According to the Stoxmarket site InOut Capital LLP (Edinburgh) is listed but this is not registered with the Financial Conduct Authority. Previously also VCapital DOO Podgorica was mentioned as a payment processor.
Card transactions appear on victims statements as http://www.stoxmarket.com / Podgorica / ME. At least the Norwegian bank DSB confirmed that Podgorica in fact is Atlas Banka.
Data gathered from the Stoxmarket Facebook group:
Wire transfers were made via a variety of PSPs (3 of them are registered under the UK’s FCA: Moorwand Ltd (aka Upay Card /UPC/ UPC Consulting but now sold? and registered under PAP Onpoint Services Cyprus), MoneyNetInt Ltd and PrePaid Financial Services).
Among other PSPs known are
B2G SRO Prague
MAYZUS FINANCIAL SERVICES LIMITED
VISION 7 Germany