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

East Whiz - Game Development Services
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We are a team of dedicated gamers who are passionate about game development. Our group consists of individuals with a deep love for gaming, and our skills span programming, art, and reverse engineering. We feature talented artists and coding experts experienced in various game genres, from Hyper Cas
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sahiwal, Pk Punjab, Pk
Services Provided
38% Mobile App Development (iOS & Android)
12% API Development & Integration
30% Product UX Strategy
20% UX Research & Usability Testing
AI Summary
“East Whiz is a skilled game development team specializing in diverse genres from Hyper Casual to eSports AA Multiplayer, offering innovative gaming and gamification solutions to varied clients.”
Unidatalab
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Unsure if investing in AI is a good idea? That's why we provide a personalized Proof of Concept for only $4–5K. Our team will develop a functioning AI solution specifically designed for your requirements, allowing you to witness actual results before making a larger investment. It's a low-risk oppor
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
50% Machine Learning Model Development
35% Custom Web Application Development
15% API Development & Integration
AI Summary
“Unidatalab delivers tailored AI and software solutions, specializing in machine learning and custom applications to enhance automation, efficiency, and innovation across diverse industries.”
B
B Startups
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B2B contract collaborations with companies in the US. EU-based software consultancy, prepared to assist your business with various projects. Services include Front End Development, Fullstack Development, API Integrations, and E-commerce integration, backed by 20 years of experience.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Alicante (Alacant), Es
Services Provided+1 Services
25% API Development & Integration
30% Custom Web Application Development
10% Legacy System Modernization
10% QA & Software Testing
AI Summary
“B Startups is an EU-based software consultancy specializing in B2B collaborations with US companies, offering Front End, Fullstack Development, API, and E-commerce integration services with 20 years experience.”
Pashyaa Technologies Pvt Ltd
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Welcome to 𝗣𝗮𝘀𝗵𝘆𝗮𝗮 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗣𝘃𝘁. 𝗟𝘁𝗱., your reliable partner in cutting-edge IT solutions. Located in the vibrant tech center of 𝗣𝘂𝗻𝗲, 𝗜𝗻𝗱𝗶𝗮, we are a respected IT services provider known for our exceptional software development and IT consulting services. 𝗪𝗵�
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Web App UI Design
AI Summary
“Pashyaa Technologies Pvt Ltd, Pune-based, delivers advanced, customized software development and IT consulting services, ensuring quality, affordability, and long-term client partnership for business growth.”
Teksolto Software Pvt. Ltd
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Teksolto Software offers comprehensive software development services across various technology stacks, such as Java, Node.js, Angular, and cloud platforms. We focus on creating scalable, secure, and tailored solutions, encompassing everything from backend systems and APIs to dynamic front-end applic
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided+4 Services
25% Custom Web Application Development
18% API Development & Integration
8% Mobile App Development (iOS & Android)
10% AI Strategy & Roadmap Consulting
AI Summary
“Teksolto Software Pvt. Ltd. delivers scalable, secure software solutions across multiple technologies, including Java and cloud platforms, enabling businesses with tailored backend, frontend, and mobile applications.”
QaiWare
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We are a custom payment software provider with over a decade of experience in the field, having delivered valuable services to more than 20 clients in the industry. Our company collaborates extensively with financial institutions and large enterprises on their core systems, acting as a business faci
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sofia, Sofia, Bg
Services Provided+4 Services
5% Mobile App Development (iOS & Android)
18% API Development & Integration
8% Legacy System Modernization
2% Blockchain & Web3 Development
AI Summary
“QaiWare specializes in custom payment software, collaborating with financial institutions to develop fintech solutions including payment flows, API design, secure tokenization, and integration of alternative payment methods.”
PLANEKS
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PLANEKS is an offshore company specializing in Python development and staff augmentation. We partner with startups and small to medium-sized enterprises (SMEs) to help them achieve their key objectives: creating digital products, assembling engineering teams, and bridging expertise or technology gap
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided+3 Services
25% Custom Web Application Development
13% API Development & Integration
5% E-Commerce Development
7% Mobile App Development (iOS & Android)
AI Summary
“PLANEKS specializes in Python development and staff augmentation, partnering with startups and SMEs to deliver innovative digital products and engineering solutions across diverse industries globally.”
inIT
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We are a welcoming group of October CMS specialists based in Poland, dedicated to offering affordable solutions with a focus on problem-solving. Whether you're part of a large agency or working independently, we deliver a discreet and secure development service to October users. Acting as an extensi
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Staszow, Swietokrzyskie, Pl
Services Provided
35% Custom Web Application Development
15% API Development & Integration
20% Mobile App UI Design
30% Web App UI Design
AI Summary
“inIT is a Poland-based team of October CMS experts delivering affordable, secure development services. They collaborate closely with agencies and freelancers to meet deadlines and exceed client expectations.”
Axioware
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Axioware was established with a straightforward yet bold goal: to provide cutting-edge AI technology to businesses of all scales. Recognizing the transformative capabilities of voice assistants and chatbots, we aimed to create solutions that could change the landscape of customer interaction. Today,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Karachi, Sindh, Pk
Services Provided+1 Services
13% Generative AI
7% AI Agent & Multi-Agent System Development
30% Custom AI Chatbot Development
20% API Development & Integration
AI Summary
“Axioware pioneers AI technologies, specializing in intelligent automation through voice assistants and chatbots, enhancing business growth, operational efficiency, and customer engagement globally.”
Sprint Studios
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Previously known as Code Power, Sprint Studios is an AI-driven software development studio that operates within Sprint Mode. It serves as the execution engine for Sprint Mode, providing AI-enhanced engineering, product development, and technical operations for rapidly growing companies. Our approach
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
San Francisco, California, Us
Services Provided+3 Services
10% Mobile App Development (iOS & Android)
10% API Development & Integration
10% Backend Development
3% E-Commerce Development
AI Summary
“Sprint Studios, formerly Code Power, is an AI-driven software development studio delivering AI-enhanced engineering, product development, and operations to accelerate growth for rapidly scaling companies.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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