Cannot access Thesaurus endpoint

I am receiving Authentication failed when I make requests to the Thesaurus endpoint. Following is an example:

curl -X GET --header 'Accept: text/plain' --header 'app_id: xx' --header 'app_key: xx' ''

However, the call to the Entries endpoint works just fine. I have checked the app_id and the app_key multiple times and they are correct. I am currently on the Prototype plan. Does one need to be on some other plan to access the Thesaurus endpoint?


  • TaisFukushimaTaisFukushima Member, Administrator, Moderator admin

    Hello @sthakur431

    Prototype plan has access to API basic functionalities only, which are Entries and Lemmas. To be able to use other endpoints we recommend you to update your account.The Developer plan which gives you access to all data.

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