EasyPost API
Multi-carrier shipping API that normalizes label creation, rate shopping, address verification, and tracking across 100+ carriers (UPS, USPS, FedEx, DHL, etc.) through a single unified interface.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Test and production API keys. Webhook HMAC validation. SOC2 Type II. Carrier credentials managed by EasyPost — not exposed in API. Simple but effective security model.
⚡ Reliability
Best When
An agent needs to automate shipping label creation across multiple carriers, compare rates, and track packages through a single unified API.
Avoid When
You only use one carrier and have a direct integration, or need very specialized freight/logistics features.
Use Cases
- • Buying shipping labels across multiple carriers from a single agent workflow
- • Rate shopping to find cheapest or fastest carrier for a shipment
- • Address verification before creating shipments
- • Shipment tracking across all carriers with unified status events
- • Batch label creation for order fulfillment automation
Not For
- • Last-mile delivery optimization (routing, dispatch)
- • Freight/LTL shipping at enterprise scale
- • Non-shipping logistics operations
- • Carriers outside EasyPost's network (regional/local couriers)
Interface
Authentication
API key passed as HTTP Basic Auth username with empty password. Test and production keys are separate. No OAuth flow needed — simple key-based auth ideal for server-side agents.
Pricing
Postage costs are pass-through from carriers plus a small EasyPost markup. No monthly fees for basic use. Volume discounts available. Test environment is completely free.
Agent Metadata
Known Gotchas
- ⚠ Rate shopping requires creating a Shipment object first (free), then buying the selected rate
- ⚠ Test mode uses simulated carriers — real carrier errors only appear in production
- ⚠ Address verification is recommended but not mandatory — unverified addresses can cause delivery failures
- ⚠ Shipment objects expire after 120 hours if not purchased — agents must complete purchase promptly
- ⚠ Some carrier accounts require separate setup in EasyPost dashboard before agents can use them
- ⚠ Tracking webhooks can arrive out of order — agents must handle event ordering gracefully
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for EasyPost API.
Scores are editorial opinions as of 2026-03-06.