Circle's Smart Contract Platform simplifies ETH to USDC swaps via a smart contract with an SDK for easy deployment and interaction.
integrate Circle's Smart Contract Platform into their dApps or applications.
Prerequisites
Before proceeding with the ETH to USDC swaps using Circle's platform, ensure the following prerequisites are met:
Node.js (v16.14.2 or later) is installed on your local machine.
You have obtained a Circle Access Key and Secret Key. To learn how to generate these keys, refer to the Circle Developer Hub.
Node Package Manager (NPM) is installed.
Writing the Smart Contract
The smart contract will interact with Uniswap to perform the token swaps. Upon depositing ETH, it is converted to Wrapped ETH (WETH) and can be swapped for USDC using Uniswap's protocol.
Here's the contract code:
// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;
interface IUniswapV2Router02 {
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function WETH() external pure returns (address);
}
contract EthToUsdcSwap {
IUniswapV2Router02 private constant uniswapRouter = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F248cF);
address private constant usdcAddress = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
function swapEthToUsdc(
uint256 minUsdcAmount,
address to
) external payable {
address[] memory path = new address[](2);
path[0] = uniswapRouter.WETH();
path[1] = usdcAddress;
uniswapRouter.swapExactETHForTokens{value: msg.value}(
minUsdcAmount,
path,
to,
block.timestamp + 300
);
}
}
Compiling the Smart Contract
Use Remix IDE to compile the contract and obtain the ABI (Application Binary Interface) and bytecode.
Deploying the Smart Contract
Use Circle's SDK to deploy the compiled contract. Before proceeding, ensure you have set the CIRCLE_ACCESS_KEY and CIRCLE_SECRET_KEY environment variables in your terminal or script.
Here's an example command:
npx circle-smart-contracts deploy \
--abi="./build/contracts/EthToUsdcSwap.sol/EthToUsdcSwap.json" \
--bytecode="0x$(cat build/contracts/EthToUsdcSwap.sol/EthToUsdcSwap.bin)" \
--chain="ethereum" \
--constructor-args='[]' \
--output-dir="./output"
Upon successful deployment, you will receive a contractId and transactionId for future reference.
Interacting with the Deployed Contract
To perform token swaps using the deployed contract:
Before proceeding, ensure you have set the CIRCLE_ACCESS_KEY, CIRCLE_SECRET_KEY, CIRCLE_CONTRACT_ID, and CIRCLE_CHAIN environment variables in your terminal or script.
Here's an example command to swap 0.1 ETH to USDC and send the tokens to the specified address:
npx circle-smart-contracts interact \
--function="swapEthToUsdc" \
--args='[0.1, "0x$(circle-wallet)"]' \
--output-dir="./output"
This command will perform a token swap of 0.1 ETH to USDC and send the swapped USDC tokens to your Circle Pay wallet, which can be viewed in the Circle Developer Hub.
Conclusion
Circle's Smart Contract Platform offers a streamlined solution for deploying and managing smart contracts to swap ETH to USDC. By leveraging Circle's SDK, developers can easily execute transactions on the blockchain to integrate Circle's services into their dApps or applications.
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