Bitcoin transaction fees are continuously fluctuating, and they are modified according to the state of the mempool. If the mempool is overburdened, you might wish to utilize a larger transaction fee to receive confirmation sooner. If you are patient enough to wait for your transaction to be put in the block, you may still use a lower transaction cost than the recommended charge, but when the network is busy, it may take a long time to obtain that confirmation, even more than 24 hours. Just wanted to share my experience; I often utilize the transaction fee recommended by the two sites.
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