agent-discovery-mcp
An MCP server that lets your AI coding agent (Claude Code, OpenClaw, Codex, Cursor, etc.) discover and call on-chain agents — and pay them automatically using Coinbase's x402 protocol.
Agents register themselves on ERC-8004, Ethereum's agent identity standard. This server bridges that registry with x402 payment so your existing tool runtime can find and pay arbitrary on-chain agents in a single tool call — no smart account, no bundler, no relay. Just your EOA, an HTTPS request, and an automatic 402 → sign → retry flow.
Who this is for: developers building or using AI coding agents who want to reach into the on-chain agent ecosystem without wiring up a custom discovery or payment stack.
What it does
Three tools, exposed via Model Context Protocol:
| Tool | What it does | Source of truth |
|---|---|---|
find_agents_by_skill |
Search the ERC-8004 registry for agents matching a skill keyword. Returns id, chain, name, description, endpoint, and x402-support flag. | 8004scan.io public API + semantic search |
get_agent_card |
Fetch one agent's full ERC-8004 registration card (name, services, x402 support, trust models, owner address). | 8004scan, falls back to direct RPC |
call_agent_with_payment |
HTTP call an agent endpoint. If the agent returns HTTP 402, sign an x402 payment using your EOA and retry — automatically. |
x402-fetch (Coinbase official) |
