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

EMURGO
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EMURGO is an international company specializing in blockchain technology, offering solutions to developers, startups, businesses, and government entities. The company creates high-quality applications, develops tools for developers, invests in new ventures, and offers education in blockchain technol
Highlights
50-249
Employees
Sg
Services Provided+5 Services
3% API Development & Integration
2% Custom Web Application Development
1% Mobile App Development (iOS & Android)
19% Blockchain & Web3 Development
AI Summary
“EMURGO is a global blockchain company providing development tools, custom solutions, investments, and education to startups, businesses, and governments, as a founding member of Cardano.”
Iffort
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Iffort: Advancing Your Digital Transformation Journey At Iffort, we focus on providing state-of-the-art technological solutions for both established enterprises and startups. With over 14 years of experience, our expertise encompasses a wide range of services, including custom software development,
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Sharjah, Ae
Services Provided+17 Services
6% Custom Web Application Development
3% Frontend Development
4% Backend Development
8% Mobile App Development (iOS & Android)
AI Summary
“Iffort delivers custom software and mobile app development, leveraging 14+ years of expertise to support digital transformation across diverse industries with tailored, innovative solutions.”
Solution Bowl India Pvt. Ltd
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Solution Bowl India Pvt. Ltd. is a prominent company specializing in web and mobile app development, recognized for creating innovative, scalable, and secure digital solutions. With over ten years of industry experience and more than 400 successful projects, we have collaborated with startups, small
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+10 Services
3% Frontend Development
4% Mobile App Development (iOS & Android)
2% QA & Software Testing
3% API Development & Integration
AI Summary
“Solution Bowl India Pvt. Ltd. delivers innovative, scalable web and mobile app development services globally, partnering with startups to enterprises to create secure, custom digital solutions.”
Golden Sea Studio ( My Tech )
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Golden Sea Studio is an IT outsourcing and game development company located in Vietnam that was established in 2022. We provide comprehensive digital solutions for startups, small and medium enterprises, and larger corporations across Southeast Asia and beyond. Our expertise lies in four key service
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Vung Tau, Vn
Services Provided+12 Services
2% ERP & CRM Development
5% SaaS Product Development
7% Blockchain & Web3 Development
5% Frontend Development
AI Summary
“Golden Sea Studio, based in Vietnam, delivers IT outsourcing and game development services spanning game creation, software development, AI integration, and blockchain solutions for diverse industries.”
Pixelwolf
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Our goal is to support driven founders in creating top-tier digital products by integrating intelligent design, advanced technology, and the capabilities of AI to enhance user experiences and achieve tangible business results. Currently, Pixelwolf functions as an engaged and strategic digital studio
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
7% Mobile App Development (iOS & Android)
5% API Development & Integration
8% Custom Web Application Development
7% Backend Development
AI Summary
“Pixelwolf is a strategic digital studio partnering with founders to develop advanced SaaS platforms and applications, integrating design, technology, and AI for impactful user experiences and business outcomes.”
O3interfaces
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O3 Interfaces is a consultancy focused on design and technology that specializes in developing scalable, user-focused digital products, enabling organizations to innovate, expand, and stay competitive in a digital landscape. Founded in 2008, we have collaborated with a range of clients including ent
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Islamabad, Pk
Services Provided+12 Services
10% Mobile App Development (iOS & Android)
11% Custom Web Application Development
4% API Development & Integration
5% UX Research & Usability Testing
AI Summary
“O3 Interfaces is a consultancy specializing in user-centered digital products, delivering scalable websites, web and mobile applications, and platforms that enhance business innovation across industries.”
Im Solutions
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IM.Solutions is a comprehensive software development studio located in Yerevan, Armenia. We specialize in designing, developing, and launching modern web applications, ranging from corporate websites to intricate SaaS platforms and internal tools. Our offerings encompass: - Tailored web and mobile
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
10% Custom Web Application Development
6% Mobile App Development (iOS & Android)
5% API Development & Integration
4% E-Commerce Development
AI Summary
“IM.Solutions is an Armenian software studio delivering tailored web, mobile, AI-driven applications, e-commerce, and cloud solutions with scalable, maintainable designs for startups and enterprises globally.”
Phec
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Phec: Recognized Among India’s Leading 20 Innovators in Product Engineering and Web Design Phec is a leader in India’s vibrant product engineering and digital solutions sector, earning a spot as one of the Top 20 Product Engineering Services and Website Design Companies by providing innovative, cli
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Jaunpur, Uttar Pradesh, In
Services Provided+15 Services
6% API Development & Integration
11% E-Commerce Development
6% Product UX Strategy
3% Mobile App UI Design
AI Summary
“Phec is an India-based engineering firm delivering comprehensive software, AI, UI/UX, branding, IT infrastructure, and business consulting services, driving innovation and strategic growth for diverse industries.”
HOOC AI
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Hooc AI Technologies is a digital services partner focused on assisting startups and businesses in building and enhancing their online presence. We merge innovation, advanced technology, and strategic insight to provide tailored solutions that yield tangible results. Our services range from web and
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+4 Services
12% Custom Web Application Development
5% QA & Software Testing
5% E-Commerce Development
8% Mobile App Development (iOS & Android)
AI Summary
“Hooc AI Technologies specializes in digital solutions including web and app development, branding, and digital strategy, empowering businesses to enhance their online presence and achieve growth.”
AB-Soft
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We specialize in creating applications for various sectors in today’s modern landscape, including business software, mobile app development, web development, cloud computing, and IP telephony. AB Soft is dedicated to delivering products that meet the highest standards in the current market. The key
Highlights
50-249
Employees
South San Francisco, California, Us
Services Provided+17 Services
5% Mobile App Development (iOS & Android)
3% API Development & Integration
2% QA & Software Testing
5% Backend Development
AI Summary
“AB-Soft develops innovative business software, mobile and web applications, and cloud-based telephony solutions, serving over 270,000 clients with a focus on quality and continuous improvement.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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