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Uniswap V3 Flashloans and Arbitrage
const { Contract, ContractFactory, utils, BigNumber } = require("ethers")
const WETH9 = require("../WETH9.json")
const artifacts = {
UniswapV3Factory: require("@uniswap/v3-core/artifacts/contracts/UniswapV3Factory.sol/UniswapV3Factory.json"),
SwapRouter: require("@uniswap/v3-periphery/artifacts/contracts/SwapRouter.sol/SwapRouter.json"),
NFTDescriptor: require("@uniswap/v3-periphery/artifacts/contracts/libraries/NFTDescriptor.sol/NFTDescriptor.json"),
NonfungibleTokenPositionDescriptor: require("@uniswap/v3-periphery/artifacts/contracts/NonfungibleTokenPositionDescriptor.sol/NonfungibleTokenPositionDescriptor.json"),
NonfungiblePositionManager: require("@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json"),
WETH9,
};
const linkLibraries = ({ bytecode, linkReferences }, libraries) => {
Object.keys(linkReferences).forEach((fileName) => {
Object.keys(linkReferences[fileName]).forEach((contractName) => {
if (!libraries.hasOwnProperty(contractName)) {
throw new Error(`Missing link library name ${contractName}`)
}
const address = utils
.getAddress(libraries[contractName])
.toLowerCase()
.slice(2)
linkReferences[fileName][contractName].forEach(
({ start, length }) => {
const start2 = 2 + start * 2
const length2 = length * 2
bytecode = bytecode
.slice(0, start2)
.concat(address)
.concat(bytecode.slice(start2 + length2, bytecode.length))
}
)
})
})
return bytecode
}
async function main() {
const [owner] = await ethers.getSigners();
Weth = new ContractFactory(artifacts.WETH9.abi, artifacts.WETH9.bytecode, owner);
weth = await Weth.deploy();
Factory = new ContractFactory(artifacts.UniswapV3Factory.abi, artifacts.UniswapV3Factory.bytecode, owner);
factory = await Factory.deploy();
SwapRouter = new ContractFactory(artifacts.SwapRouter.abi, artifacts.SwapRouter.bytecode, owner);
swapRouter = await SwapRouter.deploy(factory.address, weth.address);
NFTDescriptor = new ContractFactory(artifacts.NFTDescriptor.abi, artifacts.NFTDescriptor.bytecode, owner);
nftDescriptor = await NFTDescriptor.deploy();
const linkedBytecode = linkLibraries(
{
bytecode: artifacts.NonfungibleTokenPositionDescriptor.bytecode,
linkReferences: {
"NFTDescriptor.sol": {
NFTDescriptor: [
{
length: 20,
start: 1261,
},
],
},
},
},
{
NFTDescriptor: nftDescriptor.address,
}
);
NonfungibleTokenPositionDescriptor = new ContractFactory(artifacts.NonfungibleTokenPositionDescriptor.abi, linkedBytecode, owner);
nonfungibleTokenPositionDescriptor = await NonfungibleTokenPositionDescriptor.deploy(weth.address);
NonfungiblePositionManager = new ContractFactory(artifacts.NonfungiblePositionManager.abi, artifacts.NonfungiblePositionManager.bytecode, owner);
nonfungiblePositionManager = await NonfungiblePositionManager.deploy(factory.address, weth.address, nonfungibleTokenPositionDescriptor.address);
console.log('WETH_ADDRESS=', `'${weth.address}'`)
console.log('FACTORY_ADDRESS=', `'${factory.address}'`)
console.log('SWAP_ROUTER_ADDRESS=', `'${swapRouter.address}'`)
console.log('NFT_DESCRIPTOR_ADDRESS=', `'${nftDescriptor.address}'`)
console.log('POSITION_DESCRIPTOR_ADDRESS=', `'${nonfungibleTokenPositionDescriptor.address}'`)
console.log('POSITION_MANAGER_ADDRESS=', `'${nonfungiblePositionManager.address}'`)
}
/*
npx hardhat run --network localhost scripts/01_deployContracts.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
async function main() {
const [owner, signer2] = await ethers.getSigners();
Tether = await ethers.getContractFactory('Tether', owner);
tether = await Tether.deploy();
Usdc = await ethers.getContractFactory('UsdCoin', owner);
usdc = await Usdc.deploy();
await tether.connect(owner).mint(
owner.address,
ethers.utils.parseEther('100000')
)
await usdc.connect(owner).mint(
owner.address,
ethers.utils.parseEther('100000')
)
console.log('TETHER_ADDRESS=', `'${tether.address}'`)
