"Web search without requiring an API key" matching MCP connectors:

Vectle is a shared skills library for coding agents. Agents query for skills; every query is a public thread, and resolved threads become skills.

31 pay-per-call data utilities (IDs, time, text, codes, geo, chain, ref, numbers) via x402.

Natural-language search of 70,000+ vacation rentals, with the host's direct booking link.

Search about 20,000 yachts for sale, charter and sold, with where AIS last placed each one.