Update README.md

README.md

@@ -577,6 +577,7 @@ API | Description | Auth | HTTPS | CORS |
 | [npm Registry](https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md) | Query information about your favorite Node.js libraries programatically | No | Yes | Unknown |
 | [OneSignal](https://documentation.onesignal.com/docs/onesignal-api) | Self-serve customer engagement solution for Push Notifications, Email, SMS & In-App | `apiKey` | Yes | Unknown |
 | [Open Page Rank](https://www.domcop.com/openpagerank/) | API for calculating and comparing metrics of different websites using Page Rank algorithm | `apiKey` | Yes | Unknown |
+| [OpenAI GPT](https://platform.openai.com/docs/guides/gpt) | ChatGPT offers a chat interface to the models in the OpenAI API | `apiKey` | Yes | Unknown |
 | [OpenAPIHub](https://hub.openapihub.com/) | The All-in-one API Platform | `X-Mashape-Key` | Yes | Unknown |
 | [OpenGraphr](https://opengraphr.com/docs/1.0/overview) | Really simple API to retrieve Open Graph data from an URL | `apiKey` | Yes | Unknown |
 | [oyyi](https://oyyi.xyz/docs/1.0) | API for Fake Data, image/video conversion, optimization, pdf optimization and thumbnail generation | No | Yes | Yes |