Try Azuqua, I was their remote employee when they were raising their series C, albeit I wasn't cut out to handle their amazing product at the time when I was just fresh out of college, so we later parted ways. They were acquired by Okta, so I don't know their status now, but you could have a call with their sales team and work out a decent pricing or custom APIs for your product needs. https://azuqua.com/