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>