Cannot access Thesaurus endpoint
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[Action required] API changes announcement for existing customers
Note: This announcement applies to API customers that are registered to a Prototype and Developer plans.
Hello all!
We are writing to inform you that a new set of plans is replacing our current application plans (Prototype and Developer plans) and prices.
As of 10th May 2022, the Prototype and Developer plans will no longer be operational. Oxford Dictionaries API will offer two new plans:
- Introductory plan
- Unlimited plan
For Prototype and Developer plan customers, changes are happening between 12th April 2022 and 10th May 2022. So do not worry! You will have time to check the options and choose how you wish to proceed using our data by selecting the Introductory or Unlimited plan.
For further instructions on how to change plans, and for more information, please visit our new plans announcement page.
Link: https://developer.oxforddictionaries.com/new-plans-announcement
If you have any questions, please feel free to leave us a comment or reach us at our Contact Us page. (https://developer.oxforddictionaries.com/contact-us)
The Oxford dictionaries API team
Note: This announcement applies to API customers that are registered to a Prototype and Developer plans.
Hello all!
We are writing to inform you that a new set of plans is replacing our current application plans (Prototype and Developer plans) and prices.
As of 10th May 2022, the Prototype and Developer plans will no longer be operational. Oxford Dictionaries API will offer two new plans:
- Introductory plan
- Unlimited plan
For Prototype and Developer plan customers, changes are happening between 12th April 2022 and 10th May 2022. So do not worry! You will have time to check the options and choose how you wish to proceed using our data by selecting the Introductory or Unlimited plan.
For further instructions on how to change plans, and for more information, please visit our new plans announcement page.
Link: https://developer.oxforddictionaries.com/new-plans-announcement
If you have any questions, please feel free to leave us a comment or reach us at our Contact Us page. (https://developer.oxforddictionaries.com/contact-us)
The Oxford dictionaries API team
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' 'https://od-api.oxforddictionaries.com/api/v2/thesaurus/en/tenacious?fields=synonyms&strictMatch=false'
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?
Answers
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.