# OptOut.cash

OptOut.cash is a private-only supported stablecoin to Bitcoin settlement coordinator.

User-facing product boundary:

- Input: USDC on Base, Ethereum, and BNB Chain; USDT on BNB Chain and Tron
- Output: native BTC
- Route/provider selection is hidden from the purchase flow
- Name-based destinations and alternate outputs are unsupported
- Runtime quotes show amount out, network cost, and quote expiry before payment
- After payment, the UI tracks settlement state and Bitcoin delivery instead of quote freshness

Canonical agent files:

- /llms.txt
- /llms-full.txt
- /openapi.yaml
- /.well-known/agent-capabilities.json
- /api/x402/capabilities

Primary agent operations:

- POST /api/settlements/quote
- POST /api/settlements/create

Privacy boundary:

OptOut.cash is privacy-preserving, not anonymous or untraceable. Stablecoin
funding transactions remain visible on their source networks. Native BTC outputs remain visible
on Bitcoin. Fresh BTC addresses reduce linkage.

Runtime quote and settlement responses are authoritative.