April 23, 2025
Ideation
We begin with brainstorming ideas based on your business goals. Our team explores use cases, target users, and possible features to shape a clear API vision before starting the actual technical work.
01/06
API Development Services
Fuel your business growth through custom API development. Achieve seamless integration and drive growth. Our custom API solutions support a range of integration protocols, including REST, SOAP, XML, and RPC API. Seamless integration of your systems is achieved through custom APIs built by our expert API developers using these protocols.
Why businesses should invest in API development
$5.42B Market Size in 2024
$32.77B Market Size by 2023
25.0% CAGR from 2025 to 2032
Seamless Connectivity
Scalable Growth
As your business grows, APIs make it easier to expand your systems without rebuilding from scratch. Whether adding new services, tools, or users—APIs keep everything running smoothly as you scale.
Future-Ready
APIs prepare your business for digital transformation. From mobile apps to cloud platforms, they’re the backbone of modern tech—keeping you flexible, competitive, and ready for whatever’s next in your industry.
API Development Services we offer
We offer end-to-end API development services to help your business connect, scale, and thrive in the digital world. From custom builds to secure integrations—we’ve got your APIs covered.
Custom API Development
- We build APIs tailored to your business needs, ensuring smooth communication between software systems. Our custom APIs are scalable, fast, and designed for long-term flexibility and performance.
- Built from scratch to match your workflows
- Lightweight and fast-performing
- Easy to scale as you grow
- Supports both REST and GraphQL
- Clean, well-structured codebase
Third-Party API Integration
- By seamlessly connecting your app with third-party platforms like payment gateways, CRMs, or social logins, we help you expand functionality without reinventing the wheel.
- Fast and secure integration process
- Real-time data sync across platforms
- Compatibility with major APIs (Stripe, Salesforce, etc.)
- Minimal downtime during setup
- Thorough testing to ensure reliability
API Architecture & Design
- Our smartly designed, future-ready API architectures are easy to understand, well-documented, and developer-friendly—built to handle growth and complex logic.
- RESTful or GraphQL architecture
- Clean, modular design
- Follows API design best practices
- High performance under load
- Designed for easy collaboration
API Security Implementation
- We implement strong security practices to protect your APIs from unauthorized access, data leaks, and attacks. This helps in keeping your systems and users safe.
- OAuth 2.0 and API key protection
- Rate limiting and throttling
- IP whitelisting and blacklisting
- End-to-end encryption
- Regular vulnerability assessments
API Documentation & Testing
- At The NineHertz, we create clear, developer-friendly API documentation and perform in-depth testing so your team can integrate and troubleshoot with ease.
- Swagger/OpenAPI-based docs
- Real-time testing environments
- Code examples and error-handling guides
- Easy onboarding for dev teams
- Automated and manual test coverage
API Management & Monitoring
- We offer tools and dashboards to monitor your API performance, usage, and health. This ensures stability and gives you full control over your API lifecycle.
- Real-time analytics and logging
- Traffic and usage reports
- Version control and lifecycle management
- Alerts for downtime or errors
- Scalable with cloud platforms
Top API Development Company
APIs help your systems work smarter together behind the scenes. They cut down on manual tasks through automation and save your team serious time. As your business grows, APIs make it easier to scale without needing a full rebuild. They also open the door to connect with third-party tools and apps, giving your setup more flexibility and room to evolve. It’s a smart investment that keeps your tech future ready and your operations running smoothly.
Postman
Postman is a widely-used API platform that enables developers to design, test, and document APIs efficiently, fostering collaboration and streamlining the development process.
Apigee by Google
Apigee, a Google Cloud product, provides a comprehensive suite for API management, including design, security, analytics, and monetization, catering to enterprise-level requirements.
MuleSoft Anypoint Platform
MuleSoft’s Anypoint Platform offers an integrated solution for API design, deployment, and management, facilitating seamless connectivity across applications, data, and devices.
Start Your Journey To Success
Develop A Robust Software
Our Milestones & Honors
We keep raising the bar with fresh ideas and solid work. As a trusted API development company, the recognition and awards we’ve picked up along the way are just proof that we’re doing things right.
1,300+
projects
delivered
100+
industry
sectors
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Achievement in Customer Satisfaction 2023
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America’s Fastest-growing Companies 2023
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Top 100 Global Outsourcing Providers and Advisors 2023
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Best IT Service Provider of the Year 2023
Ready to Hire the Best API Developers?
