Is it possible to obtain consent rates for specific vendors, URLs, or purposes?

No, we don't have an internal dashboard in our Analytics Section. However, you can review the Consent Personalization data under the Domains & Apps tab; specifically, the "Personalization Rate." 

Please note that this data typically falls below 2%. Alternatively, you can utilize our events explained in this documentation https://developers.didomi.io/cmp/web-sdk/reference/events#preferences-clickpurposeagree to incorporate these figures into your own tool.

Finally, you could subscribe to our premium functionality Batch Export and compute the data on your side.