Prolific is great, albeit sparse unless you're able to keep a tab open 24/7 with the extension running. You can't catch tasks, only get an alert when one pops up via the extension. VERY rarely I will get an email from Prolific about a study that's needing more participants, but don't count on that.
Most studies pay at least a fair wage, it's just that you'll never fill a work day up with Prolific the way you could with MTurk. The exchange rate works out in your favor if you're in the US as they pay out in GBP, and if you cash out with Circle, it auto-converts to $ and you can instantly transfer to your debit card after the funds are sent over from Prolific (which IIRC they do on Tuesdays/Fridays).