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Goaly is a single contract, GoalyPool, on Arbitrum One. It handles both the predictions and the yield — there’s no receipt token to manage.
ContractAddress
GoalyPool0x009b57aefAC6b10dF71a49982Eb3f678D2b4966C
USDT00xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9
Two functions do everything a player needs: 
// 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 under packages/contracts.