"author:makar52nn-crypto" matching MCP servers:

Enables AI agents and bots to buy per-call data and intelligence — token safety verdicts, prices, news, weather, web-to-text, and research dossiers — without signup or API keys, since each call is authenticated by an on-chain USDC payment on Base via the x402 protocol. Clients hit any paid endpoint, receive an HTTP 402 challenge, sign an EIP-3009 transfer authorization, and retry to get the data.