Undocumented Hypothes.is Badge API (used by Chrome extension):
```python """ Return the number of public annotations on a given page.
This is for the number that's displayed on the Chrome extension's badge.
Certain pages are blocklisted so that the badge never shows a number on those pages. The Chrome extension is oblivious to this, we just tell it that there are 0 annotations. """ ```
https://hypothes.is/api/badge?uri=*
same as https://hypothes.is/api/search?limit=0&uri=*
.