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

illustraV
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Companies spend more than 1000 hours each year on repetitive yet essential tasks. Have you considered that these tasks might be automated? That's where we can assist... We begin by linking your website to your internal systems and then proceed to automate all tasks that don't need human intervention
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
60% API Development & Integration
30% Custom Web Application Development
10% Mobile App Development (iOS & Android)
AI Summary
“illustraV automates repetitive business tasks by integrating websites with internal systems, enhancing employee productivity through innovative, reliable solutions that improve operational efficiency.”
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No Code Octopus
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Welcome to No Code Octopus, where creativity meets effectiveness in the field of no-code automation and workflow creation. As an innovative leader, we take pride in offering state-of-the-art solutions that help businesses navigate the digital environment with ease. At No Code Octopus, we recognize t
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
60% API Development & Integration
40% Custom Web Application Development
AI Summary
“No Code Octopus specializes in no-code automation and workflow solutions, enabling businesses to enhance productivity and streamline operations through innovative, user-friendly technology.”
DAWAP
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Dawap is a French digital agency focusing on API integrations, marketplace solutions, and bespoke web development. We assist ambitious businesses in linking their systems (including ERP, CRM, logistics, payments, and analytics) and enhancing their e-commerce operations with robust, forward-looking a
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
60% API Development & Integration
30% Custom Web Application Development
10% E-Commerce Development
AI Summary
“Dawap is a French digital agency specializing in API integrations, custom web development, and marketplace solutions, delivering agile, scalable, and tailored digital growth platforms for diverse industries.”
Chain49
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We offer a consolidated API that highlights the commonalities among various cryptocurrencies. Although Bitcoin and Ethereum differ significantly, they share foundational blockchain principles. Rather than having to develop a separate backend API for each cryptocurrency, you can create one unified AP
Highlights
2-9
Employees
Services Provided
25% Backend Development
60% API Development & Integration
15% Blockchain & Web3 Development
AI Summary
“Chain49 delivers unified blockchain APIs and backend solutions supporting over 50 cryptocurrencies, enabling seamless integration through consolidated, reliable software development and managed full nodes.”
Rootbine
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We're not simply a digital agency; we're seasoned freelancers! Partnering directly with freelancers allows you to benefit from significantly reduced rates. In contrast to traditional agencies that face high overhead costs like office rentals, administrative staff, and general operational expenditure
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Krakow, Lesser Poland, Pl
Services Provided
50% API Development & Integration
20% E-Commerce Development
30% Mobile App Development (iOS & Android)
AI Summary
“Rootbine connects clients directly with experienced freelancers, delivering cost-effective web development and digital solutions by minimizing overhead, fostering growth, and adapting to evolving digital challenges.”
Jevil Codes
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We assist companies in boosting conversions and minimizing support workloads through WhatsApp automation. Avoid losing potential clients due to delayed responses and manual tasks.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% Custom Web Application Development
60% API Development & Integration
20% E-Commerce Development
AI Summary
“Jevil Codes specializes in WhatsApp automation solutions that enhance customer engagement by increasing conversions and reducing support workloads through efficient response management.”
Natural Tech House
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Returning to Reality: We develop digital products with an emphasis on human connections and empathy. Our proven methodology and diverse industry experience ensure exceptional solutions. We take pride in emphasizing collaboration with clients, tailoring our approaches to their needs, and offering sec
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Buenos Aires, Ar
Services Provided
50% API Development & Integration
35% Product Design
15% UX Research & Usability Testing
AI Summary
“Natural Tech House develops empathetic digital solutions emphasizing human connections, client collaboration, and tailored methodologies to deliver secure, impactful products that enhance user experiences across industries.”
Conveyance Solutions
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Conveyance Solutions is a business technology partner focused on Epicor ERP solutions for industrial distributors. Our team possesses extensive knowledge in the implementation, upgrades, and optimization of Epicor Prophet 21 (P21) ERP systems. We support clients throughout the entire ERP journey—sta
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Irvine, California, Us
Services Provided
50% API Development & Integration
50% ERP Consulting and SI
AI Summary
“Conveyance Solutions partners with industrial distributors to implement, upgrade, and optimize Epicor Prophet 21 ERP systems, delivering tailored integrations, migrations, and AI-driven enhancements for digital transformation.”
Optimworks Technologies Private Limited
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Optimworks Technologies is a committed and prominent software testing company focused on assisting organizations in enhancing the quality of their software delivered around the globe. With extensive experience supporting clients worldwide in their pursuit of top-notch software with superior quality
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Hyderabad, Telangana, In
Services Provided
50% API Development & Integration
50% IT Staff Augmentation
AI Summary
“Optimworks Technologies specializes in comprehensive software testing services, enhancing global clients' software quality through innovative, optimized, and reliable testing across various platforms and applications.”
D10x
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At D10X, we focus on smoothly integrating a variety of technologies, fields, and programming languages to create unique and highly effective solutions. Our strategy emphasizes choosing technologies that are specifically suited to meet particular problem needs, rather than trying to make a problem co
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided
50% API Development & Integration
40% AI Strategy & Roadmap Consulting
10% IT Staff Augmentation
AI Summary
“D10X specializes in integrating diverse technologies and programming languages to develop innovative, tailored solutions by selecting tools specifically suited to address unique challenges effectively.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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