Transaction fee is too low

[boaz30333]

Hey guys,
If I send a transaction with a fee that is too low, what is the node's behavior?
Does the sequence increase by 1?
I sent a transaction with 1 uatom, the node returned 0(success) and it looks like the transaction is in the mempool.
But then, on the one hand, when I tried to get the sequence from the node (https://rest.sentry-01.theta-testnet.polypore.xyz/cosmos/auth/v1beta1/accounts/cosmos1wa4x0pvla0ts7stktu4pnz3tjlz7ldqlgfu74k) it said sequence = 3, but on the other hand, when I trying to send another transaction with a sequence = 3 it says "account sequence mismatch, expected 4, got 3: incorrect account sequence"

[alexanderbez]

In theory, if the fee doesn't meet the node's local requirements, CheckTx should fail and thus the tx should never enter the mempool. However, sometimes these txs still make it on-chain, in which case, yes, you're nonce is bumped.