GTM Index (gtmindex.io)

GTM Index developer resources

Public, no-key surfaces for agents and integrators that need GTM Index (gtmindex.io): Open WebMCP, the people/jobs Gateway, and OpenAPI. This is not a write API and not a webhook hub.

GTM Index APIs and machine files

• GTM Index API — people/jobs Gateway and WebMCP HTTP.
• GTM Index MCP server — POST /mcp, no key.
• GTM Index public browse — no API key.
• openapi.json — OpenAPI 3.1 for GTM Index.
• /.well-known/api-catalog — RFC 9727 catalog.
• llms.txt — when to use GTM Index.
• agent-instructions.md — call guidance.
• API versioning and deprecation — /v1, Sunset.
• GET /v1/people and GET /v1/jobs — same-origin list APIs, RFC 9457 errors.