White Label API Development Partners
White label API development delivered under your agency's name, covering REST and GraphQL services for internal tools and public-facing platforms. Each API is secure, scalable and built by our developers, then handed over for you to present as your own.
Some of our direct clients
Why Agencies Build APIs With Us
Senior developers working invisibly under your brand, delivering secure, documented REST and GraphQL APIs your client believes your own team built.
On-time Delivery
We stick to schedules and keep you informed every step of the way. Your clients see a reliable team with consistent delivery.
Invisible Partnership
We operate behind the scenes so your brand stays front and centre. All communication and output reflect your agency, not ours.
Built for Agencies
Our team has spent years delivering white label solutions for creative, digital, and technical agencies across many industries.
API-First Thinking
Whether REST or GraphQL, internal or public-facing, we design APIs that power modern platforms with clean, consistent structures.
Tight QA Standards
Every API is tested for performance, security, and reliability across expected use cases before it leaves our hands.
Developer-Led
Projects are led by technical managers who understand real-world engineering needs. You’ll never need to explain the same thing twice.
The APIs We Deliver Under Your Brand
Public REST and GraphQL services, internal APIs and integration layers, built white label with authentication, rate limiting and full documentation, then handed over for you to present as your own.
Laravel & Bespoke Platforms
For systems and platforms that require bespoke processes, data handling complex integrations or internal business platforms with security at the forefront of the build.
WordPress & WooCommerce
For fast, reliable and easy to manage brochure based websites built following best practice with a bespoke theme powered by ACF Pro and supporting custom built plugins.
Shopify & Shopify Plus
For eCommerce and retail brands looking to grow revenue significantly online. Built using a bespoke theme specific to your brand and with a full seamless migration from legacy platforms.
Recent Direct Client Projects
QualityHive
A Laravel platform that web agencies use to capture, assign and close website bugs, taken from wireframe to launch, then handed over as clean, documented code.
SaaS platform · Laravel · API integrations
Clintons Cards
A full migration from Magento 2 to Shopify Plus, with order, customer, product, stock and finance integrations kept live through the switch.
Ecommerce · Shopify Plus · Integrations
The Sauce Foundry
A brand, a WooCommerce store and product photography for an artisan hot sauce startup, launched to a 3.8% conversion rate from day one.
Ecommerce · Branding · WooCommerce
A Website QA Platform Built To Scale
QualityHive came to us with an idea and a waiting list. We built them a Laravel platform that web design and development agencies now use to capture bugs straight from a client's website, assign them to developers and close them off, and handed it over as clean, documented code.
The Brief
Agencies were collecting website feedback the hard way: long email threads, shared spreadsheets and screenshots pasted into documents. Nothing was assignable, nothing was searchable, and the same bug was often reported three times by three different people.
QualityHive needed a platform an agency could roll out to a client in minutes, with a browser extension that captures a bug straight from the page, complete with a screenshot, the exact URL and the browser and screen it happened on, and an API their clients' project tools could talk to.
What We Built
One platform, three jobs: capture a bug on the page, triage it with the team, prove it fixed to the client.
Point-And-Click Capture
A browser extension pins a bug straight onto the client's site, grabbing a screenshot, the exact URL and the browser, OS and screen size, so nobody has to describe where it happened.
Assignment And Triage
Every bug routes to a developer with a status, a due date and a full comment thread. Duplicates are caught as they are raised, on a board the whole team shares.
Client-Ready Reporting
Open bugs, resolution rates and project progress export as clean, branded reports, which is what QualityHive's own agency customers renew on.
Roles And Permissions
Agency, developer and client each see their own view of a project, with per-project access managed by the account owner.
Billing And Trials
Per-seat subscriptions, trial expiry and proration wired through Stripe, so the team can price without touching code.
A Documented API
A REST API with webhooks and written docs, so their customers' project tools can pull bug data without our involvement.
How We Ran It
Four stages, weekly demos, and direct access to the developer writing the code. No account managers in between.
Two workshops with real agency feedback in hand, then a written spec and a fixed quote.
Every screen agreed in grayscale before a line of Laravel, so changes cost minutes rather than sprints.
Fortnightly releases to a staging site the team could hand to pilot customers and comment on directly.
Repository, environment notes and API docs transferred, with a retained day a month for support.
The Result
QualityHive launched to their pilot agencies in week 14 and replaced the email-and-spreadsheet routine entirely. Feedback that used to take an evening to chase down is now captured in a click from the page it happened on, and the API means larger customers can pull bug data into their own reporting without asking anyone.
We still support the platform on a retained day a month, and the code sits in their repository, not ours.
