# x402scan

> x402scan is the ecosystem explorer and registry for x402, an open standard for internet-native payments where API resources are purchased just-in-time with stablecoins (USDC) — no accounts, no API keys, no subscriptions. It indexes x402 servers, transactions, buyers, merchants, and facilitators across Base and Solana, and exposes that data through a public API and an MCP server for agents.

x402 lets AI agents and applications pay for API resources on demand over HTTP 402. x402scan makes the ecosystem observable: it tracks payment volume, ranks buyers and merchants, catalogs discoverable resources, and lets you register your own x402 endpoints so agents can find and pay for them.

## Explore
- [Overview](https://www.x402scan.com/): live x402 transaction volume, top buyers, merchants, and facilitators
- [What is x402](https://www.x402scan.com/x402): explainer for the x402 payment standard
- [Agentic commerce](https://www.x402scan.com/agentic-commerce): how agents transact over x402
- [Resources](https://www.x402scan.com/resources): indexed x402 API resources you can call
- [Facilitators](https://www.x402scan.com/facilitators): x402 facilitators and their stats
- [Networks](https://www.x402scan.com/networks): activity broken down by chain (Base, Solana)

## For agents and developers
- [OpenAPI specification](https://www.x402scan.com/openapi.json): machine-readable spec for the x402scan public API (/api/x402)
- [API catalog](https://www.x402scan.com/.well-known/api-catalog): RFC 9727 catalog linking the spec, docs, and health endpoint
- [API health](https://www.x402scan.com/api/health): liveness endpoint
- [MCP server](https://www.x402scan.com/mcp): install the x402scan MCP server (npm `@x402scan/mcp`) to call x402 APIs with automatic payment handling
- [MCP guide](https://www.x402scan.com/mcp/guide): using the MCP server for agentic workflows
- [Register a resource](https://www.x402scan.com/resources/register): add your x402 endpoint to the registry

The public API mixes paid and free endpoints: most read endpoints require a small x402 micropayment (~$0.01–$0.02, sent via an `X-Payment` header); registry write endpoints use SIWX wallet authentication and are free. See the OpenAPI spec for the full endpoint list and input schemas.

## Documentation
- [Discovery guide](https://www.x402scan.com/discovery): make your x402 server discoverable by agents
- [Discovery spec (Markdown)](https://www.x402scan.com/discovery/spec.md): the integration and discovery contract
- [Architecture (Markdown)](https://www.x402scan.com/discovery/architecture.md): how discovery works end to end
- [GitHub repository](https://github.com/Merit-Systems/x402scan): source code and README

## Optional
- [Privacy policy (Markdown)](https://www.x402scan.com/privacy.md)
- [Terms of service (Markdown)](https://www.x402scan.com/tos.md)