# Kissmetrics Tracking API (Beacon)

**Canonical:** https://apis.io/apis/kissmetrics/tracking-api/  
**Provider:** Kissmetrics — https://apis.io/providers/kissmetrics/  
**Base URL:** https://trk.kissmetrics.io  
**Documentation:** https://support.kissmetrics.io/reference/api-specifications-1

Kissmetrics Tracking API (Beacon) is one of 2 APIs that [Kissmetrics](https://apis.io/providers/kissmetrics/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Analytics, Event Tracking, Data Ingest, and Identity Resolution. The published artifact set on APIs.io includes API documentation and a getting-started guide.

Event ingest surface. Three query-string endpoints record an event (/e), set person properties (/s) and irreversibly alias two identities to one person (/a), accepting GET or POST with the product key in `_k`, the person identity in `_p` and arbitrary additional keys as person properties. It powers the hosted JavaScript snippet, the first-party Ruby, PHP, Python, iOS and Android libraries, and the 1x1 pixel beacon used for email and ad impression tracking. By design it answers 200 OK with a 1x1 GIF to every request, valid or not, so a 200 is not evidence an event was accepted. This entry replaces the former Kissmetrics Data Out API entry, whose only documentation host, oldsupport.kissmetrics.com, no longer resolves (probed 2026-08-13).

## Machine-readable artifacts (5)

- **Documentation** — https://support.kissmetrics.io/reference/api-specifications-1
- **Beacon API** — https://support.kissmetrics.io/reference/beacon-api-1
- **GettingStarted** — https://support.kissmetrics.io/docs/installing-the-javascript-library-quickstart
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/kissmetrics/refs/heads/main/skills/kissmetrics-km-installer.md
- **SDKs** — https://raw.githubusercontent.com/api-evangelist/kissmetrics/refs/heads/main/packages/kissmetrics-packages.yml

## Other Kissmetrics APIs (1)

- [Kissmetrics REST API](https://apis.io/apis/kissmetrics/rest-api/)

## Tags

Analytics, Event Tracking, Data Ingest, Identity Resolution

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/kissmetrics/tracking-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/kissmetrics/.