Live Shipping Rate at Checkout: Medusa x Perseuss

When we built Perseuss, we were focused on fulfillment. Cartonization. Optimization. Cost savings.

But shipping starts before the warehouse. It starts at checkout.

Most brands still rely on tiered shipping brackets. Easy to set up but terrible for accuracy. Some customers get overcharged. Others get freebies that destroy your margins. No one wins.

That’s what made this integration with Medusa such a great moment.

The Challenge with Tiered Shipping

Traditional tiered shipping models, while straightforward, often fall short in accuracy. They can lead to overcharging or undercharging customers, resulting in dissatisfaction and potential loss of revenue. As highlighted in discussions within the Shopify Community, customers appreciate transparency in shipping costs. Live rates provide accurate quotes upfront, enhancing customer satisfaction .

What We Did

Medusa plugged our API straight into their cart.

Now, when a customer hits checkout:

• The shipping rate is calculated in real-time

• It’s based on the actual weight, items, and delivery destination

• No more guesswork, no more tiers, no more margin leakage

And the best part? The integration was clean.

"You have our order data. You have our item data. We pass that to you, and you're passing it back to them. It's very seamless. Doesn’t require a lot of hands in the pot. Made the integration timeline really small."

Why This Matters

Shipping logic is usually buried deep in warehouse ops. But what if you surface it right where the customer makes their final decision?

Live rates feel fair. They're transparent. They help brands win trust and recoup costs.

This isn’t just a Medusa story. It’s a reminder:

You can use Perseuss to guide real-time packing decisions but you can also use it in the cart.

Checkout, fulfillment, packing, and rate logic finally talking to each other.

That’s how modern ops should feel.