---
title: 'What is a conversions API? | Plainrouter'
description: 'An interface for sending conversion events from a server to a receiving platform.'
last_updated: 2026-10-09
---

# Conversions API

A conversions API is an interface for sending conversion events, such as purchases or leads, from a server to a receiving platform. It is a transport contract, not a guarantee of attribution or delivery. For Meta's implementation, see [how Meta Conversions API works](/library/meta-conversions-api).

## What does Meta's Conversions API aim to do?

Meta’s Conversions API connects event data from sources such as servers, website platforms and CRMs to Meta so advertisers can measure and optimize advertising. It supplements permitted browser signals; sending an event does not itself prove attribution or an incremental sale. See [how Meta Conversions API works](/library/meta-conversions-api).

## Is Meta Conversions API the same as Plainrouter's API?

No. Meta Conversions API is a destination interface. Plainrouter's versioned Conversion API accepts first-party events and exposes its own ingestion and delivery contracts.

## Does an accepted request prove provider delivery?

No. Acceptance and provider delivery are separate states. Check delivery evidence and any provider response rather than treating ingestion success as completed delivery.

## How do browser and server copies avoid double counting?

Use a consistent event identity for the same logical event and follow the destination's deduplication contract. For Meta, consult the event_id deduplication guide.

For the choice between browser and server channels, compare [Conversions API vs Meta Pixel](/library/conversions-api-vs-meta-pixel). For browser setup, follow [how to find your Meta Pixel ID and install the Pixel](/library/meta-pixel).

## Related reading

- [Meta Conversions API: how it works and how to set it up](/library/meta-conversions-api)
- [How Meta event_id deduplication works](/library/meta-event-id-deduplication)
- [All definitions](/definitions)
- [Signals](/product/signals)
- [Actions](/product/actions)
- [Implementation guides](/library)
- [API documentation](https://plainrouter.com/docs/api/conversions)