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March 14, 2022 01:24
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// SPDX-License-Identifier: MIT | |
// @fbsloXBT | |
pragma solidity 0.8.12; | |
interface IChainLink { | |
function latestAnswer() external returns (uint256); | |
} | |
interface IUSDC { | |
function transfer(address to, uint256 amount) external; | |
function transferFrom(address from, address to, uint256 amount) external; | |
function balanceOf(address user) external returns (uint256); | |
} | |
contract LunaBet { | |
uint256 public start; | |
uint256 public startPrice; | |
address public lower; | |
address public higher; | |
function enter(bool side) external { | |
//Transfer 1,000,000 USDC from sender | |
IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).transferFrom(msg.sender, address(this), 1000000000000); | |
//if side = false, user is betting that luna price will be lower | |
if (side == false){ | |
require(lower == address(0), "Side already occupied"); | |
lower = msg.sender; | |
} else { | |
require(higher == address(0), "Side already occupied"); | |
higher = msg.sender; | |
} | |
if (lower != address(0) && higher != address(0)){ | |
start = block.timestamp; | |
startPrice = getLunaPrice(); | |
} | |
} | |
function redeem() external { | |
require(block.timestamp - start > 31556926, "1 year has not yet passed"); | |
uint256 balance = IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).balanceOf(address(this)); | |
if (getLunaPrice() > startPrice){ | |
IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).transfer(higher, balance); | |
} else if (getLunaPrice() < startPrice) { | |
IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).transfer(lower, balance); | |
} else { | |
IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).transfer(higher, balance / 2); | |
IUSDC(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48).transfer(lower, balance / 2); | |
} | |
} | |
//Returns USD value using ChainLink on Ethereum | |
function getLunaPrice() public returns (uint256) { | |
//get LUNA-ETH price | |
uint256 ethLuna = IChainLink(0x91E9331556ED76C9393055719986409e11b56f73).latestAnswer(); //18 decimals | |
//get ETH-USD | |
uint256 usdEth = IChainLink(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419).latestAnswer(); //8 decimals | |
//LUNA-USD value | |
return ethLuna * usdEth; //26 decimal places | |
} | |
} |
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