curl --request POST \
  --url http://localhost:4000/v1/users \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "username": "fallback_user_123abc",
  "address": "0x123abc456def789012345678901234567890abcd",
  "email": "john@example.com"
}
'

{
  "id": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "username": "john_doe",
  "id_x": 12345678,
  "created_at": "2024-05-12T13:47:00.000Z",
  "updated_at": "2024-05-13T10:00:00.000Z",
  "address": "0x123abc456def789012345678901234567890abcd",
  "privy_id": "privy-did:123abc456def789012345678901234567890abcd",
  "privy_address": "0x456def789012345678901234567890abcdef123",
  "thirdweb_address": "0x789abc012345678901234567890abcdef123456"
}