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Calculated rates — percentages, incremental rates, summed metafields, blended totals — have no natural ceiling. Maximum and minimum limits bound the result so a large or unusual cart can’t produce an absurd shipping price.

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Where to find it

Limits live on the app’s Settings page, under Blending → Basic.
The control only appears when basic blending is set to Add rates. With Show the highest rate only or Show the lowest rate only selected, the option is hidden and limits do not apply.If you can’t find the setting, this is why.

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Setting limits

1

Set basic blending to Add rates

On the Settings page, under Blending → Basic.
2

Turn on Set limits while adding rates

A table appears.
3

Add an entry per shipping method

Give the method name and a Maximum, a Minimum, or both. Add more entries with Add.
4

Save

Each entry needs a method name and at least one of maximum or minimum — an incomplete row prevents the settings saving.

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Why a maximum matters

A percentage rate on a large order, or an incremental rate on a bulk purchase, can produce a shipping charge far above what the shipment actually costs you.

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Why a minimum matters

A minimum protects against the opposite failure — a rate calculating to near zero because of a small order, a discount, or a product with missing data. Common reasons a rate comes out too low:
  • A percentage rate on a very small cart
  • A metafield rate where products have no value set and the default rate is low
  • Add-rates blending where only one small contributing rule matched

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Method names must match

Limits are applied per shipping method name, matched against the rate name shown at checkout.
If the method name in your limit doesn’t match the rate name exactly, the limit silently does nothing. Copy the name from the rate rather than typing it from memory, and re-check after any rate rename.

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Testing

Limits only reveal themselves at the extremes, which are exactly the carts you’re least likely to try by accident.
  1. Build a cart large enough to exceed your maximum — confirm the capped figure
  2. Build a minimal cart — confirm the floor engages
  3. Confirm the method name matches by checking a normal cart still prices as before

Rate blending

Why limits are tied to Add rates.

Percentage rates

The rate type that most needs a cap.

Incremental rates

The other unbounded rate type.

Rates from metafields

Where a floor protects against missing data.