Rate shopping that starts with the right box.
ShipStation's Rate Shopper picks the lowest-cost service for the package already on the shipment. ShipExtension decides the package first — then compares every service across every carrier account you own and applies the lowest-cost eligible one, in bulk. It runs as one step inside your automation rules, and pairs with box optimization so you're shopping rates for the smallest box that actually fits.
- Decide the right box first, then compare every carrier account automatically
- Apply the lowest-cost eligible service to orders in bulk
- Works with FedEx, UPS, USPS, and all ShipStation carriers
Stop overpaying for air when ground arrives on time
When customers pay for 2-day shipping, you don't always need to use 2-Day Air. If FedEx Ground will arrive in 1 day anyway, why pay the premium?
Example: NY → NJ Shipment
How It Works
Set it once, save on every shipment
Configure your carriers
Select which carriers and services to include in rate shopping. Set rules for express orders.
We compare rates
For each order, we fetch live rates from all carriers, check transit times, and find the best option.
Apply in bulk
Run rate shopping on all pending orders with one click. ShipStation is updated automatically.
Doing it in ShipStation vs ShipExtension
Getting the lowest-cost eligible service on every order
ShipStation
Rate Shopper picks the lowest-cost service for the package already assigned to the shipment — it doesn't compare package types or decide which box a multi-item order needs
ShipExtension
Decide the box first, then rate-shop every service across all your carrier accounts and apply the lowest-cost eligible one in bulk — with a per-order audit trail
ShipStation's own documentation notes Rate Shopper "only compares services. It does not compare different package types" (help article 4415714484123), and that automation rules matching Item SKU "will only apply to orders containing a single unique line item" (help article 1260807687290), as of July 2026.
FAQ
ShipStation rate shopping FAQ
- Can ShipStation compare carrier rates automatically?
- Yes — ShipStation's Rate Shopper can automatically pick the lowest-cost service, but only for the package already assigned to a shipment. ShipStation's own documentation (help article 4415714484123) notes Rate Shopper "only compares services. It does not compare different package types." ShipExtension decides the package first — which box (or boxes) a multi-item order physically fits — then rate-shops every service across all your connected carrier accounts and applies the lowest-cost eligible one in bulk, with a per-order audit trail.
- Does ShipExtension rate-shop across multiple carrier accounts?
- Yes. It compares live rates across all of your connected accounts — USPS, UPS, FedEx, and more — and can rate-shop per service, so each order gets the best-priced option you allow.
- How is this different from ShipStation's built-in rate calculator?
- ShipStation's Rate Shopper can now pick the lowest-cost service automatically, but it only compares services for the package already on the shipment — it doesn't decide which box a multi-item order needs, and native SKU rules skip multi-item orders entirely. ShipExtension decides the package first, rate-shops every service across all your carrier accounts as part of your automation rules, and re-runs whole batches after import — so the lowest-cost eligible service is selected without anyone comparing rates by hand.
- Will rate shopping use my own negotiated rates?
- Yes. Rate shopping runs on the carrier accounts you connect, so it uses your negotiated rates and keeps every carrier relationship intact. ShipExtension picks between the rates you already have.
- Can I control which carriers and services it chooses?
- You can. You decide which carriers and services are eligible and set per-service filters, so rate shopping only ever selects options you've approved for that order.
Last reviewed July 17, 2026. ShipStation capabilities and pricing cited from ShipStation's help center and pricing page as of July 2026.
Related comparisons
ShipStation Rate Shopper vs ShipExtension
Where ShipStation's native Rate Shopper stops — single-package assumptions, one carrier account — and what package-first, cross-account rate shopping adds on top of it.
ShipStation Rate Shopper and package types
Rate Shopper does not compare package types. What people do instead, and how ShipExtension picks the box before rating.
ShipStation automation rules, extended
The rule conditions ShipStation's built-in engine can't express, including multi-SKU matching and weather logic.
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Your first workflow
Technical details
- The recurring task
- Staff compare eligible shipping services after choosing packaging. ShipExtension can request rates and apply a configured eligible choice.
- Representative input and result
- A shipment with destination, weight and dimensions is evaluated against your eligible services and connected carrier accounts.
- Information needed
- Carrier accounts, service restrictions, package dimensions, weight, destination and billing configuration.
- Verification and limitations
- Rule Dry Run describes rate shopping but does not fetch a verified winning quote. Use assisted verification before enabling it. API errors or unavailable rates need review; do not assume a cheapest rate is always returned.
- ShipStation API scope
- V1 supplies orders; V2 rate and shipment operations require the corresponding token. Confirm eligibility and the selected write path during setup.
- Subscription and setup
- Automate: $179/month for up to 2,000 orders. Optimize: $499/month for up to 10,000 orders. Packing slips are a separate add-on. Initial setup help is available; custom implementation scope is confirmed separately.
Total processing includes fetching orders and any API operations. Time varies with batch size, actions and API pacing; no fixed completion time is guaranteed.