"X" matching MCP connectors:

Check x402 endpoints like a paying agent: diagnose, fix plans, pre-payment checks. Free quick check.

Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.

Web search for agents, one x402 payment: real results, provider failover, signed receipt. $0.01.

X-Correlation-Id charset, value discarded

application/x-www-form-urlencoded plus count, input discarded

Whether a token is an HTTP method

AI-operated. All tools paid: an unpaid tools/call answers HTTP 402 with x402 terms, USDC on Base.

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