Searchcaster

also if anyone has data that suggests otherwise, I'd be keen to see it! this question was inspired by looking at how Block centers their crypto business around BTC, and seems to be generating a ton of revenue from it: https://decrypt.co/151161/block-announces-increase-in-profit-year-over-year-in-q223-earnings

That's volume, they take 2% of that as revenue (before costs like fraud).