console.log('USDC_ADDRESS=', `'${usdc.address}'`)
}
/*
npx hardhat run --network localhost scripts/02_deployTokens.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
// Token addresses
TETHER_ADDRESS= '0x0165878A594ca255338adfa4d48449f69242Eb8F'
USDC_ADDRESS= '0xa513E6E4b8f2a923D98304ec87F64353C4D5C853'
// Uniswap contract address
WETH_ADDRESS= '0x5FbDB2315678afecb367f032d93F642f64180aa3'
FACTORY_ADDRESS= '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512'
SWAP_ROUTER_ADDRESS= '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0'
NFT_DESCRIPTOR_ADDRESS= '0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9'
POSITION_DESCRIPTOR_ADDRESS= '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
POSITION_MANAGER_ADDRESS= '0x5FC8d32690cc91D4c39d9d3abcBD16989F875707'
const artifacts = {
UniswapV3Factory: require("@uniswap/v3-core/artifacts/contracts/UniswapV3Factory.sol/UniswapV3Factory.json"),
NonfungiblePositionManager: require("@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json"),
};
const { Contract, BigNumber } = require("ethers")
const bn = require('bignumber.js')
bn.config({ EXPONENTIAL_AT: 999999, DECIMAL_PLACES: 40 })
const provider = waffle.provider;
function encodePriceSqrt(reserve1, reserve0) {
return BigNumber.from(
new bn(reserve1.toString())
.div(reserve0.toString())
.sqrt()
.multipliedBy(new bn(2).pow(96))
.integerValue(3)
.toString()
)
}
const nonfungiblePositionManager = new Contract(
POSITION_MANAGER_ADDRESS,
artifacts.NonfungiblePositionManager.abi,
provider
)
const factory = new Contract(
FACTORY_ADDRESS,
artifacts.UniswapV3Factory.abi,
provider
)
async function deployPool(token0, token1, fee, price) {
const [owner] = await ethers.getSigners();
await nonfungiblePositionManager.connect(owner).createAndInitializePoolIfNecessary(
token0,
token1,
fee,
price,
{ gasLimit: 5000000 }
)
const poolAddress = await factory.connect(owner).getPool(
token0,
token1,
fee,
)
return poolAddress
}
async function main() {
const usdtUsdc500 = await deployPool(TETHER_ADDRESS, USDC_ADDRESS, 500, encodePriceSqrt(1, 1))
const usdtUsdc3000 = await deployPool(TETHER_ADDRESS, USDC_ADDRESS, 3000, encodePriceSqrt(1, 2))
const usdtUsdc10000 = await deployPool(TETHER_ADDRESS, USDC_ADDRESS, 10000, encodePriceSqrt(2, 1))
console.log('USDT_USDC_500=', `'${usdtUsdc500}'`)
console.log('USDT_USDC_3000=', `'${usdtUsdc3000}'`)
console.log('USDT_USDC_10000=', `'${usdtUsdc10000}'`)
}
/*
npx hardhat run --network localhost scripts/03_deployPools.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
// Uniswap contract addresses
WETH_ADDRESS= '0x5FbDB2315678afecb367f032d93F642f64180aa3'
FACTORY_ADDRESS= '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512'
SWAP_ROUTER_ADDRESS= '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0'
NFT_DESCRIPTOR_ADDRESS= '0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9'
POSITION_DESCRIPTOR_ADDRESS= '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
POSITION_MANAGER_ADDRESS= '0x5FC8d32690cc91D4c39d9d3abcBD16989F875707'
// Pool addresses
USDT_USDC_500= '0x1FA8DDa81477A5b6FA1b2e149e93ed9C7928992F'
USDT_USDC_3000= '0x3B00F82071576B8489A6e3df223dcC0e937841d1'
USDT_USDC_10000= '0xb09EB46A30889ae3cE4AFa5d8ebD136B4f389B85'
// Token addresses
TETHER_ADDRESS= '0x0165878A594ca255338adfa4d48449f69242Eb8F'
USDC_ADDRESS= '0xa513E6E4b8f2a923D98304ec87F64353C4D5C853'
const artifacts = {
NonfungiblePositionManager: require("@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json"),
Usdt: require("../artifacts/contracts/Tether.sol/Tether.json"),
Usdc: require("../artifacts/contracts/UsdCoin.sol/UsdCoin.json"),
UniswapV3Pool: require("@uniswap/v3-core/artifacts/contracts/UniswapV3Pool.sol/UniswapV3Pool.json"),
};
const { Contract } = require("ethers")
const { Token } = require('@uniswap/sdk-core')
const { Pool, Position, nearestUsableTick } = require('@uniswap/v3-sdk')
