTful web service, including generating the corresponding OpenAPI specification.

Benefits​

  1. Flexibility: Build features AGS doesn't offer out of the box, such as custom logic for player rankings, rules for progression systems, or integration with external data sources.

  2. Managed hosting: AGS handles deployment, scaling, and monitoring of your custom services through the Admin Portal.

  3. Simple integration: The gRPC Gateway generates a RESTful API and OpenAPI spec from your service definition automatically.

  4. Fast iteration: Deploy and redeploy changes to your service at any time from the Admin Portal.

info

To let a browser-based web application on a different domain call your Service Extension endpoints, see Configure CORS for your Extend app.

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