FYI This appears to be a bug introduce today in the v2 Wanikani api at or after 10:30am PST. Here are reproduction steps:
curl -H 'Authorization: Token token=<api-v2-key-for-hitechbunny>' 'https://www.wanikani.com/api/v2/assignments?page=2'
responds:
{
"object":"collection",
"url":"https://www.wanikani.com/api/v2/assignments",
"pages":{
"next_url":"https://www.wanikani.com/api/v2/assignments?page=2",
"previous_url":null,"last":8,"current":1}, ...
},
...
}