curl -X GET "https://api.mailofly.com/api/v1/usage?days=30" \
  -H "Authorization: Bearer mf_live_your_api_key"

{
  "data": {
    "periodDays": 30,
    "emailsSent": 12850,
    "delivered": 12790,
    "bounced": 60,
    "activeContacts": 4500,
    "domains": 3,
    "limits": {
      "emailsPerMonth": 50000,
      "domainsAllowed": 10,
      "rateLimitPerSecond": 10
    }
  }
}