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.

How this list is built

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

SolidWay
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We are a dedicated team focused on developing web applications, mobile apps, and a range of business software. Our group consists of skilled professionals who are eager to turn your ideas and projects into reality, ensuring innovation and quality in every undertaking!
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
35% Custom Web Application Development
15% API Development & Integration
30% DevOps Engineering
20% IT Compliance & Governance
AI Summary
“SolidWay is a professional team specialized in developing innovative web and mobile applications alongside diverse business software, committed to transforming ideas into quality digital solutions.”
kopakov.
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✅ Quick MVP and Startup Creation ✅ Development of SaaS and AIaaS Solutions ✅ Frontend and Full-Stack Development ✅ AI Integration and AI Agents ✅ Cross-Platform Mobile and Web Applications ✅ UI Engineering and Design Frameworks ✅ Database, API, and Cloud Integration ✅ Automation Solutions ✅ Google A
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+3 Services
30% Custom Web Application Development
20% API Development & Integration
10% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
AI Summary
“kopakov specializes in rapid MVP and startup development, offering full-stack and AI-integrated solutions including mobile/web applications, automation, advanced dashboards, and ongoing project maintenance.”
ProgInnova
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Established in 2013, ProgInnova is dedicated to providing high-quality software utilizing modern technologies and leading industry practices. Our services primarily concentrate on Data Integration Projects, Pentaho BI implementations, and tailor-made solutions, which encompass REST APIs, as well as
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
5% Blockchain & Web3 Development
AI Summary
“ProgInnova, founded in 2013, specializes in high-quality software development with expertise in data integration, Pentaho BI, and custom REST APIs, mobile, and web applications.”
Tross
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Tross is a company that enhances application development efficiency through standardization. After conducting thorough research, the team has identified a range of specialized tools that enable them to create high-quality applications quickly. The Tross Engine offers affordable and rapid hosting, CI
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Jersey City, New Jersey, Us
Services Provided+1 Services
25% Custom Web Application Development
20% API Development & Integration
20% Backend Development
20% Frontend Development
AI Summary
“Tross streamlines application development by offering standardized tools, rapid, affordable hosting, CI/CD, full-stack development, and 24/7 support, reducing the need for large tech teams.”
Soluntech
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At Soluntech, we assist startups and businesses in creating smart software that evolves and grows. We provide comprehensive services, including strategy, validation, design, development, and continuous support, ensuring we have the right team in place to develop solutions that offer enduring value q
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Newark, Delaware, Us
Services Provided+8 Services
10% Machine Learning Model Development
8% LLM Integration & Prompt Engineering
7% Workflow Automation (Zapier / Make / n8n)
5% AI Agent & Multi-Agent System Development
AI Summary
“Soluntech partners with startups and businesses to deliver smart software solutions through strategy, design, development, and support, ensuring rapid, responsible, and lasting value creation.”
Netcorp Software Developement
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Boost Your Growth Through Software Development Outsourcing Expand your software development team and enhance digital product development with our services. Our team includes over 250 skilled engineers from Poland and Estonia, serving clients across 16 countries. We offer expertise in software deve
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided+2 Services
15% API Development & Integration
18% Custom Web Application Development
10% Product UX Strategy
12% Mobile App UI Design
AI Summary
“Netcorp Software Development provides expert software engineering, DevOps, data engineering, and cloud services with over 250 professionals, supporting clients in 16 countries to accelerate growth.”
Desol Int
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Since 2016, Desol Int. has been leveraging its skills to develop state-of-the-art software and web applications that have transformed the digital space. Our impressi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+4 Services
15% Custom Web Application Development
5% Mobile App Development (iOS & Android)
13% SaaS Product Development
5% E-Commerce Development
AI Summary
“Desol Int. specializes in innovative software, web, and custom application development with a client-centric approach, delivering over 3,000 projects globally since 2016 with reliable support.”
GILAB DOO Beograd
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GILab is an innovative pioneer that leverages ICT and Geoinformatics. With over ten years of experience and more than 20 international projects in collaboration with respected partners from the EU and the US, we focus on delivering high-quality solutions tailored to your specific needs. In Geoinfo
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Beograd, Belgrade, Rs
Services Provided+2 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
8% API Development & Integration
10% Backend Development
AI Summary
“GILab DOO Beograd specializes in innovative geoinformatics, GIS, web and mobile applications, remote sensing, spatial data science, and consulting, delivering tailored, data-driven geospatial solutions with international expertise.”
Nar Technology Services
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Nar is a provider of technology services that delivers managed solutions and project-oriented resources. Our developers work full-time as integral team members with our partner clients and are based at Nar’s headquarters in Turkey. We utilize agile development practices, and our developers specializ
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Istanbul, Istanbul, Tr
Services Provided+2 Services
30% Custom Web Application Development
20% API Development & Integration
20% Backend Development
15% Frontend Development
AI Summary
“Nar Technology Services offers managed technology solutions with specialized developers in multiple programming languages and DevOps tools, employing agile practices from its headquarters in Turkey.”
Visualma
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We focus on Virtual Production, Virtual Reality, Augmented Reality, 3D Mapping, Virtual Architecture, and Animation.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Guadalajara, Jalisco, Mx
Services Provided+3 Services
5% Explainer Video Production
8% Brand Film & Corporate Video
15% Motion Graphics & Visual Effects
17% 2D & 3D Animation
AI Summary
“Visualma specializes in immersive technologies including Virtual Production, Virtual and Augmented Reality, 3D Mapping, Virtual Architecture, and Animation, delivering advanced digital experiences across multiple sectors.”

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Latest insights & expert perspectives

Explore data-backed surveys with inputs from top industry experts.

Minimum project sizes stated by UX audit firms listed on Edverise, with the no-minimum and $1,000 bands shaded

Vendor Selection

UX Audit Cost: Price Tables Say $8,000, Most Firms Start Lower

Agency tables put a full UX audit at $8,000 and up. 60% of 3,038 listed audit firms state a $1,000 minimum or none. Here is what to pay and what to demand.

Akash Mohapatra

11/9/2026