Onyx Mcp

A paid MCP server that charges agents per call in USDC on Base using the x402 protocol. Ships 12 tools including captcha solving, SMS OTP, URL text extraction, DNS lookup, WHOIS, email validation, and IP geolocation. Every call returns HTTP 402 until the agent signs an EIP-3009 USDC authorization, then settles directly to your Base wallet. No API keys, no Stripe, no signup flow. Built on onyx-paid-mcp, a framework that lets you decorate any Python function with a price and automatically gates it behind crypto payment. The reference deployment runs at onyx-actions.onrender.com with tools priced from $0.0003 to $0.25 per call. Useful if you're running infrastructure with real per-call costs and want agents to pay you directly instead of burning through free tier quotas.