async function getPoolData(poolContract) {
const [tickSpacing, fee, liquidity, slot0] = await Promise.all([
poolContract.tickSpacing(),
poolContract.fee(),
poolContract.liquidity(),
poolContract.slot0(),
])
return {
tickSpacing: tickSpacing,
fee: fee,
liquidity: liquidity,
sqrtPriceX96: slot0[0],
tick: slot0[1],
}
}
LIQUIDITY = ethers.utils.parseEther('100')
DEADLINE = Math.floor(Date.now() / 1000) + (60 * 10)
POOL_ADDRESSES = [USDT_USDC_500, USDT_USDC_3000, USDT_USDC_10000] // ,
async function main() {
const [owner, signer2] = await ethers.getSigners();
const provider = waffle.provider;
const nonfungiblePositionManager = new Contract(
POSITION_MANAGER_ADDRESS,
artifacts.NonfungiblePositionManager.abi,
provider
)
const usdtContract = new Contract(TETHER_ADDRESS,artifacts.Usdt.abi,provider)
const usdcContract = new Contract(USDC_ADDRESS,artifacts.Usdc.abi,provider)
await usdtContract.connect(owner).approve(POSITION_MANAGER_ADDRESS, ethers.utils.parseEther('9999999'))
await usdcContract.connect(owner).approve(POSITION_MANAGER_ADDRESS, ethers.utils.parseEther('9999999'))
const UsdtToken = new Token(31337, TETHER_ADDRESS, 18, 'USDT', 'Tether')
const UsdcToken = new Token(31337, USDC_ADDRESS, 18, 'USDC', 'UsdCoin')
const poolContract1 = new Contract(USDT_USDC_500, artifacts.UniswapV3Pool.abi, provider)
const poolContract2 = new Contract(USDT_USDC_3000, artifacts.UniswapV3Pool.abi, provider)
const poolContract3 = new Contract(USDT_USDC_10000, artifacts.UniswapV3Pool.abi, provider)
const poolData = {}
poolData[USDT_USDC_500] = await getPoolData(poolContract1)
poolData[USDT_USDC_3000] = await getPoolData(poolContract2)
poolData[USDT_USDC_10000] = await getPoolData(poolContract3)
// appears I cannot interact with contracts in the async map
const mintParams = {}
POOL_ADDRESSES.map(async poolAddress => {
pd = poolData[poolAddress]
const poolObj = new Pool(
UsdtToken,
UsdcToken,
pd.fee,
pd.sqrtPriceX96.toString(),
pd.liquidity.toString(),
pd.tick
)
const tickLower = nearestUsableTick(pd.tick, pd.tickSpacing) - pd.tickSpacing * 100
const tickUpper = nearestUsableTick(pd.tick, pd.tickSpacing) + pd.tickSpacing * 100
const positionObj = new Position({
pool: poolObj,
liquidity: LIQUIDITY,
tickLower: tickLower,
tickUpper: tickUpper,
})
const { amount0: amount0Desired, amount1: amount1Desired} = positionObj.mintAmounts
const params = {
token0: TETHER_ADDRESS,
token1: USDC_ADDRESS,
fee: pd.fee,
tickLower: tickLower,
tickUpper: tickUpper,
amount0Desired: amount0Desired.toString(),
amount1Desired: amount1Desired.toString(),
amount0Min: 0,
amount1Min: 0,
recipient: signer2.address,
deadline: DEADLINE
}
mintParams[poolAddress] = params
})
const tx1 = await nonfungiblePositionManager.connect(owner).mint(mintParams[USDT_USDC_500], { gasLimit: '1000000' })
await tx1.wait()
const tx2 = await nonfungiblePositionManager.connect(owner).mint(mintParams[USDT_USDC_3000], { gasLimit: '1000000' })
await tx2.wait()
const tx3 = await nonfungiblePositionManager.connect(owner).mint(mintParams[USDT_USDC_10000], { gasLimit: '1000000' })
await tx3.wait()
console.log('done')
}
/*
npx hardhat run --network localhost scripts/04_addLiquidity.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
// pool
USDT_USDC_500= '0x1FA8DDa81477A5b6FA1b2e149e93ed9C7928992F'
USDT_USDC_3000= '0x3B00F82071576B8489A6e3df223dcC0e937841d1'
USDT_USDC_10000= '0xb09EB46A30889ae3cE4AFa5d8ebD136B4f389B85'
const UniswapV3Pool = require("@uniswap/v3-core/artifacts/contracts/UniswapV3Pool.sol/UniswapV3Pool.json")
const { Contract, BigNumber } = require("ethers")
async function getPoolData(poolContract) {
const [tickSpacing, fee, liquidity, slot0] = await Promise.all([
poolContract.tickSpacing(),
poolContract.fee(),
poolContract.liquidity(),
poolContract.slot0(),
])
const sqrtPriceX96 = slot0[0]
const numerator = BigNumber.from(sqrtPriceX96).pow(2)
const denominator = BigNumber.from(2).pow(192)
