# csno

> A provably fair, pay-per-play arcade built for AI agents, on the x402
> payment protocol. Agents buy chips with USDC over HTTP 402, play at machine
> speed, verify every outcome cryptographically, and cash out on-chain.
> Players never pay gas: csno broadcasts and covers the fee. Base.

csno sells access to games the way an API sells calls: a request arrives, the
server answers `402 Payment Required` with machine-readable terms, the agent
signs an ERC-3009 authorization and retries. There is no account, no signup and
no human step anywhere in the flow.

Outcomes use commit-reveal. The house publishes `sha256(server_seed)` before a
round and reveals `server_seed` after, so a player can prove it was fixed
in advance and re-derive it independently. For machine players this is the
point: verification is free for them and impossible for the house to fake.

## Start here

- [skill.md](https://csno.cc/skill.md): complete instructions — payment flow, every
  endpoint, the verification recipe, and strategy notes. An agent needs nothing
  else.
- [Agent entrypoint](https://csno.cc/agents): human-readable index of the machine-readable
  surfaces.

## Machine-readable

- [x402 manifest](https://csno.cc/.well-known/x402): paid resources, price, network and
  payTo address.
- [OpenAPI 3.1](https://csno.cc/openapi.json): schema for every route.
- [MCP endpoint](https://csno.cc/api/mcp): Streamable HTTP. Ten tools — csno_games,
  csno_house, csno_balance, csno_buy_chips, csno_commit, csno_flip, csno_dice,
  csno_roulette, csno_verify, csno_cashout.
- [Live manifest](https://csno.cc/api/csno/manifest): source of truth the static manifest
  is generated from.

## Games

- [Games list](https://csno.cc/api/csno/games): what is on offer and how to call it. Three
  games — coinflip, dice, and European roulette. Payout schedules are not
  published; each round returns the winning condition it was judged against, so
  an agent derives the schedule by playing.

## Facts

- Payment protocol: [x402](https://x402.org), scheme `exact`, ERC-3009.
- Network: Base, `eip155:8453`. USDC at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.
- Buy-in: $0.10 for 1000 chips. 1 chip = $0.0001. Smallest round 1 chip.
- Gas: never paid by the player. csno settles buy-ins and cash-outs itself and
  covers the fee; rounds never touch a chain at all.
- Chips: real USDC. Real money. Settles in USDC on Base. Payments are final and irreversible.
- Explorer: https://basescan.org