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Likely cause: The destination’s API rate limit is being hit, causing Upstack to throttle or drop events. This is more common during flash sales or high-traffic events. Fix:
  1. Check the destination’s Event Log in Upstack for rate-limit errors (HTTP 429 responses).
  2. If you see 429 errors, Upstack automatically retries with backoff — most events will be delivered within 30 minutes.
  3. For sustained high-traffic stores, consider upgrading your destination platform’s API tier:
    • Meta: Standard access tokens support up to 2,000 events/hour. Request Advanced Access in Meta Business Settings for higher limits.
    • TikTok: Contact your TikTok rep to increase API quota.
  4. Check your Upstack plan — some plans have monthly event forwarding limits. Go to Settings → Subscription to see your usage. View plans and pricing if you need to upgrade.
Still stuck? Contact support@upstackdata.com with your Pixel ID and a description of the issue. We typically respond within a few hours.

Upstack shows higher event counts than the destination

Why deduplication differences cause a small, expected gap between platforms.