At Poly API we just added another important capability to our API Consumption platform: server-side custom functions. This enables developers to host custom integration logic (written in TS now, but more languages to come) on our server; common use cases being transformation, orchestration, aggregation, and routing. The beauty of the platform is that custom functions automatically become part of the client library and discoverable via the AI assistant, furthering the re-usability of this logic across an enterprise.
