This question already has an answer here:
Why does http://api.stackoverflow.com/1.1/usage/stackauth-methods/sites not list Area 51 (http://area51.stackexchange.com/)
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marked as duplicate by Brock Adams♦ Dec 23 '18 at 4:06
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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This is because area51 doesn't have an API. It's not a traditional stack exchange site and runs differently.
