I tested it using the api on this instance /api/v3/post/like and I was unable to downvote any post. I also tried /api/v3/comment/like and it would also fail due to {"error":"downvotes_are_disabled"}⏎ .

I made sure to try and downvote a comment/post on an instance with downvotes enabled.

Not sure why people are saying you can, unless I've completely screwed this up, but it seems that downvotes don't work at all via the api if it's disabled.

curl --request POST \
     --url https://vegantheoryclub.org/api/v3/post/like \
     --user-agent "Mozilla/5.0 (X12; Linux x86_128) Gecko/19840101 0.821/xoferiF" \
     --header 'authorization: Bearer REDACTED ' \
     --header 'content-type: application/json' \
     --data '
{
  "score": -1,
  "post_id": 362154
}
'

!vegan@vegantheoryclub.org