curl --request POST \
  --url https://{host}/extern/fe/auth/challenge \
  --header 'Content-Type: application/json' \
  --header 'X-Publishable-Key: <api-key>' \
  --data '
{
  "address": "<string>"
}
'

{
  "status": "<string>",
  "data": {
    "message": "<string>",
    "nonce": "<string>"
  }
}