Update README.md

README.md

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-[APILayer](https://apilayer.com/) is the fastest way to integrate APIs into any product. They created this repository to support the community in easily finding public APIs. Explore their collections on the [Postman API Network](https://www.postman.com/apilayer/workspace/apilayer/overview).
+[APILayer](https://apilayer.com/?utm_source=Github&utm_medium=Referral&utm_campaign=Public-apis-repo) is the fastest way to integrate APIs into any product. They created this repository to support the community in easily finding public APIs. Explore their collections on the [Postman API Network](https://www.postman.com/apilayer/workspace/apilayer/overview).
 
 ### APILayer APIs
 | API | Description | Call this API |