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Im not entirely sure if this is a fit for your specific use case, but take a look at JSON Web Tokens (JWT). The are most commonly used in the context of OAuth but could work here. You generate the tokens with a private key or a secret and hand it to your clients (for example as the response to the form that was suggested already). He passes the token to you on each request, you verify its validity and send back the content. JWT features expiration time so that would be taken care of.
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Hence, a higher number means a more popular project.