What is Conversions API? Definition and how it works
What is Conversions API?
Conversions API is Meta's server-side tracking method. Instead of relying only on browser code, your server or CRM sends events like Lead, Schedule and Purchase straight to Meta with matching customer data. It recovers events lost to ad blockers and browser privacy limits and lets you send offline outcomes such as booked calls.
How Conversions API works
- A visitor converts on your funnel, and the Meta Pixel fires a browser event.
- Your server or CRM sends the same event to Meta through the API, with hashed customer details such as email and phone.
- Both events carry the same event ID, so Meta deduplicates them and counts the conversion once.
- Later outcomes, such as a booked call or closed sale in the CRM pipeline, are sent as additional events.
- Meta uses the fuller data to report results and optimize delivery toward people likely to convert.
Pixel vs Conversions API
| Meta Pixel | Conversions API | |
|---|---|---|
| Runs in | Visitor's browser | Your server or CRM |
| Affected by ad blockers | Yes | No |
| Offline events (calls, sales) | No | Yes |
| Setup effort | Low | Moderate |
Use both together, with deduplication, rather than choosing one.
Example: 31% more events recovered
On funnels where we added Conversions API alongside the Pixel, Meta recorded 31% more conversion events than with the Pixel alone. Just as important, sending booked calls and closed deals lets the campaign optimize for buyers instead of form fillers, which is how lead funnels keep a low cost per lead while lead quality rises.
The step-by-step setup is in our Conversions API setup guide.
Common mistakes
- No deduplication. Without a shared event ID, every conversion counts twice.
- Weak customer matching. Sending events without hashed email or phone lowers match quality.
- Sending only the Lead event. The value comes from sending deeper events such as Schedule and Purchase.
- Never checking Events Manager. Match quality and duplicate warnings show problems quickly.
We configure Pixel, CAPI and CRM events together in our Meta Conversions API setup service.
Related terms
Conversions API works alongside the Meta Pixel, reads outcomes from your CRM pipeline and directly affects cost per lead by improving what Meta optimizes for.