Our Custom API Solutions
Nothing beats our expert API development with AI-Powered solutions for seamless integrations. At The NineHertz, we are committed to empowering business enterprises with high-end API development and management solutions, driving connectivity, efficiency, and innovation.
Custom API Development
Need an API that works your way? We build them from scratch. Perfect for your apps, tools, or systems. No generic solutions—just what you need. No compromises, just exactly what you need at the best prices.
API Integration Services
Tired of juggling multiple apps that don’t talk to each other? We connect your apps with popular platforms like CRMs, payment systems, and third-party tools. Our integrations save time, reduce manual work, and let your software talk to each other smoothly.
Microservices & Serverless API Solutions
Say goodbye to clunky, hard-to-maintain systems. We build APIs using microservices and serverless tech, so your business stays agile, scales effortlessly, and only pays for what you use—no bloated infrastructure, just smart solutions.
Mobile & Web App API Development
Our APIs are designed to power mobile and web apps with real-time data, fast performance, and smooth user experiences. Whether it’s iOS, Android, or web—we’ve got it covered.
API Gateway & Management
Managing multiple APIs can feel like herding cats. We set up smart API gateways that act like a control hub—securing, monitoring, and routing all your data traffic in one place. Less chaos, more clarity.
Secure API Development
APIs are gateways to your data, and we guard them fiercely. From encryption to strict authentication, we bake in top-tier security so hackers meet a locked door—not your sensitive info.
Real-Time API Solutions
Need live data updates? We create real-time APIs for things like chat apps, tracking systems, or dashboards—so your users always get the latest info without refreshing or waiting.
API Modernization & Optimization
Legacy APIs slowing you down? We revamp, optimize, and modernize them—turbocharging performance, cleaning up messy code, and making sure they’re built to last (and easy to maintain).
What makes us the best API Development Company?
We have a 100% client retention rate and that is a good enough reason for you join hands with us as your trusted API app development partner. Our API developers are well-versed in crafting high-end, future-ready solutions.
Zero-Cost Evaluation
We offer a zero-cost evaluation to help you understand your project scope. As a trusted API development company, we ensure clarity before you commit—no hidden charges, no surprises.
Timely Outcomes
Our API developers follow agile workflows to deliver projects on time, every time. Unlike many API development companies, we stick to deadlines without compromising on quality or performance.
Competitive Prices
We provide custom API development services at competitive prices. Whether you’re a startup or an enterprise, our pricing model is fair, transparent, and built to fit your budget.
Agile Methodology
As a modern API development company, we use agile methodology that helps us stay flexible, make improvements fast, and keep your goals front and center. Your APIs stay efficient, up-to-date, and ready for whatever comes next.
Dedicated Team
Our team of expert API developers is fully dedicated to your project. We bring the right mix of know-how and care to get the job done right. We are the masters of API development.
Premium Quality
We deliver custom API development services with a focus on premium quality. Every API we build is secure, scalable, and performance-optimized—built to meet high industry standards.
24×7 Support
Our job doesn’t end at delivery. As one of the most responsive API development companies, we provide round-the-clock support to keep your APIs running smoothly—anytime you need us.
Helping Enterprises with Cutting-edge API Development
ISO 9001 CERTIFIED NASSCOM & STPI ACCREDITATION
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800+
Projects Launched
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15+
Years of Experience
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575+
Dedicated Developers
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92%
Client Retention
Showcasing Our Projects in
Innovative marketplaces have highlighted our dedication to adopting and implementing new technologies.
Our API Development Process
Our API development process is clear, collaborative, and built for success. From idea to launch and beyond, we follow a step-by-step approach to deliver reliable, high-performance APIs.
Our Engagement Models
Hire expert API developers with flexible hiring models. Choose from tailored hiring options to match your project needs and foster productivity and cost-effectiveness.
Dedicated Team
Build a dedicated, highly skilled team solely for your project, fostering seamless collaboration and concentrated development to meet long-term objectives.
Fixed Price Model
Great for projects with clear goals, this approach guarantees on-time and on-budget delivery, so you know exactly what to expect cost-wise.
Hourly Basis
Get to pay on hourly basis with our hourly basis model, ideal for flexible projects where our expert developers will meet your specific requirements.
Hybrid Model
The hybrid hiring approach integrates both in-house and remote teams, providing adaptability, cost-effectiveness, and the opportunity to tap into a diverse global talent pool.
