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.

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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

Astronefty
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Who are we? We are a digital and branding firm that values the impact of innovative strategies combined with exceptional design.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
25% Mobile App Development (iOS & Android)
5% E-Commerce Development
5% API Development & Integration
8% Custom Web Application Development
AI Summary
“Astronefty is a digital and branding firm specializing in innovative strategies and exceptional design, delivering impactful solutions across diverse digital and creative domains.”
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iCom shpk
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- Microfinance Core Banking System - Loan Initiation - Digital Loan eKYC / eSignature / Customer Relationship Management - Scoring and Decision Engine utilizing Machine Learning - Electronic Wallet and Associated Services - oDoo ERP/CRM - Oracle EBS - SAP ERP - Web Development using React/Next.js, D
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Tirane, Al
Services Provided+11 Services
5% API Development & Integration
8% Backend Development
6% Frontend Development
5% ERP & CRM Development
AI Summary
“iCom shpk specializes in integrating microfinance core banking with digital loan processing, machine learning scoring, ERP/CRM solutions, and web development using modern frameworks for comprehensive financial services.”
Ecesis
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ECESIS signifies the emergence of something fresh and vibrant in a landscape lacking vitality. We are a dedicated team, fueled by a deep commitment and a clear mission to generate sustainable value for our clients. Our journey started 14 years ago when we offered BPO services to the US real estate s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Thiruvananthapuram, Kerala, In
Services Provided+8 Services
2% API Development & Integration
9% Custom Web Application Development
8% Mobile App Development (iOS & Android)
1% E-Commerce Development
AI Summary
“Ecesis is a dedicated service provider with 14 years of experience, evolving from BPO in US real estate to diverse client-focused solutions, driving sustainable value and growth.”
Manrak Technologies
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Hello! We specialize in web and mobile design and development, primarily using technologies such as MEAN, MERN, PHP (including Core, Laravel, and CodeIgniter), Flutter, React Native, and more. Additionally, we operate as a digital marketing agency with experts in SEO, SMO, email marketing, Google Ad
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Noida, Uttar Pradesh, In
Services Provided+9 Services
10% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% API Development & Integration
5% E-Commerce Development
AI Summary
“Manrak Technologies offers comprehensive web and mobile design, development using MEAN, MERN, PHP, Flutter, React Native, alongside expert digital marketing services including SEO, PPC, and email marketing.”
Devstall
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Devstall is dedicated to assisting businesses in their growth through AI-enhanced web design and development. They provide white-label services for both B2C and B2B organizations, offering expertise in design, development, and marketing. Their mission is to enable agencies to scale effectively by mi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
6% Mobile App Development (iOS & Android)
13% Custom Web Application Development
6% API Development & Integration
8% Product UX Strategy
AI Summary
“Devstall offers AI-enhanced web design, development, and marketing services with scalable, white-label solutions for agencies, emphasizing cost efficiency, flexible staffing, and performance-driven results.”
Archtech Design
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At ArchTech Design, we go beyond being a web development firm; we are the creators of your online success. With more than 15 years of experience in the industry, we have refined our skills to provide outstanding web solutions that produce tangible results. Our dedication to innovation and excellence
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
13% Custom Web Application Development
5% API Development & Integration
8% E-Commerce Development
12% Product UX Strategy
AI Summary
“ArchTech Design leverages over 15 years of expertise to deliver innovative web solutions, driving business growth and online success through reliable, high-quality services.”
Mark Digital
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Are you searching for a dependable partner to enhance your team and elevate your business? Our team consists of highly skilled professionals with unparalleled experience in managing even the most intricate and demanding projects. We excel in various areas, including Business Analytics, UI/UX Design,
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+2 Services
15% Mobile App Development (iOS & Android)
15% Custom Web Application Development
3% API Development & Integration
33% Product UX Strategy
AI Summary
“Mark Digital delivers expert services in Business Analytics, UI/UX Design, Software and Cloud Development, offering tailored web and mobile solutions, project management, and consulting to realize complex projects efficiently.”
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Kotai Electronics Pvt. Ltd.
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Kotai Electronics is a leading provider of enterprise solutions, possessing exceptional expertise in advanced technologies that are shaping the modern world, including IoT, Blockchain, Enterprise Mobility, Progressive Web Apps, Search Engine Optimization, Augmented Reality, Cloud Applications, secur
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Kolkata, West Bengal, In
Services Provided+9 Services
10% Custom Web Application Development
5% E-Commerce Development
7% Mobile App Development (iOS & Android)
5% API Development & Integration
AI Summary
“Kotai Electronics Pvt. Ltd. delivers comprehensive technology solutions including custom software, blockchain, AI, digital marketing, and IT consulting, supporting enterprise innovation and operational efficiency in India.”
W3r.one
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W3r.one brings your digital ideas to life with our knowledge in web, mobile, and blockchain development. Learn how our creative methods can make your project a success.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+7 Services
5% API Development & Integration
10% Mobile App Development (iOS & Android)
11% Custom Web Application Development
7% Blockchain & Web3 Development
AI Summary
“W3r.one specializes in developing innovative digital solutions across web, mobile, and blockchain platforms, leveraging creative methods to ensure project success and client satisfaction.”
Compile Vision
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Compile Vision is a technology company centered on AI, dedicated to creating intelligent systems that assist businesses in automating their workflows, improving decision-making, and achieving efficient scalability. We develop advanced solutions leveraging Generative AI, Retrieval-Augmented Generatio
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
7% API Development & Integration
16% Custom Web Application Development
10% Mobile App Development (iOS & Android)
13% AI Agent & Multi-Agent System Development
AI Summary
“Compile Vision develops AI-driven intelligent systems and automation tools to streamline business workflows, enhance decision-making, and deliver scalable, data-driven solutions across various industries.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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