> ## Documentation Index
> Fetch the complete documentation index at: https://docs.goaly.fun/llms.txt
> Use this file to discover all available pages before exploring further.

# Contracts

> The on-chain contract behind Goaly.

Goaly is a single contract, **`GoalyPool`**, on **Arbitrum One**. It handles both the predictions and
the yield — there's no receipt token to manage.

| Contract      | Address                                                                                                                |
| ------------- | ---------------------------------------------------------------------------------------------------------------------- |
| **GoalyPool** | [`0x009b57aefAC6b10dF71a49982Eb3f678D2b4966C`](https://arbiscan.io/address/0x009b57aefAC6b10dF71a49982Eb3f678D2b4966C) |
| USDT0         | [`0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9`](https://arbiscan.io/address/0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9) |

Two functions do everything a player needs:

```solidity theme={null}
// Predict: stake a stablecoin on an outcome.
function placePrediction(bytes32 marketId, Outcome outcome, IERC20 token, uint256 amount, uint256 minStake);

// Claim: get your stake back (+ prize), in the token you choose.
function claim(bytes32 marketId, IERC20 outToken, uint256 minOut);
```

Source and tests live in the [monorepo](https://github.com/Goaly-Protocol/goaly) under `packages/contracts`.