I have some suggestions here, but I'm not sure it's all safe, actually, for me, I just read to knowing
1. Bidali: accept lots of cryptocurrencies
2. InstaGift: need to register
3. Bitcoin Gift Cards: accept BTC
4. Fold App: you can get a cup of coffee at Starbucks through it, I do not have information about it.

I also know a little bit about Paxful, but I won't recommend it here, because I saw an topic reporting it on this forum a few days ago.