
Yes — failed ERC20 transactions still consume gas and you are charged the fee. Ethereum validators perform computational work to process your transaction even if it ultimately fails. That work is compensated regardless of outcome.
Common reasons for failed ERC20 transactions include insufficient gas limit, contract errors, slippage tolerance exceeded on DEX swaps, and trying to interact with a contract that has already reached its limit. In all cases, the gas consumed is forfeited.
Why Validators Charge for Failed Transactions
When your transaction is submitted to the Ethereum network, validators start executing the smart contract code. If the execution fails midway — for example because a conditional check returns false — the work already performed is charged. Setting gas too low causes an 'out of gas' failure; the transaction is reverted but gas consumed up to the failure point is charged.
How to Avoid Failed Transactions
Always use the gas limit suggested by your wallet; it uses eth_estimateGas() to simulate the transaction first. For DEX trades, set a reasonable slippage tolerance (0.5–1% for stablecoins, 1–3% for volatile tokens). During high congestion periods, increase your gas limit by 10–20% as a buffer. Never manually set a gas limit below 65,000 for ERC20 transfers.
What to Do After a Failed Transaction
Check Etherscan with your transaction hash to understand the failure reason. Most failures show an error message in the transaction details. If the failure was due to low gas, resubmit with a higher gas limit. If it was a DEX slippage failure, increase tolerance and retry. Keep ETH in your wallet specifically to cover gas — you cannot pay ERC20 fees with the tokens being sent.
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