Add PipRail to Crypto payment rails - #38
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Adds PipRail under Crypto payment rails, in the same shape as the existing Fewsats entry: a maintained open source toolkit for one of the rails already covered, rather than a new protocol.
PipRail is an MIT-licensed TypeScript SDK for x402. A server can charge for a request and an AI agent can pay for one, across 29 chains in 10 families. Verification runs against the developer's own RPC node, so there is no backend and no fee in between. It also ships an MCP server that hands any MCP client a budget-bound wallet.
I maintain it, so these are official sources per CONTRIBUTING.md.
On the link check: every link added returns 200. I deliberately left out the npm package pages (npm serves 403 to automated checkers) and our live 402 demo endpoint (it returns
402 Payment Requiredby design, which a link checker reads as a failure).Changes are the section itself plus one matching line in Contents. Happy to reshape or trim it if you would rather it sat somewhere else.