D 
data.gov
Data.gov is a U.S. government data portal operated by GSA that publishes dataset metadata and provides access points to government APIs. It also fronts some federal APIs through api.data.gov, including the Regulations.gov API.
data.gov exposes two documented HTTP APIs: the public Data.gov Catalog API and the authenticated Regulations.gov API; no GraphQL, MCP, or CLI surfaces were found.
discovered 1d ago
REST · OpenAPI2
- Regulations.gov APIdiscovered
- Data.gov Catalog APIdiscovered
Credentials
Go to api.data.gov and sign up for an API key. The developer manual says you'll receive a unique 40-character key after signup, and the Data.gov API page says to send it in the x-api-key header on requests. For initial exploration, docs also mention the shared DEMO_KEY, but minting your own key is the normal path.
conventions · 0/8 published
- integrations.json✗
/.well-known/integrations.json - llms.txt✗
/llms.txt - API catalog✗
/.well-known/api-catalog - OpenAPI document✗
/api/schema/, /openapi.json, /swagger.json, /api/openapi.json, or /v1/openapi.json - MCP server card✗
/.well-known/mcp/server-card.json - OAuth protected resource✗
/.well-known/oauth-protected-resource - Agent card✗
/.well-known/agent-card.json - Agent skills✗
/.well-known/agent-skills/index.json
Publish these signals → /publishing