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Glossary · Measurement

What is Conversions API (CAPI)?

Conversions API is a method that sends conversion data to the ad platform directly from your server instead of the browser. Ad blockers and iOS privacy restrictions cause data loss in the browser pixel, so accounts without a CAPI setup lose visibility on a significant share of their conversions.

Detail

With CAPI in place the platform learns from more data, so optimization quality improves and reported conversions rise. The critical part of the setup is event match quality: hashing and sending fields like email, phone and city lifts the match rate markedly. Pixel and CAPI run together; an event ID must always be sent to prevent double counting.

Example

On an account using the pixel alone, 20%–35% of real conversions may go unreported.
FAQ

Common questions on this topic.

How is Conversions API (CAPI) calculated?

With CAPI in place the platform learns from more data, so optimization quality improves and reported conversions rise. The critical part of the setup is event match quality: hashing and sending fields like email, phone and city lifts the match rate markedly. Pixel and CAPI run together; an event ID must always be sent to prevent double counting.

Why does Conversions API (CAPI) matter?

With CAPI in place the platform learns from more data, so optimization quality improves and reported conversions rise. The critical part of the setup is event match quality: hashing and sending fields like email, phone and city lifts the match rate markedly. Pixel and CAPI run together; an event ID must always be sent …

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