Multi-carrier shipping API for smarter fulfillment

Create compliant labels across 200+ global carriers through one API integration. Connect to USPS®, UPS®, FedEx™, and more while automatically applying the correct service codes, package types, and ship dates for every order. Print in bulk from your own systems, return tracking numbers and label URLs instantly, and support one-off, batched, or fully automated workflows without switching tools.

Avoid costly adjustments by sending precise dimensions and weight with every shipment. ShipStation API accepts standardized measurement objects so carriers calculate true dimensional weight—reducing post-shipment corrections, preventing surprise charges, and keeping every package within service limits.

Keep handoffs smooth and predictable with built-in ship date controls and automated manifest generation. Align labels with actual carrier pickup dates, meet cutoff requirements, and generate physical or electronic manifests by carrier and warehouse. Drivers scan once instead of package by package, speeding up pickup while keeping operations compliant.

Adapt to every shipment without reworking your process. Use predefined carrier package codes for flat-rate services or store reusable custom packaging types with fixed dimensions. Consistent packaging data improves rate accuracy and eliminates repetitive manual entry.

Protect high-value shipments with integrated parcel insurance options. ShipStation API supports ParcelGuard™ for US-based accounts, XCover for UK-based accounts, and carrier-provided insurance where available. Choose providers at the shipment level, assign insured values per package—even in multi-package shipments—and manage claims through your selected partner or carrier.

Ship complex, multi-box orders in a single request. Define individual package weights, dimensions, and insured values while generating all labels together. Retrieve a master tracking number that represents the full shipment across supported carriers like UPS®, FedEx™, and DHL Express—keeping customers and teams aligned from dispatch to delivery.

Stay aligned with carriers through automated manifest generation by carrier, warehouse, and ship date. Support both electronic and downloadable PDF workflows depending on requirements. Meet cutoff rules, maintain clean daily shipment records, and prevent compliance errors before they disrupt fulfillment.

Expand globally with built-in customs and compliance support. Include product-level descriptions, quantities, declared values, harmonized tariff codes, and required tax identifiers directly in your label request. Specify customs contents, set non-delivery preferences, submit VAT, EORI, IOSS, or EIN identifiers, and download forms when required—or rely on electronic submission where supported.

Deliver a smoother cross-border experience with Delivered Duty Paid (DDP) for qualifying USPS® shipments from the US to Canada. Enable sender prepay to cover duties and taxes upfront, providing clear landed costs before delivery. A flat DDP fee is included in the rate response—reducing friction and eliminating surprises at the door.

Shipping regulations don’t stand still—and neither does ShipStation API. From updated HS code requirements to frameworks like Windsor for Great Britain to Northern Ireland shipments, the API continuously evolves to support new compliance fields and workflows. Add movement indicators, “not at risk” flags, updated tax identifiers, and expanded customs data without rebuilding your integration.