API Integration
Multi-Carrier Shipping API
Seamlessly integrate with 350+ carriers through OTO’s API. Automate shipments, track deliveries, and sync your entire logistics operation from one platform.
Start integrating in minutes.
Create your free demo account now.
Join industry leaders who trust OTO for smarter logistics
A Shipping API That Simplifies and Optimizes Your Logistics
Connect to All Carriers Instantly
Skip the hassle of multiple carrier APIs. Integrate with 350+ carriers through a single, powerful API.
Cut Costs, Save Development Time
Save money and resources by managing all your shipping operations in one place.
Handle High Volumes Easily
Optimize operations and ensure fast and reliable performance at scale.
Better Financial Oversight
Get clear insights into transactions and shipping costs for better budgeting and forecasting.
Unlock the Power of Unique API Features for Seamless Integration
Experience next-level automation with our API’s unique features—designed for flexibility, speed, and seamless integration. Enhance your workflow with cutting-edge capabilities that set your business apart.
Track Shipments Anywhere
Get real-time shipment status and history via API and webhook—no authorization needed. Track seller shipments across multiple platforms effortlessly.
Get Shipping Rates Instantly
Retrieve OTO’s competitive shipping rates via API, compare options, and choose the best price for every shipment.
Sync Sales Channels Effortlessly
Integrate your sales channel with OTO’s API. Connect one platform to manage orders, shipments, and logistics in real time.
Print Shipping Labels in Bulk
Generate and print multiple labels simultaneously to save time and speed up your shipping process.
ZPL-Optimized Labels
Create high-quality, printer-ready ZPL shipping labels for smoother logistics operations.
Detailed Shipping Reports
Access comprehensive shipping data, from cost estimates to invoice reconciliation, all in one place.
A Complete API Suite for Logistics Management
Manage shipments, track orders and automate logistics with one powerful API. Simplify operations and keep everything running smoothly.Enhance your workflow with cutting-edge capabilities that set your business apart.
Marketplace API
Register and manage vendors and sellers effortlessly.
Order Management API
Process, update, and sync orders seamlessly.
Shipping API
Generate labels, manage shipments, and simplify deliveries.
Shipping Rates API
Get accurate shipping rates from OTO or your own carrier contracts.
Shipping Transactions API
Access cost estimates, invoice reconciliation, and adjustments.
Returns API
Create returns, generate labels, and send return notifications.
Tracking API
Get real-time tracking updates and delivery statuses via API and webhooks.
Carrier Integrations API
Connect with 350+ carriers through one simple integration.
Address Validation API
Verify addresses before shipping to avoid failed deliveries.
Sales Channel API
Sync orders from various e-commerce platforms and marketplaces.
Pickup Locations API
Create and update pickup points with ease.
Products API
Sync, create, and update product details and inventory for smoother shipping.
How to Get Started
01 Signup
Register for a free API demo account through your OTO account.
02 Explore & Test
Review our API reference guide and sample requests and use our sandbox environment to validate your setup.
03 Deploy
Implement the API into your production environment and refine workflows as needed.
Ready to try it?
Explore Additional Resources
FAQs: Got Questions? We've Got Answers
Thanks to our developer-friendly documentation and sandbox testing environment, integration can be completed quickly.
Yes! OTO’s API supports seamless integration with various e-commerce platforms, marketplaces, and sales channels.
Yes! OTO’s API allows you to generate and print multiple shipping labels at once, including high-quality ZPL-optimized labels.
You can access detailed shipping reports, including cost estimates, invoice reconciliation, and shipping transaction data.
Our API provides live shipment tracking and historical data without requiring additional authorization, making it easy to monitor deliveries.
Yes, by registering a webhook, you will receive updates instantly without sending a request to the API
The Returns API allows you to create return shipments, generate labels, and send return notifications.
Yes, OTO’s platform is built for speed and reliability, ensuring smooth performance even when handling large shipment volumes.
Yes, OTO enables businesses to instantly compare shipping rates and choose the best option, ensuring cost-effective solutions.