Block Explorer Base Sepolia https://k12.instructure.com/eportfolios/1098588/entries/3707785 So, if there is a lot of transactions from the mempool and also you paid out a comparatively lower transaction cost, your transaction can keep on being unconfirmed for an prolonged time period given that miners/validators will pick transactions with larger costs 1st. The mempool https://socialmarkz.com/story11078600/explorer-blockchain-usdt-how-much-you-need-to-expect-you-ll-pay-for-a-good-explorer-blockchain-usdt-https-cutt-ly-3rj9ygbc