For roleplays the biggest AI websites I've been using is Janitor.AI and Joyland.AI.  Both are completly free to use for whatever usage you want, NSFW, role-playing, or even companionship if you wish.  
As of currently, Joyland.AI hasn't really been using coins to chat with bots per message, so it's kinda free; tho there are in-app/in-browser purch......			  
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