Technically, can we know that a transaction is supported by tx accelerator or not and by what tool?
I searched and could not find anything to check this information.
One indicator would be the block where it's included.
If the pool or solo miner uses a publicly known address that they own or put an
OP_RETURN output where there's info about the miner,
then if that pool offers accelerator service, that may be a faint clue that it was accelerated.
In OP's case, the transaction was mined in F2Pool's block and F2Pool has their own accelerator service.
What we don't know is if mempool.space is working with them to implement their own accelerator service.
But I've created my own test account in mempool.space within the same timeframe as OP and it's still in "
waiting list" as of now.