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

Needham Tech Studio
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Needham Tech Studio is a web development company located in Cincinnati that focuses on creating tailored websites and scalable web applications for small businesses. We develop sleek, modern websites prioritizing speed, usability, and lead generation. Each project is crafted with meticulous developm
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Ludlow, Kentucky, Us
Services Provided
40% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
30% E-Commerce Development
AI Summary
“Needham Tech Studio, Cincinnati-based, specializes in custom web development for small businesses, focusing on modern, responsive designs that enhance usability, lead generation, and future scalability.”
SwyTapp
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SwyTapp is a global studio focused on game design and development, excelling in comprehensive video game production. We can handle projects of any complexity based on client needs. Our expertise sets us apart from others. If you believe we could be the ideal partner for your game development, or if
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided
50% Mobile App Development (iOS & Android)
10% Blockchain & Web3 Development
25% Custom Web Application Development
15% API Development & Integration
AI Summary
“SwyTapp is a global game design and development studio specializing in comprehensive video game production and quality IT outsourcing, delivering tailored solutions for projects of any complexity.”
Eminence Technology
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About Us At Eminence Technology, we excel in developing state-of-the-art enterprise solutions driven by sophisticated AI and machine learning technologies. From predictive analytics and natural language processing to deep learning and AI-based automation, we go beyond simple chatbots to address intr
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided+5 Services
18% Custom Web Application Development
13% Mobile App Development (iOS & Android)
15% API Development & Integration
5% Blockchain & Web3 Development
AI Summary
“Eminence Technology delivers advanced AI and machine learning enterprise solutions, specializing in predictive analytics, automation, and blockchain integration to optimize workflows and drive business innovation.”
Devsecure
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DevSecure is a cybersecurity firm that focuses on penetration testing and vulnerability assessments. We assist organizations in recognizing and addressing security flaws before they can be targeted by attackers. With our skills in ethical hacking and sophisticated reconnaissance methods, we offer cu
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
40% QA & Software Testing
AI Summary
“DevSecure specializes in penetration testing and vulnerability assessments, delivering tailored cybersecurity solutions to protect European and U.S. companies from emerging threats while ensuring compliance.”
Kart Builds Studio
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Kart Builds is a web design and development agency dedicated to creating websites that drive conversion for entrepreneurs and startups. We integrate design, development, and conversion strategies to transform your website into a reliable source for acquiring clients.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Kanpur, Uttar Pradesh, In
Services Provided
40% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
30% E-Commerce Development
AI Summary
“Kart Builds Studio is a web design and development agency specializing in creating conversion-driven websites for entrepreneurs and startups by integrating design, development, and conversion strategies.”
A
Arham Technosoft
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Since 2009, we have been a prominent provider of solutions in design, software engineering, maintenance, and consulting, consistently enhancing revenue and delivering exceptional client experiences. Our dedication to our work keeps us competitive in the market, resulting in numerous awards each year
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
15% API Development & Integration
10% E-Commerce Development
20% CRM Consulting and SI
AI Summary
“Since 2009, Arham Technosoft delivers tailored software design, development, and consulting solutions, supporting startups to enterprises with innovative apps, IT infrastructure, and responsive web services.”
iTech4Web
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Information on iTech4Web Located in Chicago, USA, iTech4Web boasts a skilled delivery team across the USA and Europe. We focus on providing complete turnkey solutions for web development and CMS projects, which encompass comprehensive UI/UX design customized for businesses and organizations. Our
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Lisle, Illinois, Us
Services Provided+2 Services
23% Custom Web Application Development
13% API Development & Integration
7% Progressive Web App (PWA) Development
7% Legacy System Modernization
AI Summary
“iTech4Web, headquartered in Chicago with teams across the USA and Europe, delivers turnkey web development and CMS solutions featuring customized UI/UX design using technologies like Drupal, WordPress, PHP, and React.”
Dagamma
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Dagamma provides comprehensive WordPress development services that cover everything from strategy and planning to ongoing advice and support. We focus on creating designs centered around the customer and bring them to life using WordPress. Our expertise includes enhancing performance, scaling, manag
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Kv, Ua
Services Provided
30% Custom Web Application Development
20% API Development & Integration
35% Web App UI Design
15% Interaction Design
AI Summary
“Dagamma offers comprehensive WordPress development services including strategy, design, performance enhancement, scaling, data migration, and API integration for businesses of all sizes.”
OECUMENICAL TECH SOLUTION (OPC) PRIVATE LIMITED
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We offer AI-driven automation solutions tailored for businesses of all sizes. Our product range features an AI Telecaller, AI Receptionist, WhatsApp Lead Handler, AI Voice Agent, and Social Media Management Automation. These solutions enable companies to streamline customer interactions, efficiently
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+12 Services
3% Workflow Automation (Zapier / Make / n8n)
1% Other IT Consulting and SI
3% AI Agent & Multi-Agent System Development
4% Custom AI Chatbot Development
AI Summary
“OECUMENICAL TECH SOLUTION (OPC) PRIVATE LIMITED specializes in AI-driven automation products that optimize customer interactions, lead management, and digital marketing to accelerate business growth globally.”
Dreamers Inc.
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We are a research and development team dedicated to exploring new technologies and tackling complex challenges. Our expertise lies in machine learning, decentralized systems, and cybersecurity. We focus on projects that present significant technological challenges, where advancements in technology a
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Los Angeles, California, Us
Services Provided+4 Services
13% Custom Web Application Development
8% Mobile App Development (iOS & Android)
18% API Development & Integration
12% Blockchain & Web3 Development
AI Summary
“Dreamers Inc. is a research and development team specializing in machine learning, decentralized systems, and cybersecurity, prioritizing collaborative innovation and ethical technological advancement for humanity's benefit.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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