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

Code Pros
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Code Pros serves as a technical execution partner for startups, agencies, and growing businesses in need of reliable engineering and structured delivery processes. We specialize in designing, building, and enhancing high-performance websites, platforms, AI systems, and essential digital products. Ou
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
35% Custom Web Application Development
20% Machine Learning Model Development
20% API Development & Integration
20% Software Development Services
AI Summary
“Code Pros excels in Software Development through custom web application development, API integrations, SaaS products, backend development, and specialized CMS customization, delivering reliable and scalable digital platforms for diverse industries.”
Best Labz
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Do you have a startup idea and require tailored software solutions? Before spending excessively in the US, take a moment to consider this: $1 USD is roughly equivalent to ₹85 Rupees in India. That's a significant difference! This is where we come in. At BestLabz, we're offering custom software solut
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
5% E-Commerce Development
AI Summary
“Best Labz offers affordable, high-quality custom software development and talent solutions for US and European clients, specializing in SaaS, e-commerce, mobile apps, and enterprise systems.”
Techtonify
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Techtonify is a technology firm dedicated to creating comprehensive digital solutions for businesses. We assist organizations in turning their concepts into fully operational systems by overseeing the entire process—ranging from strategy and UX/UI design to custom software development, deployment, o
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
80% Custom Web Application Development
20% API Development & Integration
AI Summary
“Techtonify delivers custom digital solutions and proprietary products like OptiEstate, enabling businesses to optimize operations, enhance efficiency, and drive growth through technology integration.”
Atomic Object
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Atomic Object develops tailored software solutions that help our clients achieve their business goals. Our team, located in the U.S., creates new products, improves current offerings, modernizes outdated systems, and incorporates AI into clients' software infrastructures. As an employee-owned compan
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Grand Rapids, Michigan, Us
Services Provided+1 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
20% API Development & Integration
15% SaaS Product Development
AI Summary
“Atomic Object is a U.S.-based, employee-owned software firm delivering custom solutions, modernizing systems, and integrating AI to advance clients' business objectives across industries.”
GITCS
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
GITCS is a well-regarded IT software consulting firm located in North East India, boasting a team of specialists with extensive experience in providing exceptional software solutions to various businesses. Their proficiency and dedication to client satisfaction have established them as a respected n
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Guwahati, Assam, In
Services Provided
35% Custom Web Application Development
25% API Development & Integration
20% E-Commerce Development
20% Mobile App Development (iOS & Android)
AI Summary
“GITCS is a reputable IT software consulting firm in North East India, delivering customized software solutions through experienced specialists and a client-focused approach to ensure optimal outcomes.”
A
Auto.AI
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
It seems you've discovered us, but don't worry—you're right on time! The universe has guided you here. As automation service providers, we can't stand to watch our clients or friends labor through tedious manual tasks. That's why we handle the entire process for you. Just pass the task to us, and we
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
17% AI Agent & Multi-Agent System Development
12% Custom AI Chatbot Development
5% AI Strategy & Roadmap Consulting
33% API Development & Integration
AI Summary
“Auto.AI specializes in automating manual tasks by designing customized AI-driven systems, enabling clients to save time and improve efficiency through tailored automation solutions.”
Village Software Engineering
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Greetings! We are a dedicated team of innovative thinkers committed to enhancing your organization's performance. Our expertise lies in tailored Business Application Development, Enterprise Integration, Data Analytics, and Business Intelligence solutions. We offer specialized consultancy services ac
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Liverpool, England, Gb
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% Legacy System Modernization
50% Business Intelligence (BI) Dashboard Development
AI Summary
“Village Software Engineering specializes in customized Microsoft-based business applications, enterprise integration, and data analytics, serving diverse industries since 1986 with a collaborative, innovative team.”
Spacecore
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Spacecore specializes in providing customized IT solutions, guided by a robust set of core values aimed at helping your business gain a comprehensive understanding of the technology landscape that suits your requirements. Our confidence stems from hands-on experience, allowing us to make strong comm
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Chisinau, Chisinau, Md
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% E-Commerce Development
50% ERP Consulting and SI
AI Summary
“Spacecore delivers customized IT and AI-driven solutions across sectors like SaaS, Healthtech, and Fintech, leveraging expertise and advanced technologies to address complex business challenges effectively.”
Foresight Mobile
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Foresight Mobile is a mobile app development firm located in Manchester, UK, with additional offices in Birmingham and London. Since 2017, we have developed over 50 Flutter apps and are active contributors on pub.dev. In 2025, we began directly managing the flutter_markdown_plus package, previously
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Manchester, England, Gb
Services Provided
70% Mobile App Development (iOS & Android)
10% API Development & Integration
10% Software Development Services
10% Custom Web Application Development
AI Summary
“Foresight Mobile excels in Software Development with expertise in Mobile App Development (iOS & Android), API Development & Integration, and Custom Web Application Development. Their senior team and notable client projects demonstrate robust capabilities in delivering tailored software solutions.”
Bytewise Solutions LTD
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At Bytewise Solutions, we prioritize excellence in website design and digital marketing in every project we handle. Our process starts with a comprehensive understanding of our clients’ objectives, enabling us to customize our IT services and solutions to address their unique requirements. This esse
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Scunthorpe, Gb
Services Provided
25% API Development & Integration
25% Cloud Consulting & SI
25% Search Engine Optimization (SEO)
25% Web App UI Design
AI Summary
“Bytewise Solutions delivers tailored website design and digital marketing services, focusing on client objectives to provide efficient, customized IT solutions ensuring satisfaction and excellence.”

...

...

...

Latest insights & expert perspectives

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

Stated minimum project sizes among the firms listed under software development services on Edverise, with the $50,000 band shaded

Vendor Selection

Questions to Ask a Software Development Agency: Six With Proof

A vetting script for second-round agency calls: six questions, the document each answer has to produce, and what a directory listing or a badge really proves.

Nihar Ranjan Rout

10/31/2026

Three software development quotes of $38,000, $94,000 and $210,000 converted to effective hourly rates of $79, $73 and $87.50

Vendor Selection

How to Compare Software Development Quotes Priced 5x Apart

Three bids for the same build are rarely comparable as written. A normalization checklist, a weighted grid adapted from FAR Part 15.3, and the hourly arithmetic.

Akash Mohapatra

10/31/2026

Chart of minimum project size stated by firms listed under AI agent development on Edverise, with the $50,000 band highlighted

Vendor Selection

AI Agent Development Cost: Build, Tokens, Reliability

An AI agent has three costs. Compute the monthly token bill from published list prices, then set the build quote against what listed firms actually charge.

Santanu Prasad Sahoo

10/31/2026

Check All Our Blogs

One Platform. One Promise. One Trust.

Edverise is building the trusted way to find tech vendors. List your company early, or talk to us about backing the platform.

Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

A

Where buyers look next

Latest insights & expert perspectives

Questions to Ask a Software Development Agency: Six With Proof

How to Compare Software Development Quotes Priced 5x Apart

AI Agent Development Cost: Build, Tokens, Reliability

One Platform. One Promise. One Trust.