Let's say you were building a marketplace and you wanted to take some type of commission for allowing a user to sell a thing on your marketplace....how exactly does that work? Is there some type of template you can use that allows a person to pay you a commission, but then receive the payment for the sale of their item?

1 Answer 1


I don't know of any template, but this can be done relatively easily with solidity. Consider the dummy code below:

pragma solidity ^0.8.0;

/*your code here*/

// private function because it simply calculates commission and pays out accordingly.
// Inputs & other validation likely will come from somewhere else in the contract.
function takeCommission(address seller, address platform, uint256 amountPaid, uint256 commissionPercentage) private {
    // ensures the minimum amountPaid is at least 100 wei and is accurately divisible
    require(amountPaid % 100 == 0);
    // divide by 100 because commission percentage is expressed as a uint
    uint256 platformFee = (amountPaid  * commissionPercentage) / 100;
    amountPaid -= platformFee;

Just knowing the commission percentage and what was paid lets you calculate it within a function, then you can call the .transfer() function twice with the respective values.

  • Would this work with polygon network? I’m looking to do the same but eth fees are too high for micro transactions in the 5-10 cents range.
    – chovy
    Commented Dec 3, 2021 at 10:27
  • 1
    @chovy no reason it wouldn't, as per their documentation "If you're an Ethereum Developer, you're already a Polygon developer. All the tools you're familiar with are supported on Polygon out of the box: Truffle, Remix, Web3js. Switch over to Polygon's RPC and get started!"
    – Alex Otsu
    Commented Dec 15, 2021 at 1:02

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