We built QualityHive because website QA was still being run through email threads and spreadsheets. Now an agency captures a bug in a click straight from the page, assigns it and closes it off, all in one place. It has become the tool teams open first thing in the morning, which is exactly what we set out to build.
Head of Product, QualityHive
From Magento To Shopify Plus
We had supported Clintons Cards on Magento 2 for years. When the platform started to hold the business back, we migrated the whole storefront to Shopify Plus, kept every integration running through the switch, and lifted both conversion and revenue in the process.
The Brief
Clintons Cards had been running on Magento 2 for years, a platform we knew inside out from supporting it day to day. It had become slow to change, expensive to host and awkward to extend, and every peak trading period turned into a stress test the business would rather not sit.
They wanted to move to Shopify Plus without losing a single order, customer record or product, and without breaking the integrations their operation depends on, including the stock and finance link into their internal financing platform.
What We Built
A clean Shopify Plus storefront, and the integration layer that kept the business running through the switch and after it.
Magento to Shopify Plus Migration
Every product, customer and historic order moved across to Shopify Plus, mapped and reconciled, so nothing was lost and customers noticed only a faster, cleaner store.
Order and Customer Sync
Orders and customer records flow between Shopify and the back office in real time, so the operation runs on one source of truth rather than nightly exports.
Product and Catalogue Integration
Product data, variants and pricing stay in step across systems, so the catalogue is managed once and is right everywhere it appears.
Stock and Finance Integration
A live link into their internal financing platform keeps stock levels and financials aligned, so what the store sells and what the business reports never drift apart.
A Resilient Peak
Shopify Plus takes the hosting and scaling worry off the table, so Christmas and Valentine's peaks are handled by the platform rather than a late night on call.
A Clean Handover
The store, the theme and the integration layer were documented and handed over, with us on hand through the first peak and beyond.
How We Ran It
A migration with no big-bang risk: mapped, staged, tested against real data, then switched over in a controlled cutover.
We mapped every Magento entity, integration and custom flow, using what we already knew from supporting the platform.
The Shopify Plus store and the integration layer were built and wired to a staging environment running real, anonymised data.
Products, customers and order history were moved and reconciled, with counts checked on both sides before anyone signed off.
A controlled switch with the integrations live from minute one, and us watching the first orders land.
The Result
Clintons Cards moved off Magento onto Shopify Plus with no lost data and no gap in trading. Conversion rate rose by over three percent and revenue was up fourteen percent, on a store that is faster to shop and far easier for the team to run.
The integrations that keep stock, finance, orders and customers in step came through the migration intact, and we still support the platform as the business grows.
Migrating a retailer the size of Clintons Cards is where these projects usually come unstuck. The volume of orders, customers and SKUs leaves nowhere to hide, but we moved the lot to Shopify Plus with the integrations live throughout, not a record out of place, and the store came out faster and trading better than it went in.
Development Director, Zestcode
A Hot Sauce Brand Launched To Sell
The Sauce Foundry came to us as a startup with a great product and not much else. We built the brand, designed and built the store, sorted the product photography, and launched them to a 3.8% conversion rate from day one.
The Brief
The Sauce Foundry is an artisan hot sauce maker that arrived as a startup: a strong product, a founder with a vision, and no brand or store to sell it through. They needed the lot building from scratch, and they needed it to convert from launch, not eventually.
That meant more than a website. It meant an identity that looked established on day one, product photography good enough to sell a flavour through a screen, and a store built around the buy rather than bolted on after.
What We Built
A brand, a store and the photography to sell it, delivered together so nothing looked stitched from separate suppliers.
A Brand From Scratch
We shaped The Sauce Foundry's identity from the name outward, the logo, palette and voice, so a new maker turned up to market looking like it had been there for years.
A Store Built To Convert
A clean, fast storefront designed around the product and the buy, which is why it launched at a 3.8% conversion rate rather than slowly growing into one.
Product Photography, Sorted
Great sauce needs great photography, so we put them in touch with a photographer we trust and art directed the shots the store was built around.
Ready For Launch Day
Payments, shipping and stock were set up and tested so the very first order could land the moment the doors opened, not a week later.
Fast And Cached
Hosting tuned with server-level caching, so a small team is not paying enterprise bills and the store stays quick even when a new sauce takes off.
Room To Grow
Built on WooCommerce, so The Sauce Foundry owns the store outright and can add products, wholesale and subscriptions as the range expands.
How We Ran It
Brand first, then a store built around it, then a launch that was ready to sell from the first click.
We got to know the range, the maker and the customer, then agreed the brand direction and the shape of the store.
Identity, packaging cues and tone of voice, so the look was locked before a single page was designed.
The WooCommerce store designed and built around the products, with the photography we art directed dropped straight in.
