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

Synap
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Synap is a group of problem solvers rather than salespeople. By selecting Synap for your software development requirements, you gain access to a team of highly skilled developers, along with a UI/UX designer, a technical project manager, and a business analyst dedicated to your project. We excel in
Highlights
$10,000+
Min Project Size
10-49
Employees
Reno, Nevada, Us
Services Provided+2 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% E-Commerce Development
15% API Development & Integration
AI Summary
“Synap delivers custom software development with expert UI/UX design, specializing in mobile and e-commerce solutions, supported by skilled teams and Agile methodologies for quality, tailored results.”
Eastgate Software JSC
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Eastgate Software assists businesses in enhancing reliable software delivery by providing high-quality remote engineering teams and tailored development projects. Established in Vietnam with consulting branches in Germany and Japan, we collaborate with product companies and enterprises that prioriti
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Hanoi, Vn
Services Provided+9 Services
13% API Development & Integration
8% Mobile App Development (iOS & Android)
13% Legacy System Modernization
18% Custom Web Application Development
AI Summary
“Eastgate Software JSC is a Vietnam-based company providing expert remote engineering teams and tailored software development services, trusted by SMEs and Fortune 500 firms globally.”
TechEunovate
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We are a technology-focused organization dedicated to revolutionizing the way businesses interact with customers and enable individuals through innovative solutions. Our enthusiasm is rooted in using technology to address intricate problems. Rather than simply being a service provider, we see oursel
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% CRM Consulting and SI
AI Summary
“TechEunovate delivers innovative technology solutions that transform business-customer interactions, emphasizing strategic partnerships and investing in talent to drive client success and future growth.”
NORTHLAKE
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At Northlake, we serve as your dependable ally in the realm of Information Technology. Our knowledge covers IT outsourcing, team augmentation, and tailored software development, leveraging advanced technologies including .NET, Java, React, Angular, and Azure Cloud. We provide creative solutions that
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% IT Staff Augmentation
AI Summary
“Northlake specializes in IT outsourcing, team augmentation, and custom software development using technologies like .NET, Java, React, Angular, and Azure Cloud to deliver innovative, efficient solutions.”
1artifactware
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At 1artifactware, we focus on providing innovative and scalable software solutions designed to meet the distinct needs of businesses. Our strengths include custom software development, API integration, and cloud-based solutions, enabling our clients to turn their visions into reality. With more than
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Cloud Consulting & SI
AI Summary
“1artifactware delivers innovative, scalable custom software and cloud solutions across industries, leveraging over a decade of experience to enhance business efficiency and growth.”
AnkyloSoft
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We are a Software Agency that assists Digital Platforms in quickly addressing growth challenges through tailored web app development. With our experience in creating everything from scalable systems to specialized web platforms, payment gateways, APIs, and advanced bots, we know how to identify and
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% AI Strategy & Roadmap Consulting
AI Summary
“AnkyloSoft is a software agency specializing in tailored web app development, API integration, AI solutions, and consulting to accelerate growth, scalability, security, and customer retention for digital platforms.”
Web Projects Lab
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Transforming bold concepts into tangible solutions, Web Projects Lab offers top-notch software development for startups and businesses. We prioritize complete transparency over the traditional "black box" agency approach. Why partner with us? Begin with a Pilot: Evaluate our services with a pre-paid
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Machine Learning Model Development
AI Summary
“Web Projects Lab delivers transparent, expert software development for startups and businesses, offering scalable solutions with real-time budget tracking and flexible engagement models.”
STX Next
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STX Next is the largest digital engineering partner in Europe with a focus on Python, specializing in Data, AI, and Cloud solutions that enable organizations to derive business value from their data. With delivery centers located in Poland and Mexico, we blend extensive technical skills with a flexi
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Poznan, Greater Poland, Pl
Services Provided+2 Services
23% Custom Web Application Development
10% API Development & Integration
20% Business Intelligence (BI) Dashboard Development
13% Data Strategy Consulting
AI Summary
“STX Next is Europe's largest digital engineering partner specializing in Python, delivering data, AI, and cloud solutions across industries with nearshore teams in Poland and Mexico.”
SpdLoad
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We concentrate on two models: assisting non-technical founders in creating a minimum viable product to achieve product/market fit, and expanding technical teams for small and medium-sized enterprises as well as well-funded startups. Our services include: Feel free to contact us, and we’ll be happy t
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Kharkiv, Kharkiv, Ua
Services Provided+1 Services
15% Mobile App Development (iOS & Android)
25% Custom Web Application Development
10% API Development & Integration
30% Product UX Strategy
AI Summary
“SpdLoad specializes in developing MVPs for non-technical founders and expanding technical teams for SMEs and startups, offering tailored software development solutions.”
Avatarctic
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We are a small, specialized team of software developers, architects, and analysts with deep ties to Israel’s technology and AI innovation scene. Our focus is on designing and creating personalized AI-powered tools that streamline documentation, decision-making, and dashboard management for sectors i
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Tel Aviv-Yafo, Il
Services Provided
35% Custom Web Application Development
15% API Development & Integration
30% AI Strategy & Roadmap Consulting
20% LLM Integration & Prompt Engineering
AI Summary
“Avatarctic is an Israeli software development team specializing in AI-powered tools for legal, finance, and healthcare sectors, offering outsourcing and outstaffing with expertise in Kotlin, Flutter, Golang, Python, and Node.js.”

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Latest insights & expert perspectives

Explore data-backed surveys with inputs from top industry experts.

Minimum project sizes stated by UX audit firms listed on Edverise, with the no-minimum and $1,000 bands shaded

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