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

TechCarrel LLP
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At TechCarrel, we turn digital dreams into reality. With ten years of experience in IT solutions, we are your reliable partner in navigating the constantly evolving technology environment. Our services provide smooth integration, outstanding efficiency, and long-term growth.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Gwalior, Madhya Pradesh, In
Services Provided
50% Custom Web Application Development
30% E-Commerce Development
20% API Development & Integration
AI Summary
“TechCarrel LLP delivers comprehensive IT solutions, leveraging a decade of experience to ensure seamless integration, enhanced efficiency, and sustained growth in evolving technology landscapes.”
NetriAI
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NetriAI has been driving business expansion for over seven years by providing tailored AI solutions. We create high-quality AI systems for both startups and large enterprises globally. Our expertise covers a range of areas including AI agents, RAG applications, voice AI, natural language processing,
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided+8 Services
9% AI Agent & Multi-Agent System Development
4% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
6% Machine Learning Model Development
AI Summary
“NetriAI delivers customized AI solutions across diverse domains, serving startups and Fortune 50 firms worldwide with expertise in AI agents, NLP, computer vision, and automation.”
IOL Inc.
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IOL Inc. is a software development company specializing in artificial intelligence, aimed at assisting businesses in becoming AI-driven organizations. With over five years of experience, our skilled team has been enabling companies to unlock their full potential through the implementation of tailore
Highlights
$10,000+
Min Project Size
10-49
Employees
Baguio City, Cordillera, Ph
Services Provided+2 Services
20% Custom Web Application Development
13% Mobile App Development (iOS & Android)
18% API Development & Integration
17% AI Agent & Multi-Agent System Development
AI Summary
“IOL Inc. specializes in AI-driven software solutions, offering custom development, web and mobile applications, automation, and system integration to empower businesses effectively.”
Octahedroid
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Octahedroid is not merely a web development agency; we represent a dynamic “mosaic” of thinkers, creators, and innovators committed to pushing boundaries. Our strength lies in transforming intricate digital challenges into smooth technological solutions. We excel in headless CMS architecture, Drupal
Highlights
10-49
Employees
Services Provided
23% API Development & Integration
25% Custom Web Application Development
2% Legacy System Modernization
50% Cloud Consulting & SI
AI Summary
“Octahedroid is a dynamic web development agency specializing in headless CMS, Drupal, and innovative applications, transforming complex digital challenges into effective technological solutions.”
NexonNet
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NexonNet is a comprehensive digital product agency that focuses on creating high-performance web applications, cross-platform mobile apps, and engaging 3D experiences. We collaborate with startups and expanding businesses to quickly transform ideas into products ready for launch. Our MVP Sprint mode
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
25% API Development & Integration
10% E-Commerce Development
AI Summary
“NexonNet is a digital product agency delivering high-performance web and mobile apps, 3D experiences, and scalable backend solutions with a focus on speed, quality, and clear collaboration.”
DYRE Marketing
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DYRE Marketing is a digital marketing firm dedicated to assisting home improvement and eCommerce companies in enhancing their online visibility. With more than 17 years of experience, we excel in custom web design, SEO, PPC (Google Ads), and Google Merchant integration to boost visibility, generate
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
25% API Development & Integration
25% E-Commerce Development
15% Search Engine Optimization (SEO)
13% Ecommerce Marketing
AI Summary
“DYRE Marketing specializes in digital marketing solutions for home improvement and eCommerce firms, offering web design, SEO, PPC, and data-driven strategies to enhance visibility and growth.”
ROBOTRONIX ENGINEERING TECH PVT. LTD.
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Robotronix is a company with 14 years of experience, supported by a team of specialists and over 6 years of practical knowledge in Machine Learning, Deep Learning, Data Science, and Big Data solutions. This extensive expertise allows us to create innovative, scalable, and data-driven solutions that
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided+3 Services
17% Generative AI
3% Workflow Automation (Zapier / Make / n8n)
14% BI & Big Data Consulting & SI
13% Mobile App Development (iOS & Android)
AI Summary
“Robotronix Engineering Tech Pvt. Ltd. leverages 14 years' expertise to deliver innovative AI, ML, Big Data, and analytics solutions, driving operational excellence and sustainable growth across industries.”
DeltaSpark
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We are a web development consultancy focused on helping small businesses and startups become digital leaders. Our skilled team of developers and consultants provides high-quality software solutions that blend extensive industry expertise with affordable strategies. We prioritize quality, guaranteein
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Tbilisi, Tbilisi, Ge
Services Provided
20% API Development & Integration
15% E-Commerce Development
45% Custom Web Application Development
20% Frontend Development
AI Summary
“DeltaSpark is a web development consultancy helping small businesses and startups build strong online presences through high-quality, affordable software solutions combining industry expertise and efficiency.”
Pixel Plugins
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We specialize in developing scalable and secure solutions, emphasizing advanced fintech integrations. Our goal is to provide cutting-edge and dependable technology that enables our clients to realize their business objectives and foster success. At Pixel Plugins, we merge technical proficiency with
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
20% Backend Development
5% Code Review & Technical Audits
50% DevOps Engineering
AI Summary
“Pixel Plugins develops scalable, secure technology solutions with advanced fintech integrations, delivering customized, reliable services that help clients achieve business goals and foster success.”
IQsoft LLC
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Established in Armenia in 2015, IQ Soft is a standalone software development firm focused on equipping iGaming and blockchain companies with innovative, customizable solutions. Our goal is to grant our partners autonomy through advanced automation and state-of-the-art technology, allowing them to gr
Highlights
$5,000+
Min Project Size
10-49
Employees
Yerevan, Am
Services Provided
33% Custom Web Application Development
17% API Development & Integration
50% Web App UI Design
AI Summary
“IQ Soft, founded in Armenia in 2015, delivers innovative software and B2B services to iGaming and blockchain sectors, enhancing autonomy, automation, and operational control.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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