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

Fixdemonium
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Fixdemonium provides the most cost-effective WordPress assistance, with rates starting at only $25 per hour for each fix. We address problems, enhance performance, and ensure your site remains secure.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Beograd, Belgrade, Rs
Services Provided+1 Services
25% CRM Consulting and SI
15% Cybersecurity Assessments & Hardening
10% Managed IT Services
25% API Development & Integration
AI Summary
“Fixdemonium offers affordable, professional WordPress support, addressing technical issues, improving website performance, and maintaining robust security with rates starting at $25 per hour.”
Fortrou Development
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At Fortrou Development, we build more than just websites and apps; we provide impactful digital solutions designed to enhance your business growth. With a strong focus on innovation and a dedication to quality, we transform concepts into customized web and mobile experiences. Why Partner with Us? Di
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Vienna, Vienna, At
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Fortrou Development specializes in creating customized web and mobile digital solutions, emphasizing innovation and quality to drive business growth and enhance online presence effectively.”
10xtech.co.in
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10xtech, located in Mumbai, is an innovative digital transformation company that has been successfully providing a wide range of IT solutions and services to businesses since 2015. Our steadfast dedication at 10xtech is to harness technology to support our clients as reliable partners in their digit
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Mumbai, Maharashtra, In
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“10xtech, based in Mumbai since 2015, offers innovative IT solutions including web and mobile app development, payment integration, and platform support to drive digital transformation.”
MOBILE EL SALVADOR S.A. DE C.V.
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We have concentrated on creating comprehensive solutions for our clients, successfully launching 46 mobile applications across various industries and utilizing multiple technologies and environments. Our work ranges from turn-key solutions that include both backend and frontend development for start
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Santa Tecla, Sv
Services Provided+1 Services
15% API Development & Integration
40% Mobile App Development (iOS & Android)
15% Custom Web Application Development
15% Frontend Development
AI Summary
“MOBILE EL SALVADOR S.A. DE C.V. specializes in comprehensive mobile solutions, delivering turnkey and modular applications across industries, leveraging diverse technologies to meet clients' varied needs.”
Onivor
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Onivor is a technical partner in Indonesia for founders and businesses looking to develop digital products. Their services include idea validation (Rp 3-5 million, 2 weeks), MVP development (Rp 25-50 million, 4-6 weeks), and Agent-Ready API Enablement for AI automation integration (starting at Rp 18
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Jakarta, Jawa, Id
Services Provided
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
50% AI Agent & Multi-Agent System Development
AI Summary
“Onivor is an Indonesian technical partner for digital products, offering fixed-price idea validation, MVP development, and AI integration with founder-led expertise and full client code ownership.”
MaxBrain Technologies
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MaxBrain Technologies is a dynamic and dependable development team focused on engineering that creates modern web and mobile applications as well as AI solutions utilizing React, TypeScript, Node.js, and cutting-edge cloud technologies. Our expertise lies in producing clean code, ensuring rapid deli
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% E-Commerce Development
20% API Development & Integration
AI Summary
“MaxBrain Technologies delivers end-to-end web, mobile, AI, and IoT solutions, leveraging modern technologies to create scalable, efficient applications with rapid development and long-term support.”
Nevrio Technology Services Pvt Ltd
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Nevrio Technologies is a top-tier software development firm that specializes in services such as app development, web development, AR/VR, and game development. We deliver top-quality services to businesses and brands around the world.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Zirakpur, Punjab, In
Services Provided+2 Services
20% API Development & Integration
30% Mobile App Development (iOS & Android)
13% Cloud Consulting & SI
13% Other IT Consulting and SI
AI Summary
“Nevrio Technology Services Pvt Ltd is a leading software development company offering app, web, AR/VR, and game development services to global businesses and brands.”
Cuatro Punto Cero
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We assist businesses in boosting their productivity, reducing expenses, and removing repetitive tasks through customized software solutions designed specifically for them.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Mexicali, Mx
Services Provided
30% Mobile App Development (iOS & Android)
40% Custom Web Application Development
10% E-Commerce Development
20% API Development & Integration
AI Summary
“Cuatro Punto Cero delivers tailored software solutions to enhance business productivity, cut costs, and eliminate repetitive tasks, supporting efficient and customized operational improvements.”
Momentum Squads
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Momentum Squads is a software development firm specializing in websites, chatbots, and artificial intelligence. Our emphasis on long-term partnerships, support for startups, quick turnarounds, and proficiency in segmentation, AI assistant development, and generative models sets us apart as trustwort
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
20% Generative AI
23% Custom AI Chatbot Development
7% AI Model Fine-Tuning & Training
30% Custom Web Application Development
AI Summary
“Momentum Squads is a software development firm specializing in websites, chatbots, and AI solutions, focused on startups, long-term partnerships, and delivering quality, value-driven technology services.”
Adaptable
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Adaptable is your reliable partner for creating modern headless websites and digital products. We assist global organizations in moving away from outdated platforms, providing elegantly designed, results-oriented digital experiences.
Highlights
$25,000+
Min Project Size
10-49
Employees
Birmingham, England, Gb
Services Provided+2 Services
20% Custom Web Application Development
14% API Development & Integration
10% UX Audit & Heuristic Evaluation
13% Wireframing & Prototyping
AI Summary
“Adaptable partners with global organizations to develop modern, headless websites and digital products, replacing outdated platforms with elegantly designed, impactful user experiences.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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