Replacement transaction underpriced / Replacement fee too low
This error may include "code":"REPLACEMENT_UNDERPRICED”.
What it means
The transaction sent with this nonce already exists in mempool with a higher gas price. This can occur if you are sending multiple transactions with the same nonce and same or lower gas price.
How to fix it
If you are resending the same transaction with the same nonce (e.g. “retrying” a transaction), ensure the gas price is 10%+ higher than the previous gas price. (Example: if the first transaction was sent with maxFeePerGas = 30 gwei, send the second with 40 gwei.)
If you are sending a new transaction, use the next available nonce. (Example: if the previous transaction was sent with nonce = 10, send the next one with nonce = 11.)
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