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

ErgoServ
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Founded in 2013, ErgoServ is a leading software development team focused on creating customized solutions that meet specific business needs. Our main goal is to adopt a product-oriented approach to our projects while building long-lasting collaborative partnerships, typically lasting around seven ye
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Tallinn, Harju, Ee
Services Provided+2 Services
30% Software Development Services
30% Custom Web Application Development
15% API Development & Integration
10% Other IT Consulting and SI
AI Summary
“ErgoServ excels in tailored software solutions emphasizing Ruby backend development and API integration. Their expertise extends to custom web applications, thorough QA testing, and IT staff augmentation, reflecting their commitment to comprehensive software development services.”
kommit
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Since 2009, we have assisted companies in various sectors in overcoming IT challenges through effective software engineering. Our focus is on achieving results by providing solutions that meet your immediate needs while ensuring long-term stability. What sets us apart? High-performance teams— Easily
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Boynton Beach, Florida, Us
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% Blockchain & Web3 Development
50% IT Staff Augmentation
AI Summary
“Since 2009, kommit delivers effective software engineering solutions across sectors, emphasizing transparency, efficiency, and security with ISO 27001 certification and proven, results-driven teams.”
Estafet
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Estafet transforms your business concepts into reality with premium, user-focused software solutions, backed by extensive technical engineering knowledge and a cooperative strategy. Our quick response times and committed onsite teams based in the UK foster strong, effective partnerships customized t
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Richmond upon Thames, Greater London, Gb
Services Provided
20% API Development & Integration
25% Custom Web Application Development
5% QA & Software Testing
50% Machine Learning Model Development
AI Summary
“Estafet delivers user-focused, scalable software solutions through expert engineering and collaborative UK and nearshore teams, accelerating time to market with cost-efficient, high-quality development.”
Ascendance Solutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Since 2020, we have been offering advanced IT solutions to businesses. Focusing on web scraping, web development, AI integration, and various IT services, we help organizations succeed in the digital age. Our skilled team provides customized solutions designed to enhance efficiency, productivity, an
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Ankleshwar, Gujarat, In
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% E-Commerce Development
50% Custom AI Chatbot Development
AI Summary
“Ascendance Solutions offers advanced IT services since 2020, specializing in web scraping, development, and AI integration to enhance business efficiency and growth through tailored technology solutions.”
Airson Software
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Airson Software is an innovative technology company established in 2026. With a dedicated workforce of 10 to 49 experts, we focus on turning intricate ideas into top-notch digital solutions. Our guiding principle, "You Think It, We Bring It to Life," inspires us to connect abstract concepts with pra
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
35% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Airson Software, established in 2026, delivers innovative, tailored digital solutions including web, mobile, software engineering, and custom ERP development, helping businesses achieve strategic goals efficiently.”
84EM
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a WordPress development consultancy with 31 years of programming experience, 14 of which are dedicated to WordPress. Our Services: We create tailored WordPress solutions for digital agencies and businesses, tackling the technical obstacles that drive projects forward. Our Methodology: We blen
Highlights
2-9
Employees
Services Provided+2 Services
25% Custom Web Application Development
20% API Development & Integration
5% E-Commerce Development
25% AI Strategy & Roadmap Consulting
AI Summary
“84EM offers expert WordPress development and consultancy, combining 31 years of programming experience with AI-assisted methods to provide tailored, efficient, and secure digital solutions for agencies and businesses.”
TekInvent
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
TekInvent is a technology-focused company specializing in digital transformation by providing comprehensive IT services, business solutions, and digital products that help organizations adapt, improve, and expand. With a global delivery model and a diverse team of engineers, designers, strategists,
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Sheridan, Wyoming, Us
Services Provided
15% API Development & Integration
40% Custom Web Application Development
35% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“TekInvent delivers comprehensive IT services, including custom app development, cloud solutions, and AI-powered platforms, enabling organizations worldwide to drive digital transformation and business growth.”
Madgeek
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Madgeek is a software agency well-known for its specialization in creating customized enterprise applications and e-commerce solutions. With our deep knowledge and experience, we help businesses harness advanced technology to optimize their operations and improve the online shopping experience for c
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Bengaluru, Karnataka, In
Services Provided
45% Custom Web Application Development
20% API Development & Integration
35% E-Commerce Development
AI Summary
“Madgeek is a software agency specializing in customized enterprise applications and e-commerce solutions, enabling businesses to optimize operations and enhance online customer experiences through advanced technology.”
ImpiCode
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At ImpiCode, we focus on developing mobile, web, and IoT applications. Our team of 40 experts has successfully delivered over 80 projects for startups, corporations, NGOs, and other organizations. We emphasize providing efficient and customized software solutions. While we create projects from the g
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
35% Custom Web Application Development
40% Mobile App Development (iOS & Android)
15% API Development & Integration
10% Legacy System Modernization
AI Summary
“ImpiCode is a Warsaw-based software company specializing in mobile, web, and IoT development, delivering custom solutions and IT consulting globally across diverse industries with expert teams.”
Siam Computing
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a development agency specializing in three main areas: 1. Product Development 2. Mobile App Development 3. Custom Software Development. We have collaborated with both startups and large enterprises, successfully completing over 180 projects across various sectors, including Education, Busines
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Chennai, Tamil Nadu, In
Services Provided
40% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% API Development & Integration
10% Legacy System Modernization
AI Summary
“Siam Computing is a development agency delivering product, mobile app, and custom software solutions across diverse sectors, with 45 engineers and over 180 projects completed.”

...

...

...

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.