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

ZplusRanking
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ZplusRanking - SEO for Websites and Tailored Applications
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+15 Services
4% Frontend Development
4% API Development & Integration
8% Custom Web Application Development
3% QA & Software Testing
AI Summary
“ZplusRanking specializes in SEO services for websites and custom applications, enhancing online presence and search engine performance to support diverse digital marketing needs.”
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Presync
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Presync Technology is a prominent software firm located in Bangladesh, dedicated to providing innovative, scalable, and high-performance digital solutions. Our team, composed of enthusiastic engineers, designers, and AI/ML experts, offers comprehensive technology services tailored to the dynamic req
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
10% Backend Development
10% Frontend Development
AI Summary
“Presync Technology is a Bangladeshi software firm delivering custom, scalable web and mobile applications, with expertise in AI/ML solutions to support startups and enterprises alike.”
NonchTech
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About NonchTech: NonchTech assists businesses in achieving growth through comprehensive digital solutions that connect strategy, branding, and implementation. We merge in-depth business knowledge with contemporary digital methods to aid organizations at every phase of their development — encompassin
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+9 Services
9% E-Commerce Development
4% API Development & Integration
4% Custom Web Application Development
3% Mobile App Development (iOS & Android)
AI Summary
“NonchTech delivers integrated digital solutions encompassing strategy, branding, marketing, and e-commerce to empower businesses in enhancing growth, visibility, and competitive positioning across digital platforms.”
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Degen Lab
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DegenLab is a group of experienced blockchain engineers and product developers focused on creating innovative open-source infrastructure within the Bitcoin, Ethereum, and Solana ecosystems. With more than a decade of expertise in software and Web3 development, we excel in delivering secure, scalable
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
10% Custom Web Application Development
22% Blockchain & Web3 Development
2% API Development & Integration
33% DevOps Engineering
AI Summary
“DegenLab specializes in open-source blockchain infrastructure and cross-chain solutions across Bitcoin, Ethereum, and Solana, leveraging over a decade of experience to deliver secure, scalable decentralized applications.”
LEVO Ventures
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The Ultimate Hub for Smart Apparel, Wearable Technology, and Human Enhancement Solutions. Welcome to Levo Ventures—your premier platform for businesses and investors at every level in the realms of smart clothing, wearable technology, and technologies that augment human abilities. Access unparallele
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
50-249
Employees
Services Provided+18 Services
7% Mobile App Development (iOS & Android)
6% Custom Web Application Development
5% API Development & Integration
2% Legacy System Modernization
AI Summary
“Levo Ventures is a leading platform connecting businesses and investors in smart apparel, wearable technology, and human enhancement, offering funding, venture capital, and specialized industry resources.”
Forte Innovation Consulting
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We are a digital transformation agency staffed by a diverse consulting and technical team with over 15 years of experience in creating and implementing technology solutions for various sectors, including both public and private entities. Our primary aim is to promote the digital progress of society
Highlights
10-49
Employees
Services Provided+18 Services
5% Custom Web Application Development
2% Frontend Development
3% Backend Development
4% Legacy System Modernization
AI Summary
“Forte Innovation Consulting is a digital transformation agency offering comprehensive technology solutions—including consulting, software development, cloud services, data science, and managed services—to advance digital progress across sectors.”
BitProwler
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Bitprowler is a comprehensive agency focused on creating unique digital environments that give you a competitive advantage.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided+16 Services
6% Custom Web Application Development
4% API Development & Integration
4% Frontend Development
3% QA & Software Testing
AI Summary
“BitProwler is a full-service agency specializing in developing innovative digital environments that enhance clients' competitive edge across various industries.”
DataCaliper LLC
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Focused on outcomes and results-oriented, the engineers and innovators at DataCaliper provide a diverse range of services across various technology and software domains. Whether engaging with our seasoned consultants domestically or leveraging our strong engineering teams from our development center
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+20 Services
5% ERP & CRM Development
5% SaaS Product Development
4% Legacy System Modernization
5% Custom Web Application Development
AI Summary
“DataCaliper LLC specializes in comprehensive software and technology services, including custom development, SaaS, ERP, mobile apps, data science, and cloud solutions, ensuring quality and efficiency.”
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Synchroworks
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We offer a wide range of IT services and solutions, which include the following:
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Vaughan, Ontario, Ca
Services Provided+26 Services
3% ECM Consulting and SI
3% Unified Communications Consulting & SI
4% Cloud Consulting & SI
3% Other IT Consulting and SI
AI Summary
“Synchroworks provides comprehensive IT services and solutions, delivering a broad spectrum of technology support and innovations to meet diverse business needs effectively and professionally.”
Barmagie
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A software development agency that offers a variety of services, including web development, is striving to become the top choice for web developers in Lebanon.
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
3% API Development & Integration
17% Custom Web Application Development
7% E-Commerce Development
7% Mobile App Development (iOS & Android)
AI Summary
“Barmagie is a Lebanese software development agency specializing in web development, aiming to be the leading provider of comprehensive digital solutions in the region.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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