Sure! Here are some ideas to get you started:

1. Check out api nijas they have some simple REST APIs to fun data! (https://api-ninjas.com/)
2. Try creating a playlist of your favorite songs on spotify (https://developer.spotify.com/documentation/web-api/tutorials/getting-started)
3. Spin up some cloud resources on vultr (https://www.vultr.com/api/)

These are all using REST APIs, but remember that there are other kinds of APIs such as the POSIX compliant APIs or the Win32 API, just to name a few.
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