"Google BigQuery cloud data warehouse service" matching MCP connectors:

Create hosted mock REST APIs as tools: seed fake data, import specs, query, write, snapshot. Free.

Verify x402 endpoints before payment or publish service profiles for agent discovery.

DummyJSON mock REST: products, users, posts, recipes, todos. Keyless test data.

20+ pay-per-use APIs: image gen, crypto data, email verify, SSL check, web scraping, and more.