So, you may be wondering what companies and data stores have API’s that you may be able to utilize? For most companies and products, if you search their website, you should be able to find a “developer” section. Typically, if the company has an available API, they will list it in this area.
Companies want developers to use their API’s. It gives more value to their product, allows them to collect additional data, and serves as free marketing for their product. It is typically within their interests to do make something available.
For an idea of what types of companies have available API’s, you can check out the following resource, which lists known API’s.