Summary
Connects Claude to 100+ paid APIs through the x402 protocol and Coinbase's CDP Bazaar, handling USDC micropayments on Base automatically. The server auto-discovers available endpoints every five minutes, so new APIs appear without restarts. Each tool call costs between $0.0001 and $0.10 in USDC, paid via EIP-3009 signatures with no gas fees for the caller. You configure it with a Base wallet private key and optional price caps. Reach for this when you need Claude to access paid data services or APIs that use HTTP 402 payment gates, especially if you want the toolset to grow dynamically as new providers join the Bazaar.
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one prompt install →x402-mcp
MCP server bringing hundreds of x402-paid APIs to AI agents (Claude, Cursor, MCP-aware clients). Auto-discovers tools from CDP Bazaar; handles USDC micropayments on Base + Solana.
Features
- Auto-discovers x402 endpoints from CDP Bazaar (no hard-coded list)
- Reads metadata directly from Bazaar (description, schema, pricing)
- Refreshes every 5 min — new endpoints appear without restart
- Handles HTTP 402 + USDC payment automatically
- Multi-chain: Base + Solana mainnet live (USDC on both); Polygon/BNB/EVM expandable
Install (Claude Desktop)
Add to claude_desktop_config.json:
{
"mcpServers": {
"x402-mcp": {
"command": "npx",
"args": ["-y", "x402node-mcp"],
"env": { "X402_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY" }
}
}
}
Set X402_PRIVATE_KEY to a Base EOA private key (hex, 0x-prefixed) with USDC on Base mainnet (Solana payment via SPL USDC also supported). Restart Claude Desktop. The server auto-discovers ~117 tools on first run.
Cost Safety
- Each tool call costs $0.0001-$0.10 USDC depending on endpoint
- Hard cap:
MAX_PRICE_USDenv var (default $0.10/call); calls above are blocked - Use a fresh burner wallet, not your main wallet
How it works
Agent calls tool -> HTTP 402 -> x402-fetch signs EIP-3009 -> CDP Facilitator settles on Base or Solana -> response returned. Buyer pays no gas.
Development
git clone https://github.com/x402node/x402-mcp
cd x402-mcp
npm install
cp .env.example .env # edit X402_PRIVATE_KEY
node mcp-server.js
Links
- x402 protocol: https://x402.org
- CDP Bazaar: https://docs.cdp.coinbase.com/x402/bazaar
- MCP: https://modelcontextprotocol.io
- npm: https://www.npmjs.com/package/x402node-mcp
- Glama: https://glama.ai/mcp/servers/x402node/x402-mcp
License
MIT
Featured
Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Configuration
X402_PRIVATE_KEY*secretBase EOA private key (hex, 0x-prefixed) with USDC for signing x402 payments
Categories
Registryactive
Packagex402node-mcp
TransportSTDIO
AuthRequired
UpdatedMay 27, 2026
