API that provides access to a collection of thousands of riddles (and growing). Fetch a random riddle or a riddle of the day. You can build a perfect app to entertain kids and families for dinner times. You can also pull riddles by their ID, difficulty level and keyword of your interest. API also collects feedback such as upvotes, and flags to fine-tune the library of riddles. I will constantly be adding more riddles to the API as I come across them.
The Basic plan is completely FREE with a handful number of calls per month for those who build personal websites with decent traffic. You should be able to subscribe to it without any payment information.