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

Poshmaal Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Poshmaal Technologies, founded in 2023, provides a wide range of IT services aimed at improving your business's efficiency and security. Our skilled team guarantees that your IT infrastructure is strong, secure, and adaptable, enabling you to concentrate on your main business activities. We focus on
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Islamabad, Islamabad Capital Territory, Pk
Services Provided+1 Services
30% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
30% SaaS Product Development
AI Summary
“Founded in 2023, Poshmaal Technologies delivers comprehensive IT solutions globally, specializing in mid-market businesses with innovative software services and dedicated client support to enhance infrastructure efficiency and security.”
Zillion Infotech
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Zillion Infotech is a progressive software development firm that focuses on creating scalable web and mobile solutions for startups, small and medium-sized enterprises, and large corporations. With a strong expertise in web, mobile, and cloud-native technologies, we provide high-performance, secure,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Surat, Gujarat, In
Services Provided+2 Services
20% Custom Web Application Development
13% Mobile App Development (iOS & Android)
15% API Development & Integration
2% E-Commerce Development
AI Summary
“Zillion Infotech delivers scalable web, mobile, and cloud-native solutions with expertise in development, API integration, DevOps, and design, fostering client-focused, innovative digital transformations.”
Seaside Software Solutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Seaside Software Solutions offers IT consulting services in the New York City region. Founded in 2010, it is an independent consulting firm built on extensive experience in solution architecture, software development, program management, and project management, with a focus on Microsoft and AWS tech
Highlights
2-9
Employees
New York, New York, Us
Services Provided
30% Custom Web Application Development
20% API Development & Integration
35% IT Staff Augmentation
15% Operational Process Consulting
AI Summary
“Seaside Software Solutions, based in New York, delivers expert IT consulting, custom software development, and strategic IT planning, specializing in Microsoft and AWS technologies across multiple industries.”
Ingenious Minds Lab
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
IngeniousMindsLab is your go-to destination for all mobile software development requirements. We handle every stage from initial concept to development, marketing, and ongoing support, offering outstanding results regardless of the project's complexity or variety. With over five years of extensive e
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
60% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% API Development & Integration
AI Summary
“Ingenious Minds Lab delivers comprehensive mobile and web development services with expertise in multiple technologies, serving global clients through strategic, innovative, and customized software solutions.”
TuneLab
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
TuneLAB stands at the forefront of the digital arena, recognized for making complexity manageable and crafting sophisticated web solutions that drive business growth. With over a decade of industry experience, we offer specialized knowledge across various fields, including hospitality, e-commerce, l
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Boryspil, Kyiv, Ua
Services Provided+1 Services
30% Custom Web Application Development
13% API Development & Integration
7% E-Commerce Development
35% AI Strategy & Roadmap Consulting
AI Summary
“TuneLAB delivers advanced, customized web solutions across diverse sectors, transforming complex digital challenges into strategic tools that drive growth and business success.”
DeviceBee Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
DeviceBee Technologies is a forward-thinking Mobile Apps Development agency that empowers startup founders and enterprises to enhance their web and mobile experiences. With locations across three continents, we have agile teams operating in Dubai, Lahore, San Francisco, and Kuwait. Our goal is to he
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Dubai, Dubayy, Ae
Services Provided
60% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% API Development & Integration
AI Summary
“DeviceBee Technologies is a global mobile app development agency delivering strategic, cost-effective solutions across diverse technologies, empowering startups and enterprises to enhance web and mobile experiences.”
Signum Edward Kuś
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a contemporary IT firm focused on creating sophisticated web, mobile, and desktop applications. Our goal is to implement cutting-edge technological solutions that effectively drive business expansion. We develop quick, secure, attractive, and responsive websites that are optimized for perform
Highlights
2-9
Employees
Katowice, Silesian, Pl
Services Provided
55% Custom Web Application Development
25% E-Commerce Development
20% API Development & Integration
AI Summary
“Signum Edward Kuś is a modern IT company specializing in innovative web, mobile, and desktop applications, delivering secure, efficient, and user-focused digital solutions to drive business growth.”
Sunscrapers
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Sunscrapers is a software development firm dedicated to assisting clients in growth and innovation through data-driven solutions. Established in 2010 and based in Warsaw, Poland, our goal is to merge the expertise of Polish engineers with a Western approach, creativity, and entrepreneurial spirit to
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
60% Custom Web Application Development
30% Backend Development
10% API Development & Integration
AI Summary
“Sunscrapers is a Warsaw-based software development firm specializing in data engineering, DevOps, and custom web applications, delivering innovative, data-driven solutions for diverse global clients.”
Pisol
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a web development and digital integration firm with more than 20 years of experience. Our team is made up of talented experts who excel at efficiently delivering tailored solutions for our clients. Our extensive expertise allows us to swiftly and flexibly tackle challenges with a personalized
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Buenos Aires, Ar
Services Provided+3 Services
23% Custom Web Application Development
18% API Development & Integration
5% E-Commerce Development
5% QA & Software Testing
AI Summary
“Pisol is a web development and digital integration firm with over 20 years' expertise, delivering tailored solutions in web, mobile apps, platforms, and API services through comprehensive, flexible processes.”
Conyro LTD
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Conyro is a custom software development company located in London, focused on creating high-performance B2B solutions and advanced AI systems. We excel in transforming complex business challenges into efficient, scalable digital solutions, including tools for regulatory compliance and emotionally in
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
35% Custom Web Application Development
15% Mobile App Development (iOS & Android)
25% API Development & Integration
5% E-Commerce Development
AI Summary
“Conyro LTD. is a London-based custom software developer specializing in advanced AI, regulatory compliance platforms, and enterprise asset management to deliver scalable, efficient B2B solutions.”

...

...

...

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

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.