const priceRatio = numerator/denominator
return {
tickSpacing: tickSpacing,
fee: fee,
liquidity: liquidity.toString(),
sqrtPriceX96: sqrtPriceX96.toString(),
priceRatio: priceRatio.toString(),
tick: slot0[1],
}
}
async function main() {
const provider = waffle.provider;
const poolContract500 = new Contract(USDT_USDC_500, UniswapV3Pool.abi, provider)
const poolData500 = await getPoolData(poolContract500)
console.log('poolData500', poolData500)
const poolContract3000 = new Contract(USDT_USDC_3000, UniswapV3Pool.abi, provider)
const poolData3000 = await getPoolData(poolContract3000)
console.log('poolData3000', poolData3000)
const poolContract10000 = new Contract(USDT_USDC_10000, UniswapV3Pool.abi, provider)
const poolData10000 = await getPoolData(poolContract10000)
console.log('poolData10000', poolData10000)
}
/*
npx hardhat run --network localhost scripts/05_checkLiquidity.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
const { Contract } = require("ethers")
// Uniswap contract address
WETH_ADDRESS= '0x5FbDB2315678afecb367f032d93F642f64180aa3'
FACTORY_ADDRESS= '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512'
SWAP_ROUTER_ADDRESS= '0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0'
NFT_DESCRIPTOR_ADDRESS= '0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9'
POSITION_DESCRIPTOR_ADDRESS= '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
POSITION_MANAGER_ADDRESS= '0x5FC8d32690cc91D4c39d9d3abcBD16989F875707'
// Token addresses
TETHER_ADDRESS= '0x0165878A594ca255338adfa4d48449f69242Eb8F'
USDC_ADDRESS= '0xa513E6E4b8f2a923D98304ec87F64353C4D5C853'
const WETH9 = require("../WETH9.json")
const artifacts = {
UniswapV3Factory: require("@uniswap/v3-core/artifacts/contracts/UniswapV3Factory.sol/UniswapV3Factory.json"),
SwapRouter: require("@uniswap/v3-periphery/artifacts/contracts/SwapRouter.sol/SwapRouter.json"),
NFTDescriptor: require("@uniswap/v3-periphery/artifacts/contracts/libraries/NFTDescriptor.sol/NFTDescriptor.json"),
NonfungibleTokenPositionDescriptor: require("@uniswap/v3-periphery/artifacts/contracts/NonfungibleTokenPositionDescriptor.sol/NonfungibleTokenPositionDescriptor.json"),
NonfungiblePositionManager: require("@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json"),
Usdt: require("../artifacts/contracts/Tether.sol/Tether.json"),
Usdc: require("../artifacts/contracts/UsdCoin.sol/UsdCoin.json"),
WETH9,
};
const toEth = (wei) => ethers.utils.formatEther(wei)
async function main() {
const provider = waffle.provider;
const [owner, signer2] = await ethers.getSigners();
Flash = await ethers.getContractFactory('PairFlash', signer2);
flash = await Flash.deploy(SWAP_ROUTER_ADDRESS, FACTORY_ADDRESS, WETH_ADDRESS);
console.log('flash', flash.address)
const usdtContract = new Contract(TETHER_ADDRESS,artifacts.Usdt.abi,provider)
const usdcContract = new Contract(USDC_ADDRESS,artifacts.Usdc.abi,provider)
let usdtBalance = await usdtContract.connect(provider).balanceOf(signer2.address)
let usdcBalance = await usdcContract.connect(provider).balanceOf(signer2.address)
console.log('-------------------- BEFORE')
console.log('usdtBalance', toEth(usdtBalance.toString()))
console.log('usdcBalance', toEth(usdcBalance.toString()))
console.log('--------------------')
const tx = await flash.connect(signer2).initFlash(
[
TETHER_ADDRESS,
USDC_ADDRESS,
500,
ethers.utils.parseEther('1'),
ethers.utils.parseEther('1'),
3000,
10000
],
{ gasLimit: ethers.utils.hexlify(1000000) }
);
await tx.wait()
usdtBalance = await usdtContract.connect(provider).balanceOf(signer2.address)
usdcBalance = await usdcContract.connect(provider).balanceOf(signer2.address)
console.log('-------------------- AFTER')
console.log('usdtBalance', toEth(usdtBalance.toString()))
console.log('usdcBalance', toEth(usdcBalance.toString()))
console.log('--------------------')
}
/*
npx hardhat run --network localhost scripts/06_flashSwap.js
