"OpenAI Gym" matching MCP connectors:

Find air-quality stations and read pollutant observations from government monitors via OpenAQ v3.

Public ISO 3166-1 record for GM.

OpenAQ MCP — wraps OpenAQ v2 API (free, no auth required)

Tango gives your agent structured, real-time access to the entire federal procurement graph — contracts, opportunities, entities, IDVs, OTAs, protests, subawards, forecasts, budget accounts, vehicles, and GSA eLibrary — behind one auth boundary. No screen-scraping, no stitching together government APIs. Five tools (search, search_opportunities, resolve, get_details, fetch_api_docs) work from Claude, Cursor, the OpenAI Responses API, or any MCP client.