# _kx — Klaviyo's per-recipient engagement token

- Canonical: https://linkclean.app/trackers/kx/
- Updated: 2026-07-20
- Author: Ken Tominaga (https://ken0nek.com)
- Get the app: https://apps.apple.com/us/app/linkclean/id6758604043

Parameter: `_kx` · Category: Email marketing · Vendor: Klaviyo

> _kx is **Klaviyo's per-recipient engagement token** — Klaviyo is the dominant marketing-automation platform for direct-to-consumer e-commerce. _kx is tied to the specific subscriber. Behaves like mc_eid, mkt_tok, or _hsenc in privacy terms.

## What _kx ties together

Klaviyo pairs email and SMS marketing with Shopify, BigCommerce, and other DTC commerce stacks. _kx is the URL-side token Klaviyo uses to bind a click back to the specific subscriber it sent the email to — the join lets Klaviyo's tracking attribute the eventual purchase to a particular subscriber-record.

Same identity-bound shape as the other per-recipient email IDs (mc_eid for Mailchimp, mkt_tok for Marketo, _hsenc for HubSpot). Different vendor, same risk profile.

## How LinkClean removes it

Default-on in the email-marketing catalog.

## Example

Looks like this in a URL: `https://example.com/product?_kx=Ab1Cd2Ef3Gh4Ij5Kl6Mn7Op8Qr9St0`

After LinkClean: `https://example.com/product`

## Frequently asked

**Is _kx identity-bound?**

Yes — per-recipient. Joins back to Klaviyo's subscriber record, keyed to the subscriber's email or phone.

**Where does _kx show up most?**

On outbound links from DTC e-commerce email and SMS sends — Klaviyo dominates that segment. If a Shopify store emails you a promo, _kx is the token tying your click back to your subscriber profile.


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