SLSmartletter API

Stats

Audience growth and sending volume.

get/stats/overview— Overview

Active subscribers, new subscribers and unsubscribes per day over the last 30 days, and emails sent.

Keys: full_access

curl -X GET https://api.smartletter.ai/stats/overview \
  -H "Authorization: Bearer $SMARTLETTER_API_KEY"

Response 200

{
  "object": "overview",
  "subscribers": {
    "active": 1520,
    "new_last_30_days": 210,
    "unsubscribed_last_30_days": 12
  },
  "daily": [
    {
      "date": "2026-10-17",
      "new_subscribers": 9,
      "unsubscribed": 0,
      "emails_sent": 0
    }
  ],
  "emails": {
    "sent_this_month": 4800,
    "sent_last_30_days": 6100,
    "newsletters_sent_last_30_days": 4
  }
}