Conversion API (CAPI)
Definition
A server-side event tracking integration that sends conversion signals directly from an advertiser's server to Reddit's API, bypassing browser-based limitations such as ad blockers, cookie restrictions, and Apple's App Tracking Transparency framework.
Context
Reddit recommends pairing CAPI with the Reddit Pixel as complementary layers — Pixel captures browser events, CAPI confirms server-side events. Together they provide the highest signal fidelity. Brands that rely solely on the Pixel are increasingly working with incomplete data, particularly for iOS users after Apple's ATT framework took effect.
Relevance to Reddit
CAPI is the most reliable conversion tracking method available on Reddit. For any program optimizing toward lower-funnel outcomes, implement CAPI before campaigns launch. It provides a more complete and durable signal than the Reddit Pixel alone, which degrades as browser-based tracking becomes less reliable across devices.
