Add isEven API

README.md

@@ -734,6 +734,7 @@ API | Description | Auth | HTTPS | CORS |
 | [GBIF](https://www.gbif.org/developer/summary) | Global Biodiversity Information Facility | No | Yes | Yes |
 | [iDigBio](https://github.com/idigbio/idigbio-search-api/wiki) | Access millions of museum specimens from organizations around the world | No | Yes | Unknown |
 | [inspirehep.net](https://inspirehep.net/info/hep/api?ln=en) | High Energy Physics info. system | No | Yes | Unknown |
+| [isEven (humor)](https://isevenapi.xyz/) | Check if a number is even | No | Yes | Unknown |
 | [ITIS](https://www.itis.gov/ws_description.html) | Integrated Taxonomic Information System | No | Yes | Unknown |
 | [Launch Library 2](https://thespacedevs.com/llapi) | Spaceflight launches and events database | No | Yes | Yes |
 | [Minor Planet Center](http://www.asterank.com/mpc) | Asterank.com Information | No | No | Unknown |