There are many different SEO API services however they are not all exactly the same as a lot goes into defining what an SEO API would entail. The most important thing for an SEO API provider would be to consider what set of tools would be in demand as well as what varieties of SEO data a search engine optimizer would be interested in.
And, as an SEO expert who works with various SEO tools and data types, you would be interested in going for an SEO API service that can cater to your requirements by including the vast majority of tools, if not all, that you would be interested in using on a day-to-day basis. SEO API services would be for depending upon what sorts of that are there could be providing you away.
While the vast majority of SEO API services would have a number of things in common, there would definitely be certain elements that would set them apart. What this means is that you cannot simply be going for just about any SEO API and consider it to be good enough for your requirements. Instead, you will have to compare and identify an SEO API service that will effectively cater to your requirements.