Multi-Carrier Shipping Software
One API. 100+ carriers. AI-powered rate shopping that saves teams an average of 15% on shipping costs.
Trusted by 100,000+ shippers, including eBay, Walmart, Carhartt, and Petco.
Definition
Multi-carrier shipping software connects your fulfillment operation to multiple carriers — USPS, UPS, FedEx, DHL, regional networks, same-day, and cross-border providers — through a single platform. Instead of maintaining separate integrations, contracts, and rate tables for each carrier relationship, your team gets one place to compare rates in real time, generate labels, and make carrier decisions at scale.
If you're managing more than one carrier today, you already know the friction. Separate API integrations that need maintenance every time a carrier updates their specs. Rate shopping that happens during contract negotiations instead of at the moment of label generation. And when a carrier fails during peak, most systems have no automatic fallback — leaving your team scrambling for manual fixes on the days it matters most.
On the engineering side, adding a new carrier usually means a new integration project. Separate credentials, separate documentation, separate testing cycles — every time. For operations teams, it means waiting on eng to flip a switch that should take an afternoon.
Single-carrier dependency is rarely a deliberate choice. It's usually what happens when the infrastructure to manage multiple carriers is too expensive to build and maintain in-house — when your team finally runs out of time to revisit it.
One integration
Managing separate API connections to each carrier is technical debt that compounds. A new regional carrier requires new development work. A carrier that changes their API spec requires a maintenance sprint. At five carriers, you have five integrations to maintain — and that's before peak season, when every engineering hour matters.
EasyPost replaces all of it with a single API integration. Connect once and access 100+ carriers without writing or maintaining carrier-specific code. Adding a new carrier is a configuration change, not a development project.
Luma AI
Most teams do rate analysis once a quarter, when they're negotiating contracts. In between, they're selecting carriers based on rules that were set up months ago — and haven't been revisited since.
Luma AI runs that analysis on every shipment, at the moment you generate a label. It evaluates cost, transit time, carrier reliability, and your defined business rules — then selects the best carrier and service level automatically. No manual comparison. No defaulting to the same carrier out of habit.
Luma AI is trained on 1B+ historical shipments, which means its selection logic reflects real carrier performance across zones, weights, and delivery windows — not just published rate tables. Shippers using Luma AI see an average of 15% cost savings.
Reliability
Peak season stress-tests every part of your shipping operation — and it's exactly when platform downtime hurts most, when you're shipping 5x your normal daily volume and every label generation failure is a delayed order.
EasyPost is the only multi-carrier shipping platform with documented 99.99% uptime through consecutive peak seasons — including the 2020 pandemic surge, when EasyPost held uptime through a 600% spike in daily deliveries for the world's largest retailer. Client libraries in C#, Go, Java, Node.js, PHP, Python, and Ruby.
How it works
One integration replaces every individual carrier connection. Your team integrates once; EasyPost handles carrier-specific logic, credential management, and spec updates behind the scenes.
Set your carrier preferences, service level thresholds, and cost targets. Define fallback logic so if one carrier misses a rate, another steps in automatically. No manual intervention required.
From the first label, Luma AI analyzes your shipment data against carrier performance history to surface the best-value option for each package — with reporting on cost trends, no manual comparison logic.
Who it's for
When your volume hits the ceiling on single-carrier rates, the answer isn't renegotiating one contract — it's access to a network of alternatives, selected automatically. Access pre-negotiated rates up to 88% below retail through Wallet Carriers, or connect your own carrier accounts.
Managing carrier accounts across multiple clients is a different problem than managing your own. EasyPost supports multi-client carrier management — one platform for carrier access, rate logic, and reporting across client accounts, without building separate integrations per client.
At millions of shipments per year, carrier selection consistency matters as much as carrier access. Luma AI applies the same selection logic at label 1 and label 1,000,000 — with 99.99% uptime, libraries in every major language, and the reliability that 24/7 fulfillment requires.
"The biggest impact has really been on our actual shipping cost, because before we started using EasyPost, we weren't rate shopping… EasyPost has been a dream to work with."
Trusted by 100,000+ shippers since 2012
Use our shipping rate simulator to see what your carrier mix should actually cost — based on your volume, zones, and current carrier setup.
FAQ
Multi-carrier shipping software connects shippers to multiple carriers — USPS, UPS, FedEx, DHL, regional networks, and same-day providers — through a single platform, eliminating separate integrations for each carrier relationship. Operations teams use it to compare rates in real time, generate labels, automate carrier selection, and manage carrier performance from one place. EasyPost supports 100+ carriers through a single API integration.
The right platform depends on your volume, carrier mix, and whether you need AI-powered carrier selection or basic rate comparison. EasyPost is purpose-built for mid-market and enterprise operations: 100+ carrier integrations, Luma AI trained on 1B+ shipments, and 99.99% uptime through consecutive peak seasons. For teams shipping 10,000+ labels per month with more than one carrier, EasyPost provides the infrastructure and intelligence to manage that complexity at scale.
Rate shopping software queries multiple carriers the moment a label is generated and returns the best available rate based on your defined criteria — cost, transit time, carrier preference, or service level. Basic rate shopping compares published rates. EasyPost's Luma AI goes further: it factors in historical carrier performance across 1B+ shipments, your specific shipment characteristics, and your business rules to select the optimal carrier — not just the cheapest rate, but the best value for that shipment.
EasyPost's Shipping API gives your engineering team a single integration point for all carrier connections. Instead of building and maintaining separate integrations for each carrier, you connect once to EasyPost and get access to 100+ carriers through one API. Adding a new carrier requires no additional development work — it's a configuration change, not a build. EasyPost manages credential handling, spec updates, and billing consolidation behind the scenes.
If your team manages more than one carrier, ships 10,000+ labels per month, or spends engineering time maintaining carrier integrations, multi-carrier shipping software will reduce both cost and overhead. EasyPost serves commercial shippers from mid-market ecommerce operations through enterprise logistics teams processing millions of shipments annually. Not sure whether the savings justify the switch? Run your volume through the rate simulator to see the gap between what your current setup costs and what it should cost.
Keep exploring
99.99% uptime through every peak season since launch — including a 600% pandemic volume surge.
See the record →Wallet Carriers give you instant access to pre-negotiated rates — up to 88% below retail — with no contract negotiation.
Explore Wallet Carriers →Most tools compare published rates. Luma AI selects based on historical performance across 1B+ shipments.
Learn how Luma AI works →Run your shipment volume through the rate simulator for a side-by-side cost comparison — before you talk to anyone.
Try the Rate Simulator →EasyPost gives your operation 100+ carrier integrations, AI-powered rate selection, and peak-season reliability — through one API.
Trusted by 100,000+ shippers since 2012.