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

stelarc
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Stelarc is a team of engineers, designers, and strategists focused on addressing the most intricate technical issues faced by organizations worldwide.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Kozhikode, Kerala, In
Services Provided+1 Services
25% Custom Web Application Development
18% API Development & Integration
7% E-Commerce Development
30% CRM Consulting and SI
AI Summary
“Stelarc is a multidisciplinary team of engineers, designers, and strategists dedicated to solving complex technical challenges for diverse organizations globally with innovative solutions.”
ASP.Net Zero Developers
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Welcome to ASP.NET Zero Developers - Your Pathway to Cutting-Edge Web Application Development. At ASP.NET Zero Developers, we do more than just code; we design and innovate with excellence at our core. Our chief goal is to propel your business into the future by carefully developing web applications
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+4 Services
30% Software Development Services
10% API Development & Integration
10% QA & Software Testing
10% DevOps Engineering
AI Summary
“ASP.Net Zero Developers excels in Software Development, offering custom web and mobile app development, API integration, QA testing, DevOps services, and enterprise app modernization, demonstrating comprehensive capabilities in delivering tailored software solutions.”
DataTek Solutions, Inc.
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DataTek is a software development firm located in the United States, specializing in tailored technology solutions for businesses around the globe. Established by Stuart Smith, a highly experienced professional in software and business intelligence development with over 18 years in the field, DataTe
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
North Palm Beach, Florida, Us
Services Provided
35% Custom Web Application Development
15% API Development & Integration
35% BI & Big Data Consulting & SI
15% CRM Consulting and SI
AI Summary
“DataTek Solutions, Inc. delivers customized technology and software development services, leveraging extensive expertise to address complex business challenges and support global client growth.”
ArdentInfo Solutions
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At ArdentInfo Solutions, we are dedicated to transforming your concepts into outstanding digital experiences. As a premier mobile app development firm, we excel in crafting tailor-made solutions across various platforms and technologies. Our Services: - **Mobile App Development:** We specialize in
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
10% API Development & Integration
5% E-Commerce Development
10% Custom Web Application Development
AI Summary
“ArdentInfo Solutions delivers tailored mobile and web applications, e-commerce, API integration, AI consulting, and cloud services leveraging advanced technologies for innovative digital experiences and client success.”
SmartGrit Technologies
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At SmartGrit Technologies, we reject the notion of merely "getting it done." With more than nine years of industry experience, we guarantee that every line of code has a clear business objective. Our founders, who have extensive backgrounds in mobile ecosystems and automation, connect innovative des
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
35% Mobile App Development (iOS & Android)
25% Custom Web Application Development
20% API Development & Integration
10% E-Commerce Development
AI Summary
“SmartGrit Technologies leverages over nine years of expertise in mobile ecosystems and automation to deliver innovative, business-driven digital solutions with robust engineering and design.”
eesy-innovation GmbH
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eesy-innovation specializes in providing comprehensive development services for complete IoT solutions. The company delivers end-to-end services across various industries, including healthcare, sports, smart homes, and more. Its key areas of expertise encompass hardware design (such as schematics an
Highlights
10-49
Employees
Services Provided+2 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
15% AI Strategy & Roadmap Consulting
AI Summary
“eesy-innovation GmbH offers end-to-end IoT development services across industries, specializing in hardware, firmware, cloud platforms, and AI software, delivering innovative, market-ready solutions with expert support.”
Nexa Point
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I am dedicated to supporting founders in establishing app and SaaS-based startups. My expertise goes beyond just development; I have a strong background in managing dynamic operations teams, enhancing business processes, and providing tech and business consulting, which gives me a deep understanding
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Byron Bay, Au
Services Provided
40% Mobile App Development (iOS & Android)
45% Custom Web Application Development
15% API Development & Integration
AI Summary
“Nexa Point supports app and SaaS startups by combining tech development, operations management, and consulting to guide businesses from MVP creation through strategic growth and scaling.”
Sutantra Technologies
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We are an international technology consulting and digital solutions firm focused on professional web design and development, application development, and bespoke software solutions. At Sutantra Technologies, we integrate innovation, expertise, and a client-focused mindset to provide customized solut
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
35% Custom Web Application Development
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Sutantra Technologies is an international consulting firm specializing in web and application development, delivering bespoke digital solutions through innovative, client-focused expertise to support business success.”
Flashy Web Solutions
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I'm Saood from Flashy Web Solutions, a reputable software development company with over a year of demonstrated success in providing high-performance custom solutions. Our areas of expertise include: ✔ Custom Websites – visually appealing and designed for high conversion. ✔ Custom CRM & ERP – streaml
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided
45% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
10% Blockchain & Web3 Development
AI Summary
“Flashy Web Solutions delivers high-performance custom software including websites, CRM, ERP, mobile apps, chatbots, and SEO services, supporting diverse industries with tailored, growth-focused solutions.”
Peak Web Technologies
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Peak Web Technologies, located in Wilmington, Delaware, is a web design and digital marketing agency catering to small businesses. We create websites, manage local SEO, implement AI chatbots, CRMs, and business automation solutions that assist contractors, restaurants, salons, and service providers
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Newark, Delaware, Us
Services Provided
38% Custom Web Application Development
12% API Development & Integration
50% Search Engine Optimization (SEO)
AI Summary
“Peak Web Technologies is a Delaware-based agency offering web design, digital marketing, AI chatbots, CRM, and automation to help small businesses improve online visibility and client acquisition.”

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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