# X402Rank

> Small x402 directory. Humans browse listings; agents call POST /api/mcp.
> **This is a candidate queue.** Placement is not rank. /pricing is inquire + USDC.

## Product
- [Home](https://x402rank.xyz/)
- [Listings](https://x402rank.xyz/leaderboard)
- [Inquire](https://x402rank.xyz/pricing) — invoice + USDC only
- [Submit](https://x402rank.xyz/submit)
- [How we list](https://x402rank.xyz/rank)

## For autonomous agents
- [Developers / Agents](https://x402rank.xyz/developers)
- [MCP + x402 API contract](https://x402rank.xyz/api/openapi.json)
- Endpoint: POST https://x402rank.xyz/api/mcp
- Modes: search | leaderboard | builder_profile | category | premium
- Premium: requires x402 payment metadata; 402 returns tier, quotaRemaining, upgradeUrl
- Idempotency: idempotencyKey in body or x-idempotency-key header; replay returns 409
- Rankings JSON: GET https://x402rank.xyz/api/rankings

## When to use / When not
- Use this site to discover x402 builders we have listed, and to query the same list via POST /api/mcp.
- Use GET /api/rankings for a verification-first snapshot. Earnings stay locked until we count USDC to a project's 402 payTo.
- Do not use this site as a volume explorer clone or as an unverified earnings rank. Copied dashboard numbers are not public rank.
- **Placement is not rank.** We do not sell position. Listings are a candidate queue.

## Policies
- [Terms](https://x402rank.xyz/terms)
- [Privacy](https://x402rank.xyz/privacy)
- [Disclaimer](https://x402rank.xyz/disclaimer)

## Optional
- [llms-full.txt](https://x402rank.xyz/llms-full.txt) — extended examples and rate limits