What are some interesting APIs (free or paid) available to anyone

You may find this useful: https://github.com/public-apis/public-apis

For my most recent projects, I've been building API systems and implementing them with WordPress plugins. What I've noticed of APIs is that you often have to build your own library from the code they supply. So I build the library, keep it up to date, and just provide all the command lines and code to make it easier.

I'm sure many devs still prefer to clone their own Git libraries, but I remove that step so its simple setup and the rest is just plug-and-play.

Basically, you can use the API service to build your own web apps. So far, I've had an official collaboration with BunnyCDN and an unofficial collaboration with DreamHost.

https://bunnyapi.com for BunnyCDN

I'm still working on this one, but it's nearly complete.

https://dreamapi.link for DreamHost's DreamObjects.

I'll probably create one purely for AWS as well. For WordPress users, it's quite helpful when there's no existing plugins.

OpenStreetMap: https://wiki.openstreetmap.org/wiki/API

I work as a dev for a company that provides services for hotels. For me, the best API which we discovered this year was a CRUD API for handling i18n keys in our system. We were using our in-house solution to keep translation keys in SQL together with translations. The support team was maintaining the translations, and we as a dev team were responsible for translation keys and own translation editor. This year my colleague found an app called SimpleLocalize which provides a simple CRUD API, and translation editor for a fairly good price (important factor due to COVID). We removed our submodule for translation management (which was buggy as hell) and switched totally to the simple CRUD. Feels good man. We cut 1/10 of code which was mainly used by our translation management.

The Bruzu Image API returns an image in response to a URL GET request. check https://bruzu.com

Zillow has some interesting APIs: https://www.zillow.com/howto/api/GetSearchResults.htm

Spotify (https://developer.spotify.com/) exposes a lot of interesting data via their API!

Cat API is pretty cool https://thecatapi.com/