Most of the APIs on websites are in your account settings.

Here are some screen shots.

This one is Binaryedge, you have to put name in the token bar and then you can get your API.

This is flickr API.

This is hashes.org

Shodan API.

These are just a few from the API list.

keys add flickr_api 7dhfyr67687dhhehde87878wed8w

Whoxy, pwnedlist, hibp, full contact and bing you need to pay for. Couldn’t access spyse at this time. The rest are free at the time as writing this.