The owner of SerpApi.com posts here. The api allows for searching popular indexes and getting the data back in JSON format. Developer friendly product, of course. Not sure you'll get such detailed information about operations, but an interesting question. Perhaps the future for all of us, is APIs.
I think the secret is building an api that on its own is a true niche offering. It would fit within an app that you can imagine others might build. That is key. A given feature of this mythical app, but be solved by the api. But solving a problem so complicated on its own, that someone would venture to not do it themselves, in a weekend.
Such is the case I suspect with SerpApi and Stripe, and the like. I've used a certain SQL layer, and considered crypto api layers before. Perhaps think about those domains?