SubEtha is a local, non-production proof of concept for machine payments: AI agents pay for HTTP resources with the x402 v2 flow, settled through zERC20's burn → proof-gated mint. What SubEtha hides is the correspondence between payer and provider on-chain; amounts are public. ## Where to start - [x402 v2 on SubEtha](/concepts/x402-v2/) — how a payment rides the official x402 v2 flow, and why `accepted` is never the same as `finalized`. - [Wire protocol reference](/reference/protocol/) — the normative `subetha-zerc20` scheme: identifiers, payload shapes, EIP-712 definitions, and the facilitator HTTP API. - [Configuration reference](/reference/configuration/) — facilitator TOML keys and the `SUBETHA_*` payer environment variables. - [TypeScript API](/reference/typescript/) and [Python API](/reference/python/) — the published payer/provider package surfaces. - [Versions & compatibility](/reference/compatibility/) — protocol scope, registry-verified package versions, and license boundaries. ## Scope - Everything on this site describes the **local, non-production PoC**. No page here produces or endorses a production deployment. - The protocol scope is **x402 v2 only**; MPP framing is deferred in the product at the pinned commit. - Quickstarts and the end-to-end tutorial remain the next documentation tasks. The [SubEtha product repository](https://github.com/peaceandwhisky/SubEtha) is canonical for anything this site does not yet cover. For future localization work, see the English-first policy in [Start here](/start-here/); Japanese is not published until complete.