WAHA - WhatsApp HTTP API (REST API) that you can configure in a click! Multiple engines: WEBJS (browser based), NOWEB (websocket nodejs), GOWS (websocket go), WPP (browser)

Enables listing models and running non-streaming chat completions against RelayRouter's OpenAI-compatible API, so agents can discover available models and send chat requests through a key-configured MCP endpoint.

Configure in-product messaging apps. Tools configure apps only; no message bodies or file bytes.