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

LL Technolab
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a prominent software development firm located in Ahmedabad, India, specializing in innovative custom software solutions tailored to your needs. For more than three years, we have been a reliable technology partner, providing customized software and network solutions for both startups and esta
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Mobile App Development (iOS & Android)
30% API Development & Integration
35% Custom Web Application Development
10% E-Commerce Development
AI Summary
“LL Technolab is a reputable Ahmedabad-based software development firm delivering customized, innovative software and network solutions to startups and established businesses, enhancing productivity and operational impact.”
Vibeconn Technologies Pvt. Ltd.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Vibeconn Technologies Pvt. Ltd., located in Faridabad, India, is a rapidly expanding IT services and consulting firm. We specialize in providing tailored software development, cloud services, artificial intelligence, video streaming, and digital transformation for enterprises. By prioritizing innova
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
25% Mobile App Development (iOS & Android)
30% API Development & Integration
10% E-Commerce Development
AI Summary
“Vibeconn Technologies Pvt. Ltd. is a fast-growing Indian IT firm offering customized software development, cloud computing, AI, video streaming, and digital transformation solutions to enterprises.”
Kinfirm
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At Kinfirm, we assist companies in developing sustainable digital systems. For nearly a decade, we've been utilizing Laravel daily to create self-service portals, business platforms, and custom web applications. Laravel is not just another tool for us; it is the primary framework we focus on, which
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Vilnius, Lt
Services Provided
70% Custom Web Application Development
10% E-Commerce Development
20% API Development & Integration
AI Summary
“Kinfirm specializes in developing sustainable, bespoke digital solutions using Laravel, delivering self-service portals, custom business applications, integrated systems, and AI features with over a decade of expertise.”
Aqsa Shahzad Official LLC
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At Aqsa Shahzad Official, our focus goes beyond just creating Shopify stores; we aim to establish enduring partnerships with the brands we work with. Our experienced team specializes in Shopify and Shopify Plus development, collaborating with DTC and B2B brands throughout the US, UK, and Ireland. We
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Sheridan, Wyoming, Us
Services Provided
70% E-Commerce Development
20% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Aqsa Shahzad Official LLC specializes in senior-led Shopify and Shopify Plus development, delivering transparent, tailored ecommerce solutions with direct client collaboration and proven long-term success.”
A
Aetherius Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Welcome to Aetherius Technologies, where we specialize in creating success through innovative web solutions. Since our inception, we have assisted our clients in discovering outstanding solutions for their businesses, helping to build memorable brands and digital products. Our expertise continues to
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% E-Commerce Development
AI Summary
“Aetherius Technologies delivers innovative web solutions and brand-building services, supporting businesses in developing impactful digital products and expanding capabilities to foster lasting success.”
Sheetcast
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We offer Custom Web Application Development Consulting and Excel-to-Web-App Consulting Services for businesses of all sizes. With our proprietary Sheetcast technology, we assist organizations in converting their spreadsheets into secure, scalable web applications that are customized to their workflo
Highlights
50-249
Employees
Edmonton, Alberta, Ca
Services Provided
70% Custom Web Application Development
10% Legacy System Modernization
20% API Development & Integration
AI Summary
“Sheetcast specializes in transforming spreadsheets into secure, scalable web applications through custom development, training, and ongoing support, enhancing business efficiency while reducing software costs.”
Fyrex Ltd.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Fyrex, Ltd. is a software and consulting firm that focuses on creating web-based applications with complex business logic. We have extensive experience in C#, ASP.NET, SQL, XML, HTML, JavaScript, WordPress, and Xamarin. Our team is adept at integrating external components and continuously enhances o
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
80% Custom Web Application Development
20% API Development & Integration
AI Summary
“Fyrex Ltd. is a software and consulting firm specializing in complex web-based applications, skilled in diverse technologies and Agile methodologies for innovative business solutions.”
Codeton Software sp. z o.o.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Codeton Software is a team of experts with significant experience in the field. Each day, we provide dependable software tailored to the specific needs and expectations of our clients. We have been part of the IT industry since 1998, coinciding with Google's inception, which is a noteworthy timeline
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Szczecin, West Pomeranian, Pl
Services Provided
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Codeton Software sp. z o.o. delivers tailored software development services with extensive expertise since 1998, focusing on analysis, design, deployment, and continual improvement across projects and culture.”
Bulk SMS Hub
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Bulk SMS Hub is an international communication platform that allows businesses to effectively engage with their customers through reliable, scalable, and powerful messaging solutions. We specialize in A2P bulk SMS services in various countries, assisting businesses in sending OTPs, alerts, notificat
Highlights
$1,000+
Min Project Size
10-49
Employees
Services Provided+2 Services
23% Email Marketing & Automation
25% SMS Marketing
2% Other Digital Marketing
5% Mobile App Development (iOS & Android)
AI Summary
“Bulk SMS Hub delivers global, reliable communication solutions including SMS, WhatsApp, email marketing, and omnichannel automation for businesses, supported by APIs, real-time analytics, and dedicated support.”
Magnetic
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Magnetic is a software development agency focused on delivering tailored and innovative software solutions for startups and corporations across various sectors. Our team consists of talented developers, designers, and project managers dedicated to transforming concepts into impactful digital product
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Prizren, Xk
Services Provided
50% Custom Web Application Development
25% API Development & Integration
25% Mobile App Development (iOS & Android)
AI Summary
“Magnetic is a software development agency delivering customized, innovative solutions for startups and corporations, focusing on quality, collaboration, and aligning technology with business goals.”

...

...

...

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.