area: listverify
action: uploadlistbyurl
https://api.hypermail.com/api.php?apikey=YOURAPIKEYHERE&area=listverify&action=uploadlistbyurl&url=https://yoursite.com/mydata.csv
<response>
<importid>29877</importid>
<listid>33967</listid>
<status>Processing</status>
</response>
{
"importid": "29877",
"listid": "33967",
"status": "Processing"
}