*/
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
require("@nomiclabs/hardhat-waffle");
module.exports = {
solidity: {
compilers: [
{ version: "0.7.6" },
],
settings: {
optimizer: {
enabled: true,
runs: 5000,
details: { yul: false },
},
}
},
};
{
"name": "solidity-flashswap-1",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"@nomiclabs/hardhat-ethers": "^2.2.1",
"@nomiclabs/hardhat-waffle": "^2.0.3",
"@openzeppelin/contracts": "^3.4.0",
"@uniswap/v3-periphery": "^1.0.1",
"@uniswap/v3-sdk": "^3.9.0",
"bignumber.js": "^9.1.0",
"ethereum-waffle": "^3.4.4",
"ethers": "^5.7.2",
"hardhat": "^2.12.2"
}
}
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity =0.7.6;
pragma abicoder v2;
import '@uniswap/v3-core/contracts/interfaces/callback/IUniswapV3FlashCallback.sol';
import '@uniswap/v3-core/contracts/libraries/LowGasSafeMath.sol';
import '@uniswap/v3-periphery/contracts/base/PeripheryPayments.sol';
import '@uniswap/v3-periphery/contracts/base/PeripheryImmutableState.sol';
import '@uniswap/v3-periphery/contracts/libraries/PoolAddress.sol';
import '@uniswap/v3-periphery/contracts/libraries/CallbackValidation.sol';
import '@uniswap/v3-periphery/contracts/libraries/TransferHelper.sol';
import '@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol';
contract PairFlash is IUniswapV3FlashCallback, PeripheryImmutableState, PeripheryPayments {
using LowGasSafeMath for uint256;
using LowGasSafeMath for int256;
ISwapRouter public immutable swapRouter;
constructor(
ISwapRouter _swapRouter,
address _factory,
address _WETH9
) PeripheryImmutableState(_factory, _WETH9) {
swapRouter = _swapRouter;
}
function uniswapV3FlashCallback(
uint256 fee0,
uint256 fee1,
bytes calldata data
) external override {
FlashCallbackData memory decoded = abi.decode(data, (FlashCallbackData));
CallbackValidation.verifyCallback(factory, decoded.poolKey);
address token0 = decoded.poolKey.token0;
address token1 = decoded.poolKey.token1;
TransferHelper.safeApprove(token0, address(swapRouter), decoded.amount0);
TransferHelper.safeApprove(token1, address(swapRouter), decoded.amount1);
uint256 amount1Min = LowGasSafeMath.add(decoded.amount1, fee1);
uint256 amount0Min = LowGasSafeMath.add(decoded.amount0, fee0);
uint256 amountOut0 =
swapRouter.exactInputSingle(
ISwapRouter.ExactInputSingleParams({
tokenIn: token1,
tokenOut: token0,
fee: decoded.poolFee2,
recipient: address(this),
deadline: block.timestamp,
amountIn: decoded.amount1,
amountOutMinimum: amount0Min,
sqrtPriceLimitX96: 0
})
);
uint256 amountOut1 =
swapRouter.exactInputSingle(
ISwapRouter.ExactInputSingleParams({
tokenIn: token0,
tokenOut: token1,
fee: decoded.poolFee3,
recipient: address(this),
deadline: block.timestamp,
amountIn: decoded.amount0,
amountOutMinimum: amount1Min,
sqrtPriceLimitX96: 0
})
);
uint256 amount0Owed = LowGasSafeMath.add(decoded.amount0, fee0);
uint256 amount1Owed = LowGasSafeMath.add(decoded.amount1, fee1);
TransferHelper.safeApprove(token0, address(this), amount0Owed);
TransferHelper.safeApprove(token1, address(this), amount1Owed);
if (amount0Owed > 0) pay(token0, address(this), msg.sender, amount0Owed);
if (amount1Owed > 0) pay(token1, address(this), msg.sender, amount1Owed);
if (amountOut0 > amount0Owed) {
uint256 profit0 = LowGasSafeMath.sub(amountOut0, amount0Owed);
TransferHelper.safeApprove(token0, address(this), profit0);
pay(token0, address(this), decoded.payer, profit0);
}
if (amountOut1 > amount1Owed) {
uint256 profit1 = LowGasSafeMath.sub(amountOut1, amount1Owed);
TransferHelper.safeApprove(token0, address(this), profit1);
pay(token1, address(this), decoded.payer, profit1);
}
}
struct FlashParams {
address token0;
address token1;
uint24 fee1;
uint256 amount0;
uint256 amount1;
uint24 fee2;
uint24 fee3;
}
struct FlashCallbackData {
uint256 amount0;
uint256 amount1;
address payer;
PoolAddress.PoolKey poolKey;
uint24 poolFee2;
uint24 poolFee3;
