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

Orangesoft
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Orangesoft is a comprehensive custom software development firm that creates impactful digital solutions for clients in healthcare and financial services. Our distinguishing feature is our proactive approach to every project. Our talented team of over 100 engineers, designers, and analysts not only d
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Warszawa, Masovian, Pl
Services Provided
25% Mobile App Development (iOS & Android)
40% Custom Web Application Development
20% Backend Development
15% API Development & Integration
AI Summary
“Orangesoft is a custom software development firm with over 100 experts delivering innovative digital solutions, primarily for healthcare and financial sectors, emphasizing proactive collaboration and business transformation.”
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Get Innovation Dev
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Get Innovation Devis is a web development agency located in Moldova that focuses on creating custom websites, WordPress solutions, and API integrations. We assist startups, agencies, and businesses in transforming their digital projects into reality through clean coding, quick turnaround times, and
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
15% E-Commerce Development
60% Custom Web Application Development
25% API Development & Integration
AI Summary
“Get Innovation Dev. is a Moldovan web development agency specializing in custom websites, WordPress, and API integrations, delivering efficient, reliable solutions for startups and businesses.”
NIX
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NIX is a global software engineering firm with more than 3,000 experts, providing solutions that assist everyone, from small and medium-sized businesses to large corporations, in scaling their operations, optimizing processes, and achieving measurable outcomes. REASONS BUSINESSES CHOOSE NIX: ✔️ A si
Highlights
$50-99/hr
Avg Hourly Rate
1000-9999
Employees
Tampa, Florida, Us
Services Provided+3 Services
15% API Development & Integration
13% Mobile App Development (iOS & Android)
23% Custom Web Application Development
12% AI Strategy & Roadmap Consulting
AI Summary
“NIX is a global software engineering firm specializing in AI-driven solutions like automation, analytics, and NLP, helping businesses optimize operations and achieve measurable outcomes.”
ASTAQC CONSULTING
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As industries increasingly embrace digital transformation, delivering high-quality products and services has become essential. AManaged Testing Services company like Astaqc fulfills this need. Astaqc Consulting positions itself as an impartial success partner, offering top-tier services at competiti
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Mumbai, Maharashtra, In
Services Provided+2 Services
17% API Development & Integration
17% Mobile App Development (iOS & Android)
17% AI Strategy & Roadmap Consulting
17% Generative AI
AI Summary
“Astaqc Consulting, a Mumbai-based managed testing services firm, delivers comprehensive software testing and quality assurance solutions globally, ensuring client success through a unique approach and competitive pricing.”
Popaya Technologies LLP
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At Popaya® Technologies, we are not just a technology firm; we are designers of engaging digital environments and innovators of unique experiences. Our mission is rooted in the conviction that every industry requires bespoke tech solutions, which inspires us to be leaders in innovation by providing
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
30% Mobile App Development (iOS & Android)
50% Custom Web Application Development
AI Summary
“Popaya Technologies LLP designs and delivers tailored digital solutions, specializing in web development, mobile apps, and digital marketing across diverse global industries.”
ITProLab
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Welcome to the tech realm of ITProLab, specializing in blockchain! We offer tailored cryptocurrency solutions backed by extensive expertise in Blockchain and Financial Technology. Our skilled team provides innovative software development and IT consulting services. With over thirty-three years of ex
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Blockchain & Web3 Development
AI Summary
“ITProLab delivers innovative custom software and blockchain solutions for fintech, crypto, gaming, and diverse industries, enhancing operations with advanced technology and expert consulting services.”
WizardsHive
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WizardsHive is a software development agency located in Romania, dedicated to creating scalable web applications and digital platforms tailored for growing businesses. We excel in custom backend and frontend development using contemporary technologies such as Laravel, Vue.js, and React. Our services
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% Custom Web Application Development
5% E-Commerce Development
15% API Development & Integration
50% DevOps Engineering
AI Summary
“WizardsHive is a Romanian software development agency specializing in scalable web applications and digital platforms, offering end-to-end custom solutions using modern technologies and long-term client collaboration.”
MAGICSCRIPT DIGITAL PVT. LTD.
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We specialize in software development and have a proven track record of client satisfaction in designing and developing online and mobile applications. As one of the leading firms in the industry, Magicscript Digital Pvt. Ltd. boasts a team proficient in diverse software environments. With numerous
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bhubaneswar, Odisha, In
Services Provided+1 Services
24% API Development & Integration
10% E-Commerce Development
18% UX Research & Usability Testing
15% Interaction Design
AI Summary
“Magicscript Digital Pvt. Ltd. excels in software development and recruitment consultancy, delivering innovative online and mobile applications with a skilled, diverse team committed to excellence.”
VeliTech
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At VeliTech, we are transforming the iGaming industry with our innovative and state-of-the-art product offerings. Our solutions are specifically designed for iGaming companies, featuring advanced back-office tools and exceptional client engagement platforms. VeliHorizon is our sophisticated online c
Highlights
250-999
Employees
Services Provided
50% Custom Web Application Development
30% Backend Development
20% API Development & Integration
AI Summary
“VeliTech delivers comprehensive iGaming solutions, including casino platforms, game aggregation, sportsbook services, marketing automation, payment gateways, and innovative game development for enhanced player engagement.”
DIBS Technologies
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We are a team of innovative and energetic IT solution providers with a wealth of experience, even though we are only eleven years old. We specialize in creating applications for small businesses and entrepreneurs eager to turn their ideas into reality quickly, allowing them to seize market opportuni
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided
20% API Development & Integration
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
5% Legacy System Modernization
AI Summary
“DIBS Technologies offers innovative IT solutions and custom applications for small businesses across diverse sectors, leveraging over a decade of experience to quickly realize market opportunities.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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