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.

How this list is built

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

List of the Best API Development & Integration Agencies

  1. Inter Smart is a trusted web designing company in Kochi, Kerala, creating modern, user-friendly websites that help your business stand out and grow online.


    Highlights

    $5,000+

    Min Project Size

    $25-49/hr

    Avg Hourly Rate

    50-249

    Employees

    Kochi, Kerala, In

    Services Provided+16 Services
    6% Mobile App UI Design
    8% Web App UI Design
    4% Landing Page Design
    8% Other Design
    AI Summary

    “No AI summary available for this company yet.”

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    Vedapixel Tech Solutions Pvt Ltd is a technology firm that specializes in creating custom software, mobile applications, and web platforms for both startups and established businesses. We assist companies in turning their concepts into scalable digital products by integrating robust engineering prac


    Highlights

    $1,000+

    Min Project Size

    < $25/hr

    Avg Hourly Rate

    10-49

    Employees

    Bengaluru, Karnataka, In

    Services Provided
    50% Custom Web Application Development
    30% API Development & Integration
    20% E-Commerce Development
    AI Summary

    “Vedapixel Tech Solutions Pvt Ltd delivers custom software, mobile and web applications, SaaS, and CRM/ERP solutions, leveraging advanced technologies to support scalable, secure business growth.”

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    Seed Technologies is a custom software and web development company based in the U.S. that provides scalable solutions designed to help organizations enhance their operations, minimize inefficiencies, and promote long-term growth. Our internal development team focuses on creating secure, high-perform


    Highlights

    $5,000+

    Min Project Size

    $100-149/hr

    Avg Hourly Rate

    10-49

    Employees

    Tulsa, Oklahoma, Us

    Services Provided
    45% Custom Web Application Development
    20% Mobile App Development (iOS & Android)
    25% API Development & Integration
    10% E-Commerce Development
    AI Summary

    “Seed Technologies is a U.S.-based custom software and web development firm offering secure, scalable, and maintainable applications tailored to enhance business operations and support long-term growth.”

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    Esseal is a senior-led custom software engineering company based in England and Wales (Company No. 17026190), with locations in London and Lahore. We create, improve, and modernize software for startups, small and medium-sized enterprises (SMEs), and large organizations in the UK, US, and around the


    Highlights

    $1,000+

    Min Project Size

    $25-49/hr

    Avg Hourly Rate

    2-9

    Employees

    Lahore, Pk Punjab, Pk

    Services Provided
    45% Custom Web Application Development
    25% API Development & Integration
    20% E-Commerce Development
    10% Legacy System Modernization
    AI Summary

    “Esseal LTD. is a senior-led UK-based custom software engineering firm delivering timely, budget-conscious solutions for diverse sectors, emphasizing direct client-engineer collaboration and accountability.”

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    We are a vibrant small company based in the beautiful city of Kraków, Poland. Our story started when a significant need emerged in one of our founding partner's organizations for a strong web-based transportation software solution. Driven by this requirement, we set out to develop our own innovative


    Highlights

    < $25/hr

    Avg Hourly Rate

    2-9

    Employees

    Krakow, Lesser Poland, Pl

    Services Provided
    80% Custom Web Application Development
    20% API Development & Integration
    AI Summary

    “Onit Soft, a Kraków-based company, develops innovative web-based transportation software solutions, originating from a founding partner's identified industry need, showcasing adaptability and technical expertise.”

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    Since 2017, we have been dedicated to simplifying and optimizing your work. If you’re facing challenges with outdated systems or ineffective processes, our expertise can provide you with meaningful solutions. We specialize in streamlining operations through smooth ERP integrations and enhancing cust


    Highlights

    $10,000+

    Min Project Size

    $25-49/hr

    Avg Hourly Rate

    10-49

    Employees

    Marblehead, Massachusetts, Us

    Services Provided
    70% Custom Web Application Development
    15% Mobile App Development (iOS & Android)
    15% API Development & Integration
    AI Summary

    “Since 2017, IceFyre delivers tailored software solutions, specializing in ERP and CRM integrations, driven by comprehensive consultancy, rigorous training, and core values to optimize workflows and client success.”

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    FlowKit creates quick and scalable applications using Flutter/FlutterFlow in conjunction with Supabase (PostgreSQL). We offer tailored development services, template-driven accelerators, and various subscription options, covering everything from audits and debugging to complete production launches.


    Highlights

    $10,000+

    Min Project Size

    $50-99/hr

    Avg Hourly Rate

    10-49

    Employees

    Newark, Delaware, Us

    Services Provided
    80% Mobile App Development (iOS & Android)
    20% API Development & Integration
    AI Summary

    “FlowKit builds scalable Flutter and FlutterFlow applications integrated with Supabase, offering tailored development, templates, and subscriptions, operating from the US and EU with an expert team.”

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    Euro Format collaborates with businesses across Europe to develop customized software solutions that yield tangible results. We focus on the hospitality and service industries, where efficient operations and smooth customer interactions are vital for success. Our clients often face challenges such a


    Highlights

    $1,000+

    Min Project Size

    $25-49/hr

    Avg Hourly Rate

    2-9

    Employees

    Prague 4, Prague, Cz

    Services Provided
    80% Custom Web Application Development
    20% API Development & Integration
    AI Summary

    “Euro Format s.r.o. develops tailored software solutions for European hospitality and service industries, enhancing operations and customer interactions through reliable, scalable technologies and in-depth business understanding.”

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    Pandacuads is a comprehensive development agency specializing in WordPress and WooCommerce. We provide high-quality solutions, including custom plugin and extension development, theme creation, back-end and front-end development. Our services also encompass WordPress SaaS development, speed optimiza


    Highlights

    $1,000+

    Min Project Size

    < $25/hr

    Avg Hourly Rate

    2-9

    Employees

    Chapmansboro, Tennessee, Us

    Services Provided+1 Services
    23% API Development & Integration
    10% E-Commerce Development
    27% Pay Per Click
    7% Search Engine Optimization (SEO)
    AI Summary

    “Pandacuads agency delivers comprehensive WordPress and WooCommerce development, integrating expert API, digital marketing, and UI/UX design services to create optimized, secure, and high-performing web solutions.”

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    Savohi is a software development firm located in Chișinău, Moldova. We create and develop ready-to-use web applications, SaaS solutions, REST APIs, and automation tools for startups and expanding businesses around the globe. Our team is proficient in the full technology stack, utilizing Next.js and


    Highlights

    2-9

    Employees

    Services Provided
    45% Custom Web Application Development
    30% API Development & Integration
    10% E-Commerce Development
    15% Mobile App Development (iOS & Android)
    AI Summary

    “Savohi is a Moldovan software firm developing web applications, SaaS, APIs, and automation tools using modern technologies, providing end-to-end solutions with ongoing support globally.”

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