Keep getting error:"Bad request, please read our documentation"

Question

error:"Bad request, please read our documentation"

I am testing the endpoint after u have subscribed but it is not working

API Datacenter · Answer

After coordinating with RapidAPI, this issue was being caused by and old feature that is no longer available in the new design of RapidAPI. This issue is now resolved.

bastelg · Answer

I have the same problem. In the basic /free pricing model it worked just a few minutes ago and then I subscribed to the Pro-plan (10$) and now I get the same error and nothing works anymore. 
Was / is there some resolution to this problem?

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Keep getting error:"Bad request, please read our documentation"