mcp-pay
Rust Payment awareness layer for MCP. A rail-agnostic manifest plus a reference HTTP 402 server.
mcp-pay extends the Model Context Protocol with a .well-known JSON manifest for declaring per-tool pricing and a Rust reference server that returns HTTP 402 on paid tools. Rail-agnostic across x402, MPP, Lightning and card.
Frequently asked questions
What is mcp-pay?
mcp-pay is an entry in the Neul Labs project catalogue. Payment awareness layer for MCP. A rail-agnostic manifest plus a reference HTTP 402 server. mcp-pay extends the Model Context Protocol with a .well-known JSON manifest for declaring per-tool pricing and a Rust reference server that returns HTTP 402 on paid tools. Rail-agnostic across x402, MPP, Lightning and card. Current source, licence, release and documentation status should be verified at the linked project surfaces.
How do I install mcp-pay?
Review the current repository and its README at https://github.com/neul-labs/mcp-pay for verified installation instructions.
What language is mcp-pay written in?
mcp-pay is written in Rust.
Is mcp-pay open source?
Source is linked at https://github.com/neul-labs/mcp-pay. Inspect the repository licence and release metadata for the exact version; Neul Labs does not apply one blanket licence claim to the whole catalogue.
How does mcp-pay compare to alternatives?
See the detailed comparison at https://www.neullabs.com/compare/mcp-pay-vs-x402.