Merit Systems Developer Resources
Everything you need to build on, or sell to, the agentic economy with Merit Systems products. Each product publishes its own machine-readable API reference, agent instructions and discovery documents at the URLs below. 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
Ecosystem explorer and registry for x402, the HTTP 402 micropayment standard. Indexes x402 servers, transactions, buyers, merchants and facilitators across Base and Solana, and exposes that data through a public API and an MCP server.
MPPscan
Ecosystem explorer and registry for MPP (Machine Payments Protocol), the agent-native payment standard on Tempo. Tracks protocol volume, registered services and resources, and lets you register MPP endpoints so agents can discover and pay for them.
AgentCash
MCP server and wallet that lets AI agents call payment-protected APIs with x402 micropayments. Fund one USDC balance, install the MCP server in Claude, Cursor or Codex, and the agent pays per call with no API keys.
Poncho
Consumer chat product that gives one person an agent with payments and tool access built in, powered by x402. Includes a SIWX-authenticated API for chats, resources and API keys.