402 Index MCP Server

Search 15,000+ paid API endpoints across L402, x402, and MPP protocols with real-time health monitoring.

The 402 Index is the world's largest directory of paid API endpoints for AI agents. This MCP server gives your agent access to search, filter, and evaluate paid APIs before spending money.

Quick Start

npx @402index/mcp-server

Installation

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "402index": {
      "command": "npx",
      "args": ["@402index/mcp-server"]
    }
  }
}

Claude Code

claude mcp add 402index -- npx @402index/mcp-server

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "402index": {
      "command": "npx",
      "args": ["@402index/mcp-server"]
    }
  }
}

Tools

What Can Your Agent Discover?

• L402 (Lightning) — Self-custodial Bitcoin micropayments. 477 endpoints from providers like mutinynet faucet, sats4ai, LightningEnable.
• x402 (Coinbase/Solana) — USDC stablecoin payments on Base/Solana. 14,478 endpoints from Bazaar, Satring, Sponge.
• MPP (Stripe/Tempo) — Fiat-native machine payments. 488 endpoints from OpenAI, Anthropic, Google Gemini, Firecrawl, Replicate.

Every endpoint is health-checked hourly with latency measurements and reliability scoring.

Example Prompts

• "Find healthy L402 APIs for weather data under $0.01"
• "What paid inference APIs are available and which have the best uptime?"
• "Show me all podcast-related paid APIs"
• "Which API categories have the most endpoints?"
• "Get details on the sats4ai image generation endpoint"

Environment Variables

Links

• Website: https://402index.io
• API Docs: https://402index.io/api-docs
• OpenAPI Spec: https://402index.io/api/v1/openapi.json
• llms.txt: https://402index.io/llms.txt
• npm: https://www.npmjs.com/package/@402index/mcp-server

License

MIT