Some of these are viable payment processors, but if you're trying to run anything vaguely like a market, it's hard to replace Stripe. I've tried. In detail, so

Some of these are viable payment processors, but if you're trying to run anything vaguely like a market, it's hard to replace Stripe. I've tried. In detail, something that handles both credit card payments from users and ACH payouts to users, possibly with some substitutions like debit instead of credit or wire instead of ACH. Ideally allowing user-to-user payments without having to float the money yourself. Stripe is handling some big regulatory hurdles for you, like KYC.