curl --request POST \
  --url https://{host}/extern/fe/auth/challenge \
  --header 'Content-Type: application/json' \
  --header 'X-Publishable-Key: <api-key>' \
  --data '
{
  "address": "0x1234567890abcdef1234567890abcdef12345678"
}
'

const options = {
  method: 'POST',
  headers: {'X-Publishable-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({address: '0x1234567890abcdef1234567890abcdef12345678'})
};

fetch('https://{host}/extern/fe/auth/challenge', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{host}/extern/fe/auth/challenge"

payload = { "address": "0x1234567890abcdef1234567890abcdef12345678" }
headers = {
    "X-Publishable-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

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

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}

{
  "status": "error",
  "code": "INTENT_WRONG_STATUS",
  "message": "Session must be in OPEN status for this action."
}