# MPPScan

> MPPScan is the ecosystem explorer and registry for MPP (Machine Payments Protocol), an open standard for agent-native payments on the Tempo blockchain where API resources are paid for just-in-time with stablecoins — no accounts, no API keys, no subscriptions. It indexes MPP services, transactions, volume, and protocol stats, and exposes that data through a public API for agents.

MPP lets AI agents and applications pay for API resources on demand. MPPScan makes the ecosystem observable: it tracks protocol-wide volume, registered services and their resources, participant activity, and lets you register your own MPP endpoints so agents can discover and pay for them.

## Explore
- [Overview](https://mppscan.com/): live MPP protocol stats, registered services, and volume
- [Activity](https://mppscan.com/activity): recent MPP transactions across services
- [Skills](https://mppscan.com/skills): installable agent skills for MPP-powered APIs
- [Register a service](https://mppscan.com/register): add your MPP endpoint to the registry

## For agents and developers
- [OpenAPI specification](https://mppscan.com/openapi.json): machine-readable spec for the MPPScan public API (/api/mpp)
- [API catalog](https://mppscan.com/.well-known/api-catalog): RFC 9727 catalog linking the spec, docs, and health endpoint
- [API health](https://mppscan.com/api/health): liveness endpoint
- [Make your API agent-payable](https://mppscan.com/merchants.md): guide for making an API discoverable, payable, and wallet-authorized for agents (MPP and x402)

The public API offers read-only access to indexed MPP data (services, activity, protocol stats) and a semantic search endpoint (`POST /api/mpp/search`) that maps natural-language intent to matching service domains. Registry write endpoints use SIWX wallet authentication. See the OpenAPI spec for the full endpoint list and input schemas.

## Documentation
- [Discovery guide](https://mppscan.com/discovery): make your MPP service discoverable by agents
- [Quickstart](https://mppscan.com/discovery/quickstart): get discoverable quickly
- [Discovery spec (Markdown)](https://mppscan.com/discovery/spec.md): the integration and discovery contract
- [Architecture (Markdown)](https://mppscan.com/discovery/architecture.md): how discovery works end to end
- [GitHub repository](https://github.com/Merit-Systems/mppscan): source code and README