They are offering paid and free service they are just asking for small bitcoin cash unlike other fake accelerator..
You may also try this https://bitcointalksearch.org/topic/accelerate-your-transactions-via-antpool-by-yourself-no-need-to-ask-anybody-1951859
You can accelerate your transaction for free.
There is also other method like CPFP or Child Pays For Parent which working in my case when i had stuck transaction before..
To do this follow the step quoted below
1. Create a new address say X
2. Send 0.0001BTC to that new address X from your address on which BTC is stuck I.e 1Fh2GwdSfSDpfB5PpYjscB9u2inCoTmumX and this time include a fee of 850satoshi per byte on the transaction.
Your stuck tx will get confirmed in the next block if you follow this.
I already tried to submit your both transaction and hope in few hours your transaction could be confirm just also try to submit them in viabtc and antpool accelerator just incase.. ..
Thank you very much for trying to submit them for me!! It's appreciated very much. I have tried using viabtc's free accelerator but it never seems to work even when I try directly on the hour:/. I may try the child pays for parent option if it does not confirm within a few hours.
I also realized my fee was too low partially because of the version of electrum I was using. I have since updated and should no longer have this problem.
Thank you for the help !! Praying whatever accelerator you used will work