Zebedee.

It works perfectly for me to buy gift cards from Bitrefill: https://www.bitrefill.com/invite/q3vi9c4y

It also has these advantages:

• has a variety of games that reward newcomers with sats fairly easily
• has tie-ups with Slice, thus entrenching itself with an ecosystem
• provides an email address that makes it convenient for people to use it as a burner account