OpenAI Responses API

The OpenAI Responses API can call Alchemist server-side via its hosted mcp tool — OpenAI’s infrastructure connects to the endpoint on the model’s behalf, so there’s nothing to run in your own process. Pass your API key in the authorization field. Get a key at app.askalchemist.com/settings/api-keys.

{
  "model": "<your-model>",
  "tools": [
    {
      "type": "mcp",
      "server_label": "alchemist",
      "server_url": "https://api.askalchemist.com/mcp/",
      "authorization": "alch_YOUR_KEY",
      "require_approval": "never"
    }
  ],
  "input": "Did the March 2026 FOMC minutes signal a rate pause?"
}

OpenAI forwards authorization as the Authorization header and does not store it — send it on each request. Optional fields: allowed_tools (restrict which tools are exposed) and require_approval ("never" | "always" | per-tool object).

The Responses API expects a token you already hold — it doesn’t run the OAuth 2.0 + Dynamic Client Registration flow for you. The static API key is the clean fit here.

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MCP Reference

API Reference

OpenAI Responses API