boo-x402-mcp

One MCP server giving AI agents pay-per-call access to crypto/web3 ground-truth data across 5 chains: Ethereum, BNB Chain, Base, Solana, and Robinhood Chain (chain_id 4663).

Paid in USDC on Base via x402. No API key. No signup. No subscription. Built-in spend caps.

Why

Agents cannot sign up for API keys. x402 lets your agent pay per call with a signature. This server wraps a fleet of data APIs behind one install, routes each question to the right backend, and enforces a spending limit before the wallet ever signs.

Related MCP server: hyperd-mcp

Tools (34 paid + 2 free)

Call x402_list_paid_tools (FREE) first to see everything with live prices.

Safety (use before you buy)

Meme tokens

Token data

Market & DeFi

Prediction markets

Robinhood Chain (new L2, not covered by other providers)

Free: x402_list_paid_tools, x402_spend_status

Install

{
  "mcpServers": {
    "boo-x402": {
      "command": "npx",
      "args": ["-y", "boo-x402-mcp"],
      "env": {
        "WALLET_PRIVATE_KEY": "0x...",
        "MAX_USD_PER_CALL": "0.05",
        "MAX_USD_TOTAL": "5"
      }
    }
  }
}

Works with Claude Desktop, Claude Code (claude mcp add), Cursor, and any MCP client.

Wallet

You need a wallet holding USDC on Base. No ETH needed for gas: x402 uses EIP-3009, so your wallet only signs, and the facilitator pays gas.

Your private key stays on your machine, in your MCP config. It is never transmitted. Payments are signed locally, per call.

The free tools work with no wallet at all.

Spend caps

x402 wallets are unlimited by default. This server is not:

• MAX_USD_PER_CALL (default 0.05) - rejects any single payment above this, before signing

• MAX_USD_TOTAL (default 5) - rejects further calls once session spend reaches this

Restart the server to reset the session total.

Data

Public, verifiable sources (Blockscout, RPC, DEX pairs, DefiLlama, GoPlus). Read-only.

NOT investment advice.

License

MIT