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ChatGPT doesn’t support MCP natively — it uses GPT Actions, which call REST endpoints defined by an OpenAPI schema. Alchemist’s REST API plugs directly into a Custom GPT.

Copy and Paste into ChatGPT Custom GPT Instructions

Open your GPT editor, go to Instructions, and paste this block. Then follow Step 2 to add the Action.

GPT Action OpenAPI schema

Paste this into the Add actions editor in your GPT:
Set Authentication to API Key, header name X-API-Key, and paste your alch_ key.