Quote from: Charles-Tim on Today at 09:42:44 PM

If your transaction is not having more than 500 bytes in size and the transaction fee paid is not less than 10 sat/byte, you can use ViaBTC free accelerator.

This is right and I just want to add that there's another requirement too.
If you want to use ViaBTC free accelerator, your transaction must not have any unconfirmed parents.

Quote from: Bitcoin_Arena on Today at 10:30:07 PM

This (confirmtx.net) or this (confirmtx.com). Both sites don't work... lol

I just visited the former and it was more than clear that it was a scam.
I entered a random transaction ID in their website and it gave me different options. It asks $999 for getting 3 confirmations in 60 seconds, $500 for getting 1 confirmation in 5 minutes, $50 for getting confirmation in 11 minutes, $25 for getting confirmation in 30 minutes and $15 for getting confirmation in 1 hour.

To any newbies reading this post:
There is no way to give a precise time for transaction confirmation and the website I wrote about is a scam.
As already mentioned by Charles-Tim above, ViaBTC service is the only working free accelerator.