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

illuminise ltd
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Client Achievements (Millions in Online Sales) with illuminise: 1. Increased by 1,046% since 2015. 2. Grew by 429% from 2019. 3. Rose by 378% since 2019. About illuminise: illuminise Ltd is the top Adobe Certified Magento specialist in the UK and is recognized as the #1 Magento Development Agency
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Cambridge, England, Gb
Services Provided
50% E-Commerce Development
20% Backend Development
15% Frontend Development
15% API Development & Integration
AI Summary
“illuminise Ltd, UK's top Adobe Certified Magento specialist, delivers scalable eCommerce solutions with expert B2B/B2C focus, driving significant online sales growth and cost efficiency.”
S
Sparkup Technology Private Limited
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Sparkup Technology provides a comprehensive digital banking and identity verification platform that includes account management, payments, and secure APIs for automated workflows—all integrated into a single dashboard, along with custom software development services.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided
23% API Development & Integration
20% Custom Web Application Development
7% Mobile App Development (iOS & Android)
50% Cybersecurity Assessments & Hardening
AI Summary
“Sparkup Technology offers a unified digital banking and identity verification platform featuring account management, payments, and secure APIs, complemented by bespoke software development services.”
Amron Software Technologies Pvt Ltd
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Amron Software is a premier website design and web development company based in India, offering services in the US, including locations such as New York, California, Boston, and Texas. We are always prepared to create new web applications and develop content that aligns with our clients' business ne
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% E-Commerce Development
5% Mobile App Development (iOS & Android)
40% Custom Web Application Development
20% API Development & Integration
AI Summary
“Amron Software Technologies Pvt Ltd. is an India-based web design and development company offering tailored CMS, e-commerce, and digital marketing services to clients in the USA.”
GCT
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
GCT boasts a highly proficient team in JavaScript, with extensive experience in modern frameworks and libraries, including Vue.js 3, Nuxt.js, React.js, Next.js, TypeScript, Node.js, Express.js, Nest.js, PHP, Laravel, and others. Our primary strength lies in creating web applications and integrating
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Barcelona, Catalonia, Es
Services Provided+2 Services
30% Custom Web Application Development
20% API Development & Integration
20% Frontend Development
15% Backend Development
AI Summary
“GCT specializes in developing robust web and hybrid applications using modern JavaScript frameworks, backend technologies, and cloud DevOps, serving diverse industries including EdTech, healthcare, and fintech.”
Superscript Systems Ltd
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Superscript Systems, previously known as Exilion Technologies Inc., is a leading U.S.-based software engineering company that develops and manages production-ready software solutions for expanding businesses. Our expertise lies in custom software development, where aspects like reliability, security
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Langhorne, Pennsylvania, Us
Services Provided+4 Services
30% Custom Web Application Development
18% API Development & Integration
3% Blockchain & Web3 Development
15% AI Strategy & Roadmap Consulting
AI Summary
“Superscript Systems Ltd. is a U.S.-based software engineering firm specializing in custom AI-driven fintech solutions, emphasizing reliability, security, scalability, and long-term technical partnership for businesses.”
Provis Technologies Private Limited
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At Provis Technologies, we stand by the principle of "Creating software applications with Professional Vision." If you have a groundbreaking idea, we invite you to share it with us. Regardless of its complexity, we will provide a robust, scalable, and high-performance solution using the latest advan
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided
20% E-Commerce Development
25% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% API Development & Integration
AI Summary
“Provis Technologies Private Limited delivers scalable, high-performance software solutions, specializing in e-commerce, mobile, and web development using modern frameworks and agile methodologies since 2018.”
Embedcrest Technology Private Limited
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
EmbedCrest Technology Pvt Ltd specializes in providing high-performance embedded systems, firmware development, IoT solutions, edge AI/ML engineering, and industrial automation for companies worldwide. Since 2023, we have supported startups, OEMs, and enterprises in creating scalable, secure, and pr
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
1000-9999
Employees
Services Provided+2 Services
10% Custom Web Application Development
23% API Development & Integration
20% Product Design
14% Product UX Strategy
AI Summary
“Embedcrest Technology Pvt Ltd delivers expert embedded systems, firmware, IoT, edge AI/ML, and industrial automation solutions, enabling scalable, secure, and high-performance smart device development globally.”
F
Foscio Canada
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Foscio is a top digital product engineering and AI engineering company based in the renowned city of Bengaluru. The firm focuses on cutting-edge technologies including artificial intelligence (AI), machine learning (ML), internet of things (IoT), platform as a service (PaaS), software as a service (
Highlights
10-49
Employees
Vaughan, Ontario, Ca
Services Provided
25% API Development & Integration
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
AI Summary
“Foscio Canada is a Bengaluru-based digital product and AI engineering firm specializing in AI, ML, IoT, PaaS, SaaS, edge computing, and custom application development services.”
ownAI Solutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Agile and Dynamic. We are ownAI Solutions, specialists in creating SaaS applications, digital products, custom software, web applications, cloud-based solutions, and mobile apps integrated with AI technology. With over five years of experience in the industry, we have helped more than 30 businesses
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Rajkot, Gujarat, In
Services Provided+1 Services
15% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
5% Blockchain & Web3 Development
AI Summary
“ownAI Solutions specializes in tailored SaaS, AI-integrated software, and cloud applications, delivering quality digital products globally with a focus on business success and ethical practices.”
Datahayrick Search
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Datahayrick Search is an e-commerce search firm established in 2019 by specialists in search engine technology. The company specializes in consulting and developing product catalog search engines for online retailers, using key technologies such as Elasticsearch and Apache Solr. Datahayrick Search p
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Kharkiv, Kharkiv, Ua
Services Provided
30% Custom Web Application Development
50% Backend Development
20% API Development & Integration
AI Summary
“Datahayrick Search specializes in developing and consulting on advanced e-commerce search solutions using technologies like Elasticsearch and Apache Solr, serving major online retailers globally.”

...

...

...

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

S

F

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.