# OptOut.cash

OptOut.cash coordinates private-only settlement from supported USDC and USDT rails into native BTC.
The user or agent supplies a supported stablecoin rail and a fresh Bitcoin address. Route details
are implementation details, not user-facing options.

## Canonical Surfaces

- Human app: /
- About page: /about
- OpenAPI: /openapi.yaml
- AI search summary: /ai.txt
- Full AI context: /llms-full.txt
- Agent capability manifest: /.well-known/agent-capabilities.json
- Capability boundary: /api/x402/capabilities

## Current Product

- Input assets: USDC on Base, Ethereum, and BNB Chain; USDT on BNB Chain and Tron
- Live output: native Bitcoin L1
- User-facing privacy mode: always on
- Name-based destinations: unsupported
- Alternate outputs: unsupported
- User-facing route selection: disabled

## Primary Operations

- `POST /api/settlements/quote`: quote stablecoin to BTC settlement.
- `POST /api/settlements/create`: create settlement instructions. Requires `Idempotency-Key`.
- `GET /api/x402/capabilities`: inspect supported input, output, and replay policy.
- `POST /api/quotes/thorchain`: low-level quote testing route.
- `GET /api/status/thorchain`: inspect settlement state from a funding transaction.
- `GET /api/status/bitcoin`: inspect Bitcoin mempool or confirmation state from a BTC transaction.

## Boundaries For Agents

- Do not offer unlisted rails, alternate outputs, or name-based destinations.
- Do not expose THORChain memo, vault, router, or provider internals to human users.
- Do not fake quotes, fees, status, transaction hashes, or BTC delivery.
- Quote routes are safe to retry.
- Settlement creation requires `Idempotency-Key`; retry the same key for the same intended settlement.
- Runtime quote and settlement responses are authoritative over this document.