Halt now unsubscribes card-testing bots from Omnisend
LAS VEGAS, NV, October 30, 2026
Native Code has updated Halt: Card Testing Blocker so it unsubscribes card-testing bots in Omnisend, usually within seconds. Unsubscribed is the one status Omnisend does not bill, so a store stops emailing the bot and stops paying for it. The update is live for every store and included at no extra charge.
Halt: Card Testing Blocker now unsubscribes card-testing bots in Omnisend. The update is live for every store that uses Halt, and it is included at no extra charge.
Card testing is when a bot runs stolen card numbers through a store’s checkout to find the ones that work. Halt stops those checkouts before the card is charged. Stores on Omnisend now get the cleanup that Shopify Email and Klaviyo stores already had.
Why unsubscribed is the word that matters
Omnisend bills by contact. Subscribed and non-subscribed contacts both count toward the bill. Unsubscribed contacts do not.
So Halt sets every bot it stops to Unsubscribed, usually within seconds. The store stops emailing that contact and stops paying for it in the same move. The record itself stays in Omnisend, which is what lets Restore work later.
Omnisend’s Free plan covers 250 contacts, checked on October 30, 2026. Every bot contact that stays subscribed or non-subscribed uses one of those 250.
How a store connects it
On the Rules page, under Email list, a store picks Omnisend, pastes an API key and presses Connect. Halt checks the key before it saves it. The key is stored encrypted and is never shown back in full.
Restore puts back exactly what was there
Halt remembers what each contact was before it touched it.
Restore puts a real subscriber back to Subscribed. A contact that only existed because a bot typed it is left as not subscribed, so a real person subscribes by their own hand. Restoring a contact never triggers Omnisend’s welcome message.
Omnisend does not let a store re-subscribe somebody itself. Only the person can, or Halt’s Restore when Halt was the one that removed them.
A second look, ten minutes later
Omnisend’s own Shopify sync can put a bot back on the list minutes after Halt removed it. Halt looks at every Omnisend removal once more, ten minutes to a day later, and unsubscribes it again if that happened.
Every email list Halt now cleans
| Email list | How a store connects it | What Halt does |
|---|---|---|
| Shopify Email | One button, and one permission from Shopify | Unsubscribes the contact and tags it halt-bot |
| Klaviyo | The store pastes a key | Suppresses and unsubscribes the contact |
| Omnisend | The store pastes a key | Unsubscribes the contact |
| Any other tool | Nothing to connect | The halt-bot tag in Shopify lets the store filter those contacts out |
A store connects Shopify Email plus one of Klaviyo or Omnisend.
How the cleanup protects real customers
- Off until the store turns it on. Halt removes nothing from Omnisend until the store owner connects it.
- Only while protection is on. In watch mode Halt removes nothing.
- Everything can be undone. Restore puts a contact back with one click, and a real subscriber comes back as a subscriber.
- Nothing is hidden. Every removal is on the Removals page with the date, the list and the reason.
Why this update exists
A store owner wrote in to ask whether an Omnisend list could be connected, because only Klaviyo was showing. It was live the same day.
Tested end to end on a live Omnisend account before release: removal, restore, remove again, and the ten-minute re-check.
What Halt is seeing
In the 24 hours before this update went live, Halt stopped more than 2,000 bot checkouts across the stores that use it. Each one was stopped before any card was charged.
Price and availability
Halt is $6.99 a month with a 14-day free trial, and it is free on development stores. This update is included at no extra charge.
A store already running Halt can open the app, go to Rules, find Email list, choose Omnisend, paste the key and press Connect. The key comes from Omnisend: Store settings, then API, then Create API key. A new store can install Halt from the Shopify App Store, free for 14 days.