402 Index FAQs

Question 1

What is 402 Index?

Accepted Answer

The 402 Index is the world's largest directory, listing over 15,000 paid API endpoints across L402, x402, and MPP protocols, specifically designed for AI agents to discover, evaluate, and monitor APIs.

Question 2

How does 402 Index assist AI agents?

Accepted Answer

It enables AI agents to search and filter paid APIs by keywords, protocols, categories, and health status, access full service details, and make informed spending decisions with real-time health data.

Question 3

What payment protocols does 402 Index support?

Accepted Answer

The directory supports L402 (Lightning Bitcoin micropayments), x402 (USDC stablecoin payments on Base/Solana), and MPP (Stripe/Tempo fiat machine payments), covering a broad spectrum of paid services.

Question 4

Does 402 Index provide API health information?

Accepted Answer

Yes, it offers real-time health monitoring, latency measurements, and reliability scoring for all 15,000+ listed endpoints, with hourly updates to ensure accurate and current insights.

Question 5

How can I integrate 402 Index with my AI agent?

Accepted Answer

You can integrate 402 Index as an MCP server using `npx @402index/mcp-server`. Quick start guides are provided for platforms like Claude Desktop, Claude Code, and Cursor to seamlessly add the tools to your agent.

402 Index

Key Features

Use Cases

402 Index

Key Features

Use Cases