Rate Shopping

Stop checking rates manually. We'll pick the cheapest.

ShipStation's rate calculator requires you to check each carrier one by one. ShipExtension compares all your carriers automatically and applies the cheapest rate — in bulk, without clicking.

  • Compare rates across all carriers automatically
  • Apply cheapest rate to orders in bulk
  • Works with FedEx, UPS, USPS, and all ShipStation carriers
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Order #4521 • 5 lbs • Zone 4
USPS Priority
2-3 days
$8.45
FedEx Ground
3-5 days
$9.82
UPS Ground
3-5 days
$11.23
Saving $2.78 on this order
Smart Express Optimization

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

📦
Customer pays for 2-day delivery
Standard approach: Use FedEx 2Day ($18.50)
🧠
ShipExtension checks transit times
FedEx Ground arrives in 1 day for this route
💰
Uses Ground instead — saves $10.50
Customer still gets it on time. You keep the margin.
$10-20
saved per express shipment
when ground meets the delivery promise

How It Works

Set it once, save on every shipment

1

Configure your carriers

Select which carriers and services to include in rate shopping. Set rules for express orders.

2

We compare rates

For each order, we fetch live rates from all carriers, check transit times, and find the best option.

3

Apply in bulk

Run rate shopping on all pending orders with one click. ShipStation is updated automatically.

Ready to stop overpaying for shipping?

Start with a free 14-day trial. No credit card required.

Start Free Trial Learn about Box Optimization