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

The Forge Agency
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The Forge Agency is a web agency that focuses on tailored solutions, AI, and automation. We handle everything from website, app, and SaaS development to backend automation and AI integration. Whatever your vision is, we can bring it to life. If you need assistance, we're also here to provide guidanc
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
24% API Development & Integration
10% E-Commerce Development
33% Robotic Process Automation (RPA)
33% Operational Process Consulting
AI Summary
“The Forge Agency is a web agency specializing in tailored web, app, and SaaS development, integrating AI and automation to deliver customized digital solutions and expert guidance.”
Tantrija Enterprises
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**Tantrija: Innovating Beyond Boundaries** Tantrija is a tech company focused on Web3 and blockchain development, as well as web and mobile app creation and game development. We equip businesses with advanced solutions that prioritize security, scalability, and smooth digital experiences. **Cor
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Blockchain & Web3 Development
15% API Development & Integration
20% Mobile App Development (iOS & Android)
15% Custom Web Application Development
AI Summary
“Tantrija Enterprises specializes in blockchain, Web3, web/mobile app, and game development, delivering secure, scalable digital solutions with multi-platform support and advanced technologies.”
CDOXS
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CDOXS is a worldwide software development and digital transformation firm with operations in Pakistan, Saudi Arabia, and the United States. Established in 2018, we focus on creating scalable, secure, and innovative digital solutions for startups, small to medium-sized enterprises, and large corporat
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Riyadh, Sa
Services Provided+2 Services
20% Backend Development
15% API Development & Integration
15% Custom Web Application Development
25% Other IT Consulting and SI
AI Summary
“CDOXS is a global software and digital transformation firm offering custom development, AI, SaaS, ERP, and cloud solutions to diverse businesses from startups to corporations.”
26 Lines Of Code
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Hello, I'm Michael, the CEO of 26 Lines of Code. We prioritize people in the process of developing and designing your next innovative concept. Regardless of your current phase, we’re here to collaborate with you and actualize your vision. Crafting an app that resonates with users can be a demanding
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Miami, Florida, Us
Services Provided+2 Services
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% Generative AI
AI Summary
“26 Lines Of Code is a U.S.-based software development company specializing in app design, strategy, branding, and launch, leveraging decades of experience to realize clients' innovative visions.”
abz.agency®
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abz.agency® is a software development firm that specializes in creating complex and customized solutions utilizing web technologies, including browser extensions, mobile applications, and high-performance, high-load solutions. Currently, our team consists of over 95 members across 8 locations, with
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided
50% Custom Web Application Development
15% API Development & Integration
35% Mobile App Development (iOS & Android)
AI Summary
“abz.agency® is a software development firm specializing in complex, high-performance web solutions, browser extensions, and React Native apps, delivering projects on schedule with expert teams across Europe.”
DCXV
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European hosting company featuring Tier III data centers located in the Czech Republic, Portugal, and Lithuania. They provide dedicated servers, cloud servers, and managed infrastructure. DCXV delivers high-performance cloud hosting, dedicated servers, and IPv4 brokerage services. They ensure a depe
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
14% Custom Web Application Development
20% API Development & Integration
33% Cloud Consulting & SI
33% Managed IT Services
AI Summary
“DCXV is a European hosting provider with Tier III data centers offering dedicated servers, cloud solutions, IPv4 brokerage, and managed infrastructure across Czech Republic, Portugal, and Lithuania.”
CortexWaveTech
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We emphasize quality, efficiency, and innovation, guaranteeing that each project is executed with accuracy and attention to detail. From the initial idea to the final launch, we concentrate on fulfilling your specific requirements while sticking to schedules, providing outstanding results at every s
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
20% API Development & Integration
18% Mobile App Development (iOS & Android)
12% E-Commerce Development
50% CRM Consulting and SI
AI Summary
“CortexWaveTech excels in delivering high-quality, innovative solutions with precise execution and efficiency, ensuring tailored project fulfillment and exceptional outcomes from concept to launch.”
Rubico
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Rubico is a high-quality dualshore software development and engineering partner that combines US-based technical specialists and American personnel with Indian development teams to create software that is effective, durable, and supports business objectives.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Austin, Texas, Us
Services Provided+1 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% E-Commerce Development
20% QA & Software Testing
AI Summary
“Rubico is a dualshore software development partner integrating US-based experts and Indian teams to deliver durable, effective software solutions aligned with business goals.”
Dotworld Technologies Pvt Ltd
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Dotworld Technologies, located in Coimbatore, is a technology studio that focuses on advanced AR/VR/XR solutions, custom software development, mobile and web applications, robotics, AI/ML, and digital twins. Since 2018, we have provided impactful immersive experiences and enterprise software solutio
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Services Provided
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Dotworld Technologies offers advanced AR/VR/XR, custom software, AI/ML, robotics, and digital twin solutions, delivering immersive experiences and enterprise software for diverse sectors since 2018.”
CodeTank Labs, LLC
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CodeTank Labs is a software development team located in Tennessee, featuring both frontend and backend developers. Our technical skills cover a range of areas, including web applications, API development, mobile app creation for iOS and Android, and immersive reality projects such as virtual, augmen
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Knoxville, Tennessee, Us
Services Provided
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“CodeTank Labs, a Tennessee-based software development team, specializes in full-stack web and mobile apps, API development, and immersive reality projects using diverse modern technologies.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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