# Merit Systems Developer Resources

Explore Merit Systems products and their published resources. API references, agent instructions, and discovery documents are linked where available. If you are an AI agent, start with the OpenAPI spec or MCP server for the product you need.

Every page on merit.systems is also available as Markdown: send `Accept: text/markdown` or append `.md` to any URL.

## [x402scan](https://x402scan.com)

Explorer and registry for x402, the HTTP 402 micropayment standard. Indexes every server, transaction, buyer, and facilitator on Base and Solana, and exposes it through a public API and an MCP server.

- [x402scan OpenAPI specification](https://www.x402scan.com/openapi.json)
- [x402scan API catalog (RFC 9727)](https://www.x402scan.com/.well-known/api-catalog)
- [x402scan MCP server](https://www.x402scan.com/mcp)
- [x402scan MCP guide](https://www.x402scan.com/mcp/guide)
- [x402 discovery spec (Markdown)](https://www.x402scan.com/discovery/spec.md)
- [Register an x402 resource](https://www.x402scan.com/resources/register)
- [x402scan llms.txt](https://www.x402scan.com/llms.txt)
- [x402scan source on GitHub](https://github.com/Merit-Systems/x402scan)

## [MPPscan](https://mppscan.com)

Explorer and registry for the Machine Payments Protocol on Tempo, built with Stripe and Tempo. Tracks volume and registered services, and lets you list an endpoint so agents can find and pay for it.

- [MPPscan OpenAPI specification](https://mppscan.com/openapi.json)
- [MPPscan API catalog (RFC 9727)](https://mppscan.com/.well-known/api-catalog)
- [Make your API agent-payable (Markdown)](https://mppscan.com/merchants.md)
- [MPP discovery spec (Markdown)](https://mppscan.com/discovery/spec.md)
- [Register an MPP service](https://mppscan.com/register)
- [MPPscan llms.txt](https://mppscan.com/llms.txt)
- [MPPscan source on GitHub](https://github.com/Merit-Systems/mppscan)

## [AgentCash](https://agentcash.dev)

A wallet and MCP server that pays for any x402 or MPP API per call. Fund one USDC balance, install it in Claude, Cursor, or Codex, and the agent pays as it goes with no API keys.

- [AgentCash documentation](https://agentcash.dev/docs)
- [AgentCash docs for LLMs (full text)](https://agentcash.dev/docs/llms-full.txt)
- [AgentCash install guide](https://agentcash.dev/install)
- [AgentCash agent skill descriptor](https://agentcash.dev/skill.md)
- [AgentCash OpenAPI catalog](https://agentcash.dev/openapi.json)
- [AgentCash merchant integration guide](https://agentcash.dev/merchants.md)
- [AgentCash llms.txt](https://agentcash.dev/llms.txt)

## [Poncho](https://poncho.merit.systems)

A desktop agent for people who never open a terminal, with payments and thousands of paid tools built in. Ask for a deck, a report, or a lead list and it buys what it needs to finish.

- [Poncho OpenAPI specification](https://tryponcho.com/openapi.json)
- [Poncho llms.txt](https://tryponcho.com/llms.txt)

## [OpenInstinct](https://openinstinct.sh)

An open source assistant that lives in your iMessage thread and works real websites in a browser: groceries, tickets, forms, renewals. Your passwords and cards stay encrypted in your own Vercel account, and it asks before it spends.

- [OpenInstinct](https://openinstinct.sh)

## [Theo](https://asktheo.nyc)

A personal guide to New York City over text, with recommendations for restaurants, date spots, and nights out.

- [Theo website](https://asktheo.nyc)

## Merit Systems

- [Merit Systems on GitHub](https://github.com/Merit-Systems)
- [Merit Systems llms.txt](https://merit.systems/llms.txt)
- [Merit Systems sitemap](https://merit.systems/sitemap.xml)
- [Merit Systems glossary (x402, MPP, agentic commerce)](https://merit.systems/glossary)

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