According to MinerMag, Bitcoin mining pool giant Foundry USA Pool returned an erroneously paid transaction fee of 8.18 BTC (approximately 777,000 USD). This fee was mistakenly paid by a user on December 19, far exceeding the normal fee by 91,127 times. Foundry stated that after careful consideration, it decided to refund the fee to the user and emphasized that similar cases will be handled on a case-by-case basis.