}
function initFlash(FlashParams memory params) external {
// {token0: token0, token1: token1, fee: fee}
PoolAddress.PoolKey memory poolKey = PoolAddress.PoolKey({token0: params.token0, token1: params.token1, fee: params.fee1});
IUniswapV3Pool pool = IUniswapV3Pool(PoolAddress.computeAddress(factory, poolKey));
pool.flash(
address(this),
params.amount0,
params.amount1,
abi.encode(
FlashCallbackData({
amount0: params.amount0,
amount1: params.amount1,
payer: msg.sender,
poolKey: poolKey,
poolFee2: params.fee2,
poolFee3: params.fee3
})
)
);
}
}
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity =0.7.6;
import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import "@openzeppelin/contracts/access/Ownable.sol";
contract Tether is ERC20, Ownable {
constructor() ERC20('Tether', 'USDT') {}
function mint(address to, uint256 amount) public onlyOwner {
_mint(to, amount);
}
}
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity =0.7.6;
import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import "@openzeppelin/contracts/access/Ownable.sol";
contract UsdCoin is ERC20, Ownable {
constructor() ERC20('UsdCoin', 'USDC') {}
function mint(address to, uint256 amount) public onlyOwner {
_mint(to, amount);
}
}
{
"bytecode": 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"abi": [
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [{ "name": "", "type": "string" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{ "name": "guy", "type": "address" },
{ "name": "wad", "type": "uint256" }
],
"name": "approve",
"outputs": [{ "name": "", "type": "bool" }],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [{ "name": "", "type": "uint256" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{ "name": "src", "type": "address" },
{ "name": "dst", "type": "address" },
{ "name": "wad", "type": "uint256" }
],
"name": "transferFrom",
"outputs": [{ "name": "", "type": "bool" }],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [{ "name": "wad", "type": "uint256" }],
"name": "withdraw",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [{ "name": "", "type": "uint8" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [{ "name": "", "type": "address" }],
"name": "balanceOf",
"outputs": [{ "name": "", "type": "uint256" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [{ "name": "", "type": "string" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{ "name": "dst", "type": "address" },
{ "name": "wad", "type": "uint256" }
],
"name": "transfer",
"outputs": [{ "name": "", "type": "bool" }],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "deposit",
"outputs": [],
"payable": true,
"stateMutability": "payable",
"type": "function"
},
{
"constant": true,
"inputs": [
{ "name": "", "type": "address" },
{ "name": "", "type": "address" }
],
"name": "allowance",
"outputs": [{ "name": "", "type": "uint256" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{ "payable": true, "stateMutability": "payable", "type": "fallback" },
{
"anonymous": false,
"inputs": [
{ "indexed": true, "name": "src", "type": "address" },
{ "indexed": true, "name": "guy", "type": "address" },
{ "indexed": false, "name": "wad", "type": "uint256" }
],
"name": "Approval",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{ "indexed": true, "name": "src", "type": "address" },
{ "indexed": true, "name": "dst", "type": "address" },
{ "indexed": false, "name": "wad", "type": "uint256" }
],
"name": "Transfer",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{ "indexed": true, "name": "dst", "type": "address" },
{ "indexed": false, "name": "wad", "type": "uint256" }
],
"name": "Deposit",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{ "indexed": true, "name": "src", "type": "address" },
{ "indexed": false, "name": "wad", "type": "uint256" }
],
"name": "Withdrawal",
"type": "event"
}
]
}
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