Project Outsourcing
Outsource your project when you are unsure of managing it yourself and want expert monitoring.
Power Your API Development with Innovation
API Development Services Case Studies
Here’s how our API solutions have helped real businesses solve real problems. From faster checkouts to smarter integrations, our work speaks for itself.
Seamless Payment Integration for an E-commerce App
We helped an online fashion store integrate Stripe and PayPal APIs, allowing them to accept payments globally. The new setup boosted their checkout speed and reduced cart abandonment significantly.
Country 
USA
USA Platforms iOS, Android, Web
- Integrated multiple payment gateways
- Real-time transaction tracking
- PCI-compliant and secure
- Smooth refund and dispute handling
- Zero downtime during integration
Scalable API for a Health & Fitness Platform
A fitness startup needed an API to connect mobile apps, smartwatches, and health trackers. We built a robust, scalable API to sync real-time user data and support thousands of daily requests.
Country UK
UK Platforms iOS, Android
- Built on REST with real-time sync
- Scaled to handle high-traffic
- Lightweight and fast response times
- Easy integration with wearables
- Designed for future feature expansion
Custom CRM API for a Real Estate Agency
We developed a custom API to connect the agency’s website with its internal CRM. This allowed agents to manage property listings, client data, and appointments directly from one platform.
Country 
Canada
Canada Platforms Web, iOS, Android
- Tailored API matching business flow
- Secure client data access
- Instant property updates on the website
- Role-based access for agents
- Integrated with calendar and email tools
Tech Stack We Use
We use a powerful and modern tech stack to build secure, high-performing APIs tailored to your needs. Our tools and technologies ensure reliability, scalability, and seamless integration across platforms.
AngularJS
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ReactJS
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Vue.js
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JavaScript
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CSS3
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HTML5
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TezJS
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Meteor
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Ember
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Nextjs
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Node.js
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PHP
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Java
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Python
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.NET
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GO
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C++
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iOS
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Android
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Flutter
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React Native
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Xamarin
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Ionic
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Cordova
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PWA
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Dynamics 365
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Salesforce
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Adobe Commerce
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Share Point
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Servicenow
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Power BI
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Sap
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Zoho
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Tableau
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MS Dynamics CRM
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MySQL
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PostgreSQL
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SQL Server
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MongoDB
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Oracle
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Apache HBase
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Apache-nifi
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Cassandra
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HIVE
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DynamoDB
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Google Cloud
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Azure
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DigitalOcean
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Rackspace
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Azure Blob Storage
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Azure cosmos DB
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Azure Data Lake
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Azure SQL Database
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Azure Synapse Analytics
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Google Cloud Datastore
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Google Cloud SQL
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Kubernetes
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Docker
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Jenkins
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Apache Mesos
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Openshift
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Terraform
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Packer
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Saltstack
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Azure Devops
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CI CD
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Google Developer Tools
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Teamcity
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Data Dog
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Grafana
Models & APIs
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OpenAI
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Meta
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Mistral AI
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Google
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Hugging Face
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Grok
Vector Databases
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MongoDB Atlas
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Chroma
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Mistral AI
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Google
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Meta
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Drant
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Pinecone
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Milvus
LLM Frameworks
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LangChain
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LlamaIndex
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Haystack by deepset
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Microsoft-AutoGen
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Nvidia NEMO
Deployment
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Vertex.ai
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Kubernetes
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Hugging Face
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Docker
Programming Languages
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Matlab
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Octave
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R Programming
Frameworks
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Apache Mahout
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Caffe
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Mxnet
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Transflow
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Keras
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Torch
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Open CV
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Theano
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Traditional 3-layer Architecture
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Cloud-native Architecture
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Microservices-based Architecture
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Service-oriented Architecture (SOA)
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Reactive architecture
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Computer vi
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Various Approaches to Enterprise Application Integration
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PWA
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Selenium
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Appium
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Protractor
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FMBT
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XCTest
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TestStack White
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CUIT
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Ranorex
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Postman
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Apache JMeter
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QuickTest Pro
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Unified Functional Testing
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Cloudflare
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Siege
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Burp Suite
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Nessus
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Aircrack-ng
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Rapid7 Metasploit
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Acunetix
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Nmap
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DIRB
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Wireshark
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Zmap
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Masscan
Custom API Development Services Across Industries
As an award-winning API development company, we cater to multiple industries. Our expert team is well aware of the evolving needs of businesses to craft a solution that stands out.
