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I wanna call 3 functions of 3 different smart contracts which swap, buy and sell some ERC20/ERC721 tokens. all 3 functions are of 3 different smart contracts owned by 3 different websites.

I wanna do it with of function of solidity, not by making web3 function which interact with the three contracts.

can we do it ?

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  • You can do this with PRBProxy. Jul 10, 2022 at 9:59
  • yep. it's pretty standard to call functions on other contracts, and assuming functions on the other contracts don't have protections to prevent it
    – sola24
    Jul 10, 2022 at 10:00

1 Answer 1

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if you want to use functions from a deployed smart contract, you can make an interface of the deployed contract inside your contract and make an instance of it. here is the example code-

pragma solidity ^0.5.17;

interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);

function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);

function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
}

interface IWETH  {
function deposit() external payable;
function withdraw(uint) external;
}

contract demo {

address weth=0xc778417E063141139Fce010982780140Aa0cD5Ab;



function getWETH() public payable {
   //IWETH(weth).deposit{value: msg.value}();
  IWETH(weth).deposit.value(msg.value)();

}
}

here I have made an interface of WETH contract deployed on testnet. Then in contract demo, I have made an instance of smart contract by it's contract address and called the smart contract function using its instance.

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