The API documentation URLs are region-specific. For example:

https://eastus.dev.cognitive.microsoft.com/docs/services/TextAnalytics.V2.0/operations/56f30ceeeda5650db055a3c7

OR

https://westcentralus.dev.cognitive.microsoft.com/docs/services/computer-vision-v3-ga/operations/5d986960601faab4bf452005

I have been able to find one root URL for all APIs:

https://dev.cognitive.microsoft.com/docs/services/

But the above URL does not appear in any search results, either in Google or even in Bing. Also, there are no links to it from any of the landing pages for Cognitive Services.

An API directory for Cognitive Services that is independent of regions would be welcome.