medium10 pts · first answer countstoken-standardsopenzeppelin

Tokens that return nothing

Your contract calls require(token.transfer(to, amount)). It works with most tokens but reverts with USDT on Ethereum mainnet. Why, and what is the usual fix?

A.USDT's transfer does not return a bool, so decoding the return value fails; use OpenZeppelin's SafeERC20 safeTransferB.USDT has 6 decimals, so the amount is wrong; multiply by 10^12C.USDT blocks all contract callers; use an EOA insteadD.USDT needs approve before transfer; call approve first

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Tokens that return nothing

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