When i tried to use the transfer() i get the error revert ERC20: transfer amount exceeds balance but when i use transferFrom() with little changes, i don’t get the error. What could be the issue, please? Attached is a screenshot to show both implementations. Using TransferFrom [Screen Shot 2020-…

Hi @sirphemmiey , When an ERC20 token holder interacts with another contract using the token, two transactions are required: The token holder calls approve to set an allowance of tokens that the contract can use. (assuming an OpenZeppelin ERC20 implementation can use increaseAllowance ) The token h…

@abcoathup Aha, i see my silly mistake. Thanks for the detailed explanation. One more thing: Now that both operations are working, is/are there any edge(s) that transferFrom has over transfer and vice versa looking at it from a security perspective or in any other perspective you might think?

Hi @sirphemmiey , When using ERC20 tokens with a contract to “do stuff”, you need to use the approve and then transferFrom pattern, requiring two transactions. If the ERC20 token is an OpenZeppelin implementation then you should use increaseAllowance Alternatively you could look at creating ERC777…

ERC20 transfer not working

Support Contracts

Topic		Replies	Views
ERC20: transfer amount exceeds balance Contracts erc20 , erc721	5	22564	November 18, 2021
transferFrom() always reverts with "revert ERC20: transfer amount exceeds allowance" Contracts erc20	4	11319	December 31, 2021
Example on how to use ERC20 token in another contract Guides and Tutorials erc20	14	44382	May 26, 2022
Using approve to allow transfer of ERC20 tokens in a contract Contracts erc20	3	2873	October 29, 2020
Revert when using ERC20 transferFrom in a contract Contracts	3	3932	October 28, 2020

ERC20 transfer not working

Related topics