How would I get the universe ID by a place ID?

[EgizianoEG (Egiziano)]

yeah, I found out… a Cookie.

Get Universe Id From Place Id

Another API endpoint to retrieve a universeId(together with some other place information as well) is https://games.roblox.com/v1/games/multiget-place-details?placeIds=[PLACEID]. Although it requires authentication using a cookie/token unlike the solution given above. For the record, if anyone wants the universe id of their own game you don’t need any HTTP requests, it’s stored in the variable game.GameId.