E-Commerce and Retail
We build APIs that connect online stores, payment systems, and inventory tools. Our solutions help retailers improve customer experience, manage orders faster, and streamline operations across platforms—web, mobile, or in-store.
- Payment gateway integration
- Inventory and order sync
- Customer management
- Real-time tracking
- Multi-platform support
Manufacturing
Our APIs connect machines, systems, and software to automate workflows in manufacturing. From supply chain data to production tracking, we help boost efficiency and reduce downtime with reliable and scalable APIs.
- ERP system integration
- Production line monitoring
- Real-time data sharing
- Supplier coordination
- Secure internal APIs
Healthcare
We develop secure APIs for patient data, appointment systems, and health platforms. Our solutions meet privacy standards while helping healthcare providers deliver faster, safer, and more connected care experiences.
- HIPAA-compliant solutions
- EHR/EMR integration
- Appointment & billing APIs
- Patient portal connectivity
- Strong data encryption
Automotive
Our APIs support vehicle tracking, diagnostics, booking systems, and connected car platforms. Whether for service providers or manufacturers, we deliver smooth integrations that drive smarter mobility and better user experiences.
- Telematics integration
- Fleet management APIs
- IoT and diagnostics support
- Booking and service platforms
- Real-time vehicle data
Food
We create APIs for food delivery apps, kitchen management, and online ordering. From restaurant menus to delivery tracking, our APIs make food businesses more connected, automated, and customer-friendly.
- POS and kitchen sync
- Order and delivery tracking
- Menu management APIs
- Third-party app integration
- Customer feedback systems
What Client Says
During our API development services, we have achieved a significant client retention and satisfaction rate.
We have been working with The NineHertz for our MVP Launch project for more than 3 years. The Project was delivered in less than a year and completed all the discussed competencies and features. Our application received marked thousands of downloads within a few months post-deployment. The experience with The NineHertz has really been fantastic. Their communication and response allowed me to have keen control over my project and foster perfection in every development phase. Thanks to their professionalism and quality service, we are now engaged as a long-term digital support partner for our MVP and the organization’s online presence platforms.
Christopher Graham
Co-Founder / CEO – Chilling Inc.
I worked with The NineHertz for my development project with little or no software development experience. Their expertise and excellence in UI designing and core development have really brought my idea to life. The communication was so great that I never felt something going out of track. The project was delivered at the very time. The development team, sales team, and testing team have been well-responsive to providing project and deliverable updates frequently. Looking forward to working with them on version 2.0.
Roosevelt Bowman
CEO of Career Accelerator
The dedication that The NineHertz team exhibited during the project is really remarkable. The graphic designer at the company was really able to bring my thinking to life with their creative designs. Having deployed my application, I still receive appreciation from my users for the seamless, and informative user interface. The team does share a lot of suggestions that helped me make better decisions. All the deliverables were achieved on time. I will really suggest The NineHertz to anyone looking for a digital software development partner.
Jade Punski
Co-founder/CEO – Dog Park
Frequently Asked Questions
Here are some questions you might have. If you have other questions, feel free to contact or have a consultation session-
We develop all four types of APIs that businesses use. Starting with REST APIs that are fast lightweight, and widely used for web and mobile apps. Then we have SOAP APIs that are secure, structured, and suitable for enterprise applications. We also cover GraphQL APIs that come with utmost flexibility, allowing users to fetch only the data that is required. And last but not the least, businesses reach to us to develop their custom APIs tailored to their specific business needs.
Yes, we do offer API integration services so that businesses can connect their multiple software platforms, enabling seamless data transfer between applications like CRM, ERP, payment gateways, and cloud services.
There are uncountable benefits that come along with API development including the following:
- Interoperability
- Enhanced revenue
- Scalability and flexibility
- Cost control and sustainability
- More Productivity
The average time an API usually takes to build is roughly between 60 to 70 hours or more. Having said that, an API app can also be built in less than 40 hours, or in as many 100 hours. The timeline depends totally on the level of complexity of the API. More complexity means more time invested and vice versa.
The custom API development cost can vary widely based on multiple factors including the level of API complexity, the number of endpoints, the level of security required, and the development team’s location. However the average cost to build a custom API can range from $5000 to $25,000, but it can be higher for more complex projects.
Yes, The NineHertz has an experienced team that is capable enough to produce APIs for both mobile and web platforms.
Yes, in order to make sure there is sustainability and long-lasting API performance, we provide time to time maintenance and support services for APIs.
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