x402 MCP Registry — 53 Pay-per-Call Tools for AI Agents
Free, self-hosted MCP server registry. 53 security and enrichment tools that AI agents pay for via HTTP 402 + USDC on Base mainnet. No API keys, no signup. First call free.
Quick Connect
json { "mcpServers": { "x402-registry": { "type": "sse", "url": "https://etherealgoodsco.store/mcp/sse" } } }
Paste into Claude Desktop, Cursor, or Windsurf. 53 tools auto-discover.
Products
Category | Tools | Price Range |
Security | Contract audit, CVE lookup, URL scan, cert hunt, domain age, email breach, password strength, header audit | $0.01–$0.25 |
Crypto/DeFi | Token snapshot, tx verify, gas oracle, ENS resolve, LP check, deployer history, price feed, top tokens | $0.01–$0.10 |
Enrichment | DNS bundle, IP geo, WHOIS, DNSBL, SSL cert, HTTP status, reverse IP, subdomain scan, port scan, tech stack detect | $0.01–$0.10 |
Bundles | DeFi scan, threat profile, crypto intel, web audit, full diligence | $0.25–$2.00 |
Tools | URL expand, email validate, timezone, language detect, hash ID, base64 codec | $0.01–$0.05 |
How It Works
Agent sends request → Server returns HTTP 402 Payment Required
Agent signs USDC transfer on Base mainnet → CDP facilitator settles
Agent retries with payment proof → Server returns data (200)
Full API docs: https://etherealgoodsco.store/docs
Stack
FastAPI + Coinbase x402 Python SDK
CDP facilitator (EdDSA JWT auth)
Base mainnet (eip155:8453)
Caddy + Let's Encrypt (auto-TLS)
53 MCP tools via SSE transport
Free trial auto-seeding, volume discount ladder, response cache, rate limiter
Discovery
https://etherealgoodsco.store — Registry homepage
https://etherealgoodsco.store/docs — Interactive API docs
https://etherealgoodsco.store/mcp/sse — MCP endpoint
https://etherealgoodsco.store/.well-known/x402.json — x402 discovery
https://etherealgoodsco.store/.well-known/mcp/server-card.json — Server card
</file_contents>
This server cannot be deployed
8 pay-per-call web intel tools over MCP. Free discovery, calls settle in USDC on Base (x402).
Pay-per-call (x402/USDC-Base) web + crypto data tools for AI agents: audit, extract, crypto, DeFi.
17 pay-per-call web, finance, legal and onchain tools for AI agents. USDC on Base via x402/MPP.
Pay-per-call x402 MCP for AI agents: 35 tools, USDC on Base, from $0.001/call, no API keys.