Contract-first REST for builders and agents. Same control plane as Fat Heron products — documented here for the developer surface.
Grok's browse tool will not send X-API-Key. Use a Custom MCP connector instead. Grok's runtime calls Fat Heron tools. Do not paste a key into the chat.
Go to grok.com/connectors. New Connector → Custom.
https://api.fatheron.dev/mcp
Complete OAuth on auth.fatheron.com when Grok asks. That is the Fat Heron account — no key in the prompt. If the connector form accepts a header instead, use X-API-Key with a domainer_full or developer_full key (never paste that key into the chat).
In a new Grok chat, after the connector is connected:
assign a lander template on travelingdom.com
Grok should call list_portfolio_domains, then create_lander / assign_lander. This is an API assign, not a website deploy.