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.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →
Integrate web data into your AI product. One API to scrape website & brand data.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
x402-mcp
MCP server bringing 100+ x402-paid APIs to AI agents (Claude, Cursor, MCP-aware clients). Auto-discovers tools from CDP Bazaar; handles USDC micropayments on Base.
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 ready via x402 protocol (Base today; Solana, Polygon, BNB, EVM expansion)
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. 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 -> 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
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →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
