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

Iconwave Technologies Private Limited
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IconWave is a premier Service Delivery Platform Provider for Internet Service Providers (ISPs) and Telecom companies, offering a comprehensive billing and customer care solution. The company has broadened its focus to include various industries such as Education, Healthcare, Smart Cities, and Hospit
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Hyderabad, Telangana, In
Services Provided+1 Services
35% Custom Web Application Development
30% API Development & Integration
15% Mobile App Development (iOS & Android)
10% QA & Software Testing
AI Summary
“IconWave Technologies delivers versatile billing and customer care solutions for ISPs and telecom, expanding into sectors like education and healthcare, serving over 7 million subscribers globally.”
Very Good Ventures
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Very Good Ventures is a Flutter development firm with locations in New York City and Chicago. We are acknowledged as global leaders in Flutter, having created the first commercial app using Flutter outside of Google in 2017 (the official app for Hamilton the musical), and we have been dedicated to F
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
New York, New York, Us
Services Provided
50% Mobile App Development (iOS & Android)
30% Custom Web Application Development
20% API Development & Integration
AI Summary
“Very Good Ventures specializes in Flutter app development, offering comprehensive services including training, design, cloud solutions, and project management to support scalable, cross-platform applications.”
Thirdessential IT Solutions Pvt. Ltd.
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Third Essential IT Solution, founded in 2016, is committed to operating as an efficient software company, supported by a team of highly skilled professionals. Each team member brings extensive expertise in various areas, including innovation, design, application, and web development. Our primary cli
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided
30% E-Commerce Development
50% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Thirdessential IT Solutions Pvt. Ltd. specializes in delivering comprehensive IT services and solutions, focusing on innovative technology implementations and client-centric approaches to enhance business efficiency.”
Asabix
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Asabix is a comprehensive IT firm that specializes in the design and delivery of digital platforms for overseeing business processes, resources, and customer interactions. Founded in 2017, we have partnered with businesses where mistakes can cost thousands of dollars. This background has influenced
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
50% Custom Web Application Development
30% E-Commerce Development
20% API Development & Integration
AI Summary
“Asabix is an IT firm delivering secure, scalable digital platforms across diverse industries, emphasizing reliability and compliance, partnering with businesses throughout their product lifecycle from concept to support.”
Astonous
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Astonous is a committed consulting and application development firm specializing in Salesforce, offering cross-platform solutions and products on Salesforce AppExchange. Over the years, Astonous has successfully completed numerous Salesforce implementations. We excel at streamlining processes and en
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
25% CRM Consulting and SI
13% Cloud Consulting & SI
5% IT Staff Augmentation
7% Other IT Consulting and SI
AI Summary
“Astonous specializes in Salesforce consulting and development, delivering custom implementations, AppExchange solutions, and integration services to optimize business processes and enhance client ROI.”
TXTMSG.lk
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TXTMSG.lk offers quick, dependable, and cost-effective SMS gateway services for companies throughout Sri Lanka.
Highlights
2-9
Employees
Services Provided
34% SMS Marketing
33% API Development & Integration
33% Brand Identity Design
AI Summary
“TXTMSG.lk provides reliable, affordable SMS gateway solutions across Sri Lanka, enabling businesses to streamline communication efficiently and cost-effectively.”
Filari
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Filari is a comprehensive design and technology agency that develops web, mobile, and custom applications by merging strategy, design, and engineering to create scalable, high-performance digital solutions that address genuine business challenges. What distinguishes us is our experience and outcom
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
New Delhi, Delhi, In
Services Provided+1 Services
30% API Development & Integration
20% Custom Web Application Development
20% Product UX Strategy
15% UX Research & Usability Testing
AI Summary
“Filari is a design and technology agency delivering custom web and mobile applications with a focus on strategy, scalable architecture, EdTech specialization, and end-to-end partnership support.”
Nobug Tecnologia
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A comprehensive DevSecOps firm providing secure, scalable, and high-performance IT solutions. We focus on infrastructure, cloud services, cybersecurity, robotic process automation (RPA), and tailored software development, enabling businesses to innovate and expand with assurance.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
33% API Development & Integration
33% Robotic Process Automation (RPA)
24% DevOps Engineering
10% Cybersecurity Assessments & Hardening
AI Summary
“Nobug Tecnologia delivers secure, scalable IT solutions specializing in DevSecOps, cloud services, cybersecurity, RPA, and customized software development to drive business innovation and growth.”
SentryTrace
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SentryTrace is a tool for attack surface intelligence aimed at aiding security teams, developers, and founders in identifying exposed assets before they can be exploited by attackers. It performs ongoing scans to detect publicly available endpoints, misconfigurations, and hidden exposures throughout
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
33% Cloud Consulting & SI
24% Cloud Infrastructure Setup (AWS / GCP / Azure)
10% DevOps Engineering
33% API Development & Integration
AI Summary
“SentryTrace provides attack surface intelligence by continuously scanning infrastructures to identify publicly exposed assets and vulnerabilities, enabling security teams and developers to proactively prevent exploitation.”
Mathionix Technologies Pvt Ltd
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Mathionix Technologies is a seasoned IT Solutions Company that offers a wide range of technology services for startups, small and medium-sized enterprises, and large corporations. Our areas of expertise include mobile and web application development, cloud services, Salesforce solutions, artificial
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
10% E-Commerce Development
40% Mobile App Development (iOS & Android)
25% Custom Web Application Development
AI Summary
“Mathionix Technologies Pvt Ltd. delivers comprehensive IT solutions including mobile and web app development, cloud services, AI, Salesforce integration, and DevOps for diverse business needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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