Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

SlashHash LLC
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**Prioritizing the Rescue of Underperforming Software:** Our expertise lies in salvaging struggling v1 software and evolving it into strong, scalable v2 solutions that drive your growth. We’re more than just a typical software development firm; we are a team of experienced professionals committed to
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Denville Township, New Jersey, Us
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“SlashHash LLC specializes in transforming underperforming software into scalable, production-ready solutions, leveraging expert Python backend development to empower startup growth efficiently and reliably.”
Your Software Partners
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We are a software development company with a clear mission: to transform technical challenges into a competitive edge. Our approach goes beyond mere coding; we immerse ourselves in your business to identify the obstacles hindering your progress. By merging our enthusiasm for personal connections wit
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Hatfield, England, Gb
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“Your Software Partners delivers agile, remote software development, transforming technical challenges into efficient digital solutions that enhance business operations and drive competitive advantage.”
mindcherry
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Driven by a passion for scalable web applications, our team specializes in creating innovative solutions. We support early and mid-sized startups by developing and refining their MVPs, providing consistent support from the beginning. Our team works in close partnership with yours to expedite the tim
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“Mindcherry specializes in developing and refining scalable web applications for early and mid-sized startups, partnering closely to accelerate MVP delivery and market launch.”
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Neokord
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Empowering the Future Today: Effortless Solutions from Code to Cloud. Our Full-Stack IT Company goes beyond limits, creating outstanding digital solutions at every level. Enhance your business with our extensive knowledge in software development, infrastructure management, and more. Your success is
Highlights
10-49
Employees
Services Provided
35% API Development & Integration
50% Custom Web Application Development
15% E-Commerce Development
AI Summary
“Neokord is a full-stack IT company delivering comprehensive digital solutions from software development to infrastructure management, prioritizing innovation and business success across industries.”
Chamomile.ai
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For AI chatbots to be effective, they must be dependable. In a professional environment, merely providing a human-like reply is inadequate if you have to verify the accuracy of every detail in the response. Businesses require AI chatbots that can be relied upon. Reliable Retrieval Augmented Generati
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
10% Generative AI
20% Custom AI Chatbot Development
4% AI Strategy & Roadmap Consulting
33% API Development & Integration
AI Summary
“Chamomile.ai specializes in reliable AI chatbot solutions using advanced Retrieval Augmented Generation, combining expertise in data science and cybersecurity to deliver trustworthy, business-focused AI results.”
currencylayer
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Currencylayer, developed by apilayer, is a SaaS API tool that can be integrated into websites to deliver real-time exchange rates and currency conversion services for businesses. It also offers access to historical exchange rate data.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
75% SaaS Product Development
25% API Development & Integration
AI Summary
“Currencylayer, by apilayer, provides a SaaS API delivering real-time and historical currency exchange rates and conversion services, enabling seamless financial integrations for businesses.”
AW Technology dev
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Nuestra compañía se dedica a ofrecer soluciones de automatización personalizadas para organizaciones que desean mejorar sus operaciones mediante la implementación de software adaptado. Generamos eficiencia al reducir errores, asegurando la organización en todos los procesos y liberando tiempo valios
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
20% Mobile App Development (iOS & Android)
35% API Development & Integration
10% E-Commerce Development
AI Summary
“AW Technology dev. specializes in customized automation solutions, enhancing organizational efficiency through tailored software, API integration, and web systems to streamline and improve operations.”
S2 Data Systems Private Limited
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S2 Data Systems is a premier technology firm focused on leveraging data to create innovative solutions and support businesses in diverse sectors. With a strong grasp of the constantly changing data landscape, we provide state-of-the-art tools, expertise, and insights that enable organizations to max
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
33% API Development & Integration
17% Machine Learning Model Development
12% AI Strategy & Roadmap Consulting
5% Cloud Consulting & SI
AI Summary
“S2 Data Systems specializes in innovative data management and analytics, offering tailored solutions that empower businesses with insights, leveraging AI and advanced technologies for competitive advantage.”
Binaryveda
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We are a specialized consultancy that assists brands and businesses globally by creating tailored digital products. Our clients select us because we cater to those seeking bespoke solutions and are dedicated to digital innovation, all at a reasonable cost. We offer comprehensive services necessary f
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
40% Mobile App Development (iOS & Android)
35% Custom Web Application Development
AI Summary
“Binaryveda is a global consultancy specializing in bespoke digital product development, partnering with clients to deliver innovative, comprehensive solutions at competitive costs.”
IWPDEV
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I WP DEV is a dedicated WordPress development agency established by Alex, a seasoned developer with over ten years of industry experience. The agency has successfully completed more than 150 commercial projects, earning a strong reputation for providing high-quality, tailored WordPress solutions.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
35% E-Commerce Development
25% API Development & Integration
AI Summary
“I WP DEV is a WordPress development agency with over a decade of experience, specializing in custom plugins, API integrations, and tailored e-commerce solutions, ensuring high client satisfaction.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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