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Payout percentage (RTP) Casinos with higher RTPs tend to return more money to players over time.

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https://www.reddit.com/r/onlinegambling/comments/18b3vc9/looking_for_an_online_casino_with_instant_payout/
Stake.us is the only one I know. It is crypto though. I cash out to cash app or coinbase and have my money within minutes.