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

F
ForeFastSolution
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ForeFastSolutions focuses on advanced mobile and web applications, utilizing technologies such as Ruby on Rails, PHP, .Net, Android, and iOS. Our skilled team provides customized solutions that ensure your project surpasses expectations and remains at the forefront of innovation. Discover new possib
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+12 Services
7% API Development & Integration
12% Custom Web Application Development
12% Mobile App Development (iOS & Android)
4% E-Commerce Development
AI Summary
“ForeFastSolution is a versatile company delivering innovative solutions across various industries, focusing on quality, efficiency, and customer satisfaction to drive sustainable growth.”
Achek
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Achek Digital Solutions is a contemporary technology firm that assists both individuals and businesses in expanding their online presence. Our areas of expertise include website design and development, mobile applications, digital marketing, branding, UI/UX design, hosting, domain registration, cybe
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
15% Custom Web Application Development
10% Software Development Services
10% E-Commerce Development
10% Legacy System Modernization
AI Summary
“Achek Digital Solutions offers comprehensive technology services including web and mobile development, digital marketing, branding, cybersecurity, and hosting to enhance online presence for individuals and businesses.”
Carras Studio
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CarrasStudio is a web design and SEO agency located in North Dakota, dedicated to aiding small businesses in Williston and nearby areas in developing fast, conversion-oriented websites that rank well and attract leads. We specialize in creating contemporary, mobile-friendly websites and e-commerce s
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
10% Custom Web Application Development
6% API Development & Integration
9% E-Commerce Development
8% Mobile App UI Design
AI Summary
“Carras Studio, based in North Dakota, provides small businesses with modern web design, mobile-friendly e-commerce, and comprehensive SEO to improve online performance and lead generation.”
B
Billioncod
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Billioncod links programmers with actual projects to develop their skills and understanding of new technologies. Our platform supports developers' growth while giving companies access to talented professionals at reasonable prices. We provide various services aimed at equipping coders and benefiting
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+6 Services
5% QA & Software Testing
7% Backend Development
3% E-Commerce Development
5% API Development & Integration
AI Summary
“Billioncod connects programmers with real projects to enhance skills and technology expertise, offering businesses access to talented developers and fostering professional growth and career advancement.”
T
Teners
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We are not just a software company; we aspire to be your partners in achieving success. We recognize the impact of technology and its ability to change lives and businesses. That’s why we are committed to empowering individuals, companies, and organizations to create solutions and shape their digita
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
8% E-Commerce Development
18% Mobile App Development (iOS & Android)
7% API Development & Integration
17% Custom Web Application Development
AI Summary
“Teners partners with clients to deliver tailored web and mobile software solutions, focusing on innovation, user-centric design, and comprehensive development services to drive digital success.”
The Projects All
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The Projects All is a remote-first IT and creative technology firm established in 2025, headquartered in Nepal. We cater to clients worldwide by providing practical and forward-thinking digital solutions that empower businesses to thrive in a rapidly evolving landscape. Our expertise lies in custom
Highlights
10-49
Employees
Services Provided+10 Services
5% Mobile App Development (iOS & Android)
4% API Development & Integration
6% Custom Web Application Development
2% E-Commerce Development
AI Summary
“The Projects All, a remote-first Nepalese IT firm, delivers custom software, IT services, multimedia, and marketing solutions, fostering trusted partnerships to transform visions into practical digital results.”
AIZ Solutions
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AIZ Solutions: Your Reliable Partner for IT Services Based in Bangladesh with a branch in the USA, AIZ Solutions provides tailored IT solutions designed to foster business growth. Our skilled team of developers, designers, consultants, and copywriters is dedicated to offering high-quality, economi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+13 Services
2% E-Commerce Development
2% API Development & Integration
7% Custom Web Application Development
3% Mobile App Development (iOS & Android)
AI Summary
“AIZ Solutions offers comprehensive IT services including custom software development, cloud management, ERP/CRM implementation, and outsourcing, ensuring cost-effective, reliable solutions tailored to business needs.”
D
Digitize HQ
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Digitize HQ is a digital agency located in Kingston, Jamaica, established in 2018. The firm specializes in creating top-notch web development, mobile apps, ecommerce platforms, AI automation workflows, and tailor-made enterprise solutions for businesses in Jamaica, the Caribbean, North America, and
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
10% Custom Web Application Development
6% Mobile App Development (iOS & Android)
5% E-Commerce Development
4% API Development & Integration
AI Summary
“Digitize HQ, a Kingston-based digital agency, offers custom web, mobile, and enterprise solutions with AI automation, serving diverse sectors and ensuring scalable, ROI-driven digital products.”
Horizon IT Security And Services Ltd.
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We offer web design, development, and hosting services to help your business establish a solid online presence. Our professional web services are available throughout the UK, including regions like Wigan, Manchester, Bristol, London, and Bolton. Our range of services includes: • eCommerce Website
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+7 Services
10% E-Commerce Development
6% Mobile App Development (iOS & Android)
4% API Development & Integration
12% Search Engine Optimization (SEO)
AI Summary
“Horizon IT Security And Services Ltd. provides comprehensive web design, development, hosting, mobile apps, SEO, and cloud solutions across the UK, enhancing business digital presence.”
Costavisions
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A venture studio operating in the US and Latin America, focused on projects led by Latinx and minority entrepreneurs, dedicated to building companies since 2012.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+16 Services
8% Custom Web Application Development
4% API Development & Integration
3% Frontend Development
3% Mobile App Development (iOS & Android)
AI Summary
“Costavisions is a venture studio active in the US and Latin America since 2012, supporting Latinx and minority-led entrepreneurial projects with dedicated company-building expertise.”

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