{"id":255285,"date":"2024-08-18T07:29:23","date_gmt":"2024-08-18T07:29:23","guid":{"rendered":"https:\/\/michigandigitalnews.com\/index.php\/2024\/08\/18\/circles-smart-contract-platform-enables-seamless-eth-to-usdc-swaps\/"},"modified":"2025-06-25T17:12:13","modified_gmt":"2025-06-25T17:12:13","slug":"circles-smart-contract-platform-enables-seamless-eth-to-usdc-swaps","status":"publish","type":"post","link":"https:\/\/michigandigitalnews.com\/index.php\/2024\/08\/18\/circles-smart-contract-platform-enables-seamless-eth-to-usdc-swaps\/","title":{"rendered":"Circle’s Smart Contract Platform Enables Seamless ETH to USDC Swaps"},"content":{"rendered":"

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\n Joerg Hiller<\/a>
\n Aug 16, 2024 04:42<\/span> \n <\/p>\n

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Circle’s Smart Contract Platform simplifies ETH to USDC swaps via a smart contract with an SDK for easy deployment and interaction.<\/p>\n


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\n \"Circle's
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Circle’s Smart Contract Platform now offers a streamlined method for swapping Ethereum (ETH) to USD Coin (USDC) via a smart contract. This development simplifies the process of deploying and interacting with smart contracts, leveraging an SDK that includes wallet and gas abstraction infrastructure, according to Circle.com.<\/p>\n

Prerequisites<\/h2>\n

To use Circle’s platform for ETH to USDC swaps, ensure you have:<\/p>\n

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  1. Remix IDE<\/a> for writing and compiling smart contracts.<\/li>\n
  2. Circle Web3 Services Account<\/a> for managing smart contract interactions.<\/li>\n
  3. Developer Controlled Wallet<\/a> for deploying and executing contract functions.<\/li>\n<\/ol>\n

    Writing the Smart Contract<\/h2>\n

    The smart contract interacts with Uniswap to perform token swaps. When ETH is deposited, it is converted to Wrapped ETH (WETH), which can be swapped for USDC using Uniswap’s protocol. Below is the contract code:<\/p>\n

    \n\/\/ SPDX-License-Identifier: GPL-2.0-or-later\npragma solidity ^0.8.20;\nimport '@uniswap\/v3-periphery\/contracts\/libraries\/TransferHelper.sol';\nimport '@uniswap\/v3-periphery\/contracts\/interfaces\/ISwapRouter.sol';\n\ncontract SwapExamples {\n    ISwapRouter public immutable swapRouter;\n    address public constant WETH9 = 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619;\n    address public constant USDC = 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359;\n    uint24 public constant poolFee = 3000;\n    \n    constructor(ISwapRouter _swapRouter) {\n        swapRouter = _swapRouter;\n    }\n\n    function swapExactInputSingle(uint256 amountIn) external returns (uint256 amountOut) {\n        TransferHelper.safeTransferFrom(WETH9, msg.sender, address(this), amountIn);\n        TransferHelper.safeApprove(WETH9, address(swapRouter), amountIn);\n        ISwapRouter.ExactInputSingleParams memory params = ISwapRouter.ExactInputSingleParams({\n            tokenIn: WETH9,\n            tokenOut: USDC,\n            fee: poolFee,\n            recipient: msg.sender,\n            deadline: block.timestamp,\n            amountIn: amountIn,\n            amountOutMinimum: 0,\n            sqrtPriceLimitX96: 0\n        });\n        amountOut = swapRouter.exactInputSingle(params);\n    }\n\n    function swapExactOutputSingle(uint256 amountOut, uint256 amountInMaximum) external returns (uint256 amountIn) {\n        TransferHelper.safeTransferFrom(WETH9, msg.sender, address(this), amountInMaximum);\n        TransferHelper.safeApprove(WETH9, address(swapRouter), amountInMaximum);\n        ISwapRouter.ExactOutputSingleParams memory params = ISwapRouter.ExactOutputSingleParams({\n            tokenIn: WETH9,\n            tokenOut: USDC,\n            fee: poolFee,\n            recipient: msg.sender,\n            deadline: block.timestamp,\n            amountOut: amountOut,\n            amountInMaximum: amountInMaximum,\n            sqrtPriceLimitX96: 0\n        });\n        amountIn = swapRouter.exactOutputSingle(params);\n        if (amountIn < amountInMaximum) {\n            TransferHelper.safeApprove(WETH9, address(swapRouter), 0);\n            TransferHelper.safeTransfer(WETH9, msg.sender, amountInMaximum - amountIn);\n        }\n    }\n}\n<\/code><\/pre>\n
    Compiling the Smart Contract<\/h2>\n
    Use Remix IDE to compile the contract to obtain the ABI (Application Binary Interface) and bytecode:<\/p>\n