Kalshi?

Not sure what you mean by “built on”. You can certainly bet on btc outcomes there though.

Also, Just an FYI , this guy you’re following is an imposter scammer account.   
Please unfollow them.  It gives them credibility otherwise.
🧡🍻👊🏻

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https://m.primal.net/MArX.jpg 

 https://www.bitcoinprediction.market/ of interest? 

 Cool thanks 

 Oh ok thanks for the heads up. He actually messaged me the other day  but I n never responded. I was like why the hell would Peter Mccormack go out of his way to randomly start messaging me??😂