Hey @andstatus, thank you for reporting this!

There are no changes planned in V2 regarding existing APIs so, if it isn't working and it was in a prior version, that means we have either accidentally added a bug or some plugin in the faulty instance is somehow interfering :-(

I've just tried requesting: https://loadaverage.org/api/statuses/mentions.json and authenticated myself via HTTP Basic Authentication with no issues.

Every GNU social installation has a doc concerning its APIs at instance.tld/doc/twitterapi, as seen, e.g., in: https://loadaverage.org/doc/api

If this problem is present in LoadAverage, please open an issue with instructions to reproduce this, so that we can further debug and get this fixed asap!; Otherwise, please ask the affected instance's sysadmin to open an issue requesting for help, so that we can assist them getting their instance back to normal :)

Our repository is available at https://notabug.org/diogo/gnu-social

Keep up the great work and thank you for supporting us! ^^