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Setup Updated Aug 16, 2026

What Nex Validator does

Nex Validator sets minimum and maximum limits on cart quantity, cart value, products and collections, then blocks checkout when a cart breaks one. It runs as a Shopify Function, so it also covers Shop Pay and express checkouts.

Applies to
  • All Shopify plans — Plus is not required
  • Online checkout, Shop Pay and express checkouts
Doesn't apply to
  • Shopify POS
  • Setting prices or creating discounts

Shopify has no native way to require a minimum order. No minimum cart value, no minimum quantity, no per-product purchase cap. Nex Validator adds them.

What you can limit

ScopeLimit on
CartTotal quantity, or total value
ProductQuantity of a specific product
CollectionQuantity across a collection

Each takes a minimum, a maximum, or both. Full list in Order limits.

How a limit is enforced

When a cart breaks a rule, checkout is blocked and the customer sees the message you wrote. They cannot pay until the cart is fixed.

Two layers, and only one is automatic

Checkout blocking works as soon as a rule is active. Separately, the app can also lock the quantity selector on your storefront so customers cannot pick an invalid quantity in the first place.

That second layer needs the theme app embed enabled, and it is driven by product metafields rather than by the rule itself. It is the part merchants most often expect to happen automatically, and are surprised when it does not.

See how enforcement works for the full picture, and install to turn the embed on.

What it does not do

  • Set prices, create discounts or change shipping rates
  • Run in Shopify POS
  • Hide or remove products from your storefront

Next

  1. Install and enable the app embed
  2. Create your first limit
  3. Browse all the limit types

Frequently asked

Do I need Shopify Plus?

No. Validation works on every Shopify plan — Basic, Shopify, Advanced and Plus.

Can customers get around the limit?

Not by going straight to checkout. Because the rule runs as a checkout validation function it applies to Shop Pay, express checkouts and direct checkout links, not just the cart page.

Does it change prices?

No. It only decides whether a cart is allowed to check out. Prices, discounts and shipping rates all stay in Shopify.

See also: Install and enable the app embed · Create your first limit · Order limits