# Auria Chain – SDK for AI agents to pay AI agents over HTTP (x402)

> Source: <https://github.com/snowtech738-byte/auria-chain>
> Published: 2026-11-06 19:10:39+00:00

Infrastructure so AI agents can pay other AI agents over plain HTTP, settled on-chain, with no human in the loop and no new token.

- `packages/auria-chain/` — the SDK.`createSellerMiddleware` to paywall an
Express route,`createBuyer` to pay one. See its README for the API.
- `examples/demo/` — a working two-agent demo built on the SDK: a seller
that does real paid Claude work, a buyer that pays for it in testnet
USDC. See its README to run it.

This is an npm workspaces monorepo — `npm install` at the root links
`auria-chain` into `examples/demo` automatically.

Published on npm as [`auria-chain`](https://www.npmjs.com/package/auria-chain)
(`npm install auria-chain`). Testnet only (Base Sepolia) via the public
x402.org facilitator — production (Coinbase CDP facilitator, mainnet) is
not wired up yet. No token — this is deliberate; see the founder dossier.