Payments, shipping and analytics tested, then a clean launch, live and selling from day one.
The Result
The Sauce Foundry launched to a 3.8% conversion rate from day one, a figure plenty of established stores work years to reach. A brand new maker arrived at market looking the part, with a store that sold from the first visit.
We handled the brand, the build and the product photography together, and left them with a WooCommerce store they own outright and can grow into as the range and the business expand.
We came to Zestcode with a product and little else, and they handed us back a brand and a website we are genuinely pleased with. It looked the part from launch and, more to the point, it sold from launch.
The Sauce Foundry
Here's What Our
Clients Say
Consistently rated 5* on Google by our full build clients and retainer clients.
Frequently Asked Questions
White Label API Development for Agencies and Their Clients
When an agency brings an API project to us, the questions are usually practical: what should the API actually do, will it hold up under real traffic, and can it be delivered under your brand without your client ever seeing us. Here is how we build APIs that answer all three.
What white label API development means for your agency
White label API development means we build the API and you own the relationship. Every proposal, update and piece of documentation carries your branding, and your client only ever deals with your team. We are the engineering capacity behind the scenes, not a name on the invoice.
In practice this lets you take on work that needs proper backend engineering without hiring for it or turning it away. You win the project, set the client's expectations and stay the single point of contact, while we handle the design, build and testing to the standard you would expect from your own developers.
It sits naturally alongside our wider white label web development work, so an API can be one piece of a larger build or a standalone service, whichever the job calls for.
The kinds of APIs we build
Most projects fall into a few shapes. Public-facing REST or GraphQL APIs that let third parties or a client's own front end pull and push data. Internal APIs that connect services within a platform. And integration layers that sit between a bespoke system and the outside tools it needs to talk to.
We choose REST or GraphQL on the merits of the project, not habit. REST is often the right call for straightforward, well-scoped resources, while GraphQL earns its place when clients need to request exactly the data they want across a complex model. If a project is really about joining existing systems together, our API integrations work is usually the better starting point.
We also build the APIs that power larger products, so this pairs closely with portal and platform development and white label SaaS development when the API is the backbone of an application rather than a bolt-on.
How we stay invisible behind your brand
The whole point of a white label service is that your client never sees a third party. We work under your agency's name from the first document onwards, and we are happy to communicate through your project tools, use your templates, and keep our own branding entirely out of the deliverables.
On the technical side that means clean, self-explanatory code and documentation that reads as yours, so if your team or a future developer picks it up, nothing points back to us. If you ever want us on a client call in a supporting role we can do that too, but the default is that we stay out of sight.
You brief us once and get output you can pass on as your own, without having to filter or rewrite it first.
Not sure what your client's API actually needs to do?
Describe the platform, the data involved and who will be calling it. We will tell you honestly what the API should cover and roughly what it would take to build.
Security, authentication and rate limiting
An API is a door into a system, so how it is secured matters as much as what it does. We handle authentication properly, usually with API keys, OAuth or token-based access depending on who is consuming the endpoint, and we scope permissions so each caller can only reach what it genuinely needs.
We build in rate limiting and sensible throttling from the start, so a single client or a misbehaving script cannot degrade the service for everyone else. Input is validated, errors return useful but not leaky responses, and anything sensitive is encrypted in transit.
Where an API handles personal or payment data we design with the relevant obligations in mind rather than adding them later, and we keep enough logging that you can see what was called, by whom and when.
Documentation, versioning and handover
A well-built API is only as useful as the documentation that comes with it. Every project ships with clear reference material covering endpoints, parameters, authentication and example requests, written so a developer consuming the API can get going without a call.
We version APIs sensibly so that future changes do not break the integrations already relying on them. When an endpoint needs to change, existing consumers keep working while the new version rolls out, which matters a great deal once real clients are depending on it.
Handover is deliberate, not a code dump. You get the documentation, a clear explanation of what was built and how, and a codebase your own team can maintain if they ever need to.
Performance, scaling and what it costs
APIs tend to start small and then get busy, so we build with that in mind. Efficient queries, caching where it helps, and pagination on anything that returns a list, so response times stay steady as usage grows rather than degrading the day the API becomes popular.
Cost depends on the shape of the work. A focused API over a defined data set is a smaller job than a full platform backend with complex business logic, so rather than a fixed rate card we scope each project and quote it properly. Where the API is powered by a Laravel backend, our white label Laravel development work often runs alongside it.
You get a fixed-price proposal with a clear scope before anything starts, so the number you quote your client is one you can stand behind.
Partner with Zestcode for Industry Leading Quality and Reliability
Tell what you're looking for and we'll see you how we can help. Quotes are typically provided within 2 working days of the initial call.