API Development
API Development That Connects Your Systems and Scales With You
We design and build secure, reliable APIs that let your software, partners, and third-party tools talk to each other seamlessly.
Whether you need a public API for your product, a private API for internal systems, or a bridge to a third-party service, OverDrive builds robust APIs with clean documentation, strong security, and the performance to handle real-world traffic.
APIs and integrations we can build for you
Examples of the integration and API work OverDrive uses to connect your systems.
Example concepts that illustrate the type of work we build. Every project is designed and developed from scratch for your business.
E-commerce Integration API
A middleware API that keeps your storefront, inventory, and shipping providers perfectly in sync so stock and orders never fall out of date.
Key features
- Real-time inventory sync
- Order routing to fulfillment
- Multi-channel product updates
- Webhook event handling
- Retry and error monitoring
8-12 weeks
$35,000-$55,000
Payment Processing API
A secure payments layer that handles charges, subscriptions, and payouts across multiple providers behind one clean, reliable interface.
Key features
- Unified multi-provider interface
- Subscriptions and recurring billing
- PCI-conscious architecture
- Automated reconciliation
- Detailed transaction logging
10-14 weeks
$45,000-$70,000
Ready to see what your project would cost?
Answer a few simple questions and our AI will build you a preliminary estimate in minutes, no technical knowledge required.
Why choose OverDrive for API development
A good API is invisible to your users and rock solid behind the scenes. That is exactly what we build.
Security built in
Authentication, authorisation, rate limiting, and encryption are part of every API we build, not an afterthought.
Fast and reliable
We design APIs that stay quick and stable under load, with caching and sensible architecture from day one.
Clean documentation
Every API ships with clear docs so your team or partners can start using it without hand-holding.
Designed for the long term
Versioning and thoughtful design mean your API can evolve without breaking the apps that depend on it.
Senior developers only
APIs are the plumbing of your business. Ours are built by experienced engineers, never outsourced.
You own it fully
You own 100% of the code, with no proprietary lock-in and full control over your infrastructure.
API services we deliver
From a single endpoint to a full API platform, we cover the whole spectrum of API work.
REST APIs
Clean, well-structured REST APIs that are easy to consume and built to industry standards.
Custom APIs
Bespoke APIs designed around your exact data, business rules, and use cases.
Third-party integrations
Connect your systems to payment, shipping, CRM, and any other service through their APIs.
API architecture
Scalable, well-planned API architecture that supports your product as it grows.
Secure APIs
Robust authentication, encryption, and access control to keep your data and users safe.
Payment APIs
Reliable integrations with payment providers for smooth, secure transactions.
API automation
Automate data flows between systems so information moves without manual work.
Industries we serve
We build APIs for products and businesses across many sectors, each with its own security and performance needs.
Our development process
A structured process that delivers APIs that are secure, documented, and ready for production.
Discovery
We learn what systems need to connect, the data involved, and how the API will be used.
API design
We design the endpoints, data contracts, and security model, then agree scope and timeline.
Prototype
We build core endpoints early so you can test the integration against something real.
Build
We develop the full API with testing, security reviews, and clear documentation throughout.
Launch
We deploy to production with monitoring, logging, and versioning in place.
Support
We maintain and extend the API as your product and integrations grow.
Technologies we use
We build APIs on proven, modern technology chosen for reliability and performance.
Backend
Data and caching
API standards
Cloud and infrastructure
The benefits to your business
Well-built APIs remove friction, unlock integrations, and let your business move faster.
Connect everything
Let your apps, partners, and tools share data automatically instead of through manual exports.
Automate data flow
Move information between systems in real time, removing slow and error-prone manual steps.
Enable new products
Open your data and features to partners or new apps and create fresh revenue opportunities.
Stay secure
Strong authentication and access control protect your data as it moves between systems.
Scale with demand
APIs built to handle growth keep performing as your traffic and integrations increase.
Easier maintenance
Clean design and documentation make future changes faster, cheaper, and less risky.
Example business use cases
A few examples of how custom APIs solve real business problems.
Connecting an online store to a warehouse
A custom API syncs orders, stock, and shipping between an e-commerce site and a fulfilment system in real time, ending manual re-entry and stock errors.
A public API for a SaaS product
A well-documented API lets customers and partners build on top of the product, opening new integrations and making the product far stickier.
Unifying data across internal tools
APIs tie together separate internal systems so data flows automatically, giving staff one accurate, up-to-date picture.
Secure payment processing
A payment API integration handles transactions smoothly and securely, with the compliance and reliability that money movement demands.
Get a real estimate in minutes, not weeks
Skip the back-and-forth. Our instant quote system gives you a detailed price, scope, and timeline right away. There are three easy ways to start.
Upload an existing quote
Already have a quote from another agency? Upload it and we will beat it whenever possible.
Describe your project
Tell us what you want to build in plain language. Our AI turns it into a detailed estimate.
Start with just a budget
No requirements yet? Enter your budget and we will show you what is realistically possible.
Frequently asked questions
Everything you need to know before you get started.
What is an API and why do I need one?
An API is a secure way for software systems to talk to each other. It lets you connect your tools, automate data flow, and integrate with third-party services instead of doing everything manually.
Can you integrate with a specific third-party service?
In almost all cases, yes. If a service offers an API, we can integrate with it. Tell us what you use and we will confirm during discovery.
How do you keep APIs secure?
We build in authentication, authorisation, encryption, and rate limiting on every API, and we follow security best practices throughout development.
How much does API development cost?
It varies with scope, but you can find out fast. Use our instant quote tool for a detailed estimate in minutes.
What if I already have a quote from another agency?
Upload it to our instant quote tool and we will do our best to beat it while being clear on scope and value.
Do you provide documentation?
Yes. Every API we build comes with clear documentation so your team or partners can use it confidently.
Ready to see what your project would cost?
Answer a few simple questions and our AI will build you a preliminary estimate in minutes, no technical knowledge required.