I don't think any MasterCard is using Wavecrest. Only AdvCash did and they went down. It was expected after the shut down of their visa program as well. Either there is a crackdown again crypto-supporting pre-paid cards or (most possibly) Wavecrest was not compliant with EU rules and she went down.
wavecrest weren't satisfying visa's rules. that's the reason they got shut down.
Certainly that's what Visa said, very cryptically. I'm struck by the silence otherwise from both Visa and Wavecrest on the matter. Which rule(s), if any, were violated? Why did the two parties not come to some agreement "oops, our bad, fixed now" as is usually the case when huge revenues are involved. Why has some third party not appeared yet to fill the vacuum? It's still very strange imho and feels like bankster mischief to me so far - I hope I'm wrong.
As for MC, I have some MC prepaid cards from non-Wavecrest sources. Sometimes they work. Sometimes they are declined by MC with no explanation. They are prepaid with fiat, from companies that comply with all the KYC/AML mumbo-jumbo and additional highly-invasive identification procedures (think Jumio). Something is fishy, and it's not the customers.