You know that we can see from your comment history that you are the founder of blobr.io and that this question is a dishonest attempt at marketing it.
Right?
One option is RapidAPI [1], where you can provide your API and monetize it. They charge a somewhat hefty fee of 20% though. I'm curious if there are other services like this.
You can research CDPs like Segment.io, not API only, but close. The thing with selling APIs only is that business people tend to want to pay less for things they cannot see. So I would suggest a really good API with some UI for business users, there is a lot of data that requieres manual supervision anyway.