If you’re running a business in today’s digital world, you know how critical it is to have your systems talking to each other smoothly. APIs-those nifty little bridges that let apps share data and functionality-are the backbone of modern software solutions. Whether you’re syncing customer data across platforms, automating workflows, or integrating AI tools, finding the right API integration company can make or break your project. The USA is home to some of the best in the business, and in this article, we’ll dive into what makes these companies stand out focusing instead on their expertise, approach, and why they’re trusted by startups and enterprises alike.

1. OSKI Solutions

We design and develop custom APIs to connect business systems, enabling seamless data flow and enhanced functionality across platforms, with a strong focus on meeting the needs of the U.S. market. Our work centers on creating APIs that integrate with cloud services, e-commerce platforms, and third-party tools, ensuring businesses in industries like logistics, retail, and education can operate efficiently. We tailor solutions to align with the specific operational demands of U.S.-based clients, helping them stay competitive in a dynamic digital landscape.

Our process starts with thorough consultation to understand client requirements, followed by development and ongoing support to maintain API performance. We prioritize secure, scalable integrations, leveraging technologies like REST and cloud-based architectures to help U.S. businesses adapt to evolving demands while keeping systems reliable and user-friendly. By addressing the unique challenges of the U.S. market, we ensure our solutions support innovation and growth for our clients.

Key Highlights:

• Expertise in cloud-based API integrations
• Support for industries like logistics and retail
• Focus on secure and scalable API solutions
• Comprehensive consultation for tailored integrations
• Ongoing maintenance for reliable performance

Services:

• Custom API development
• Third-party API integration
• Cloud API solutions
• API support and maintenance
• E-commerce and business system integrations

Contact Information:

• Website: oski.site
• Phone: +48571282759
• Email: contact@oski.site
• Address: Kaupmehe tn 7, 10114 Tallinn, Estonia
• LinkedIn: www.linkedin.com/company/oski-solutions

2. Apriorit

This company focuses on delivering API development and integration services with a strong emphasis on cybersecurity. With a long history in the software development space, it provides tailored solutions that help businesses connect systems, enhance functionality, and maintain secure operations. The approach centers on building APIs that are both robust and adaptable, ensuring compatibility with various platforms while prioritizing data protection. From custom API design to third-party integrations, the company covers the full spectrum of API needs, catering to industries like healthcare, finance, and technology.

The process begins with thorough requirement analysis and extends through design, development, testing, and ongoing maintenance. By incorporating security measures at every stage, the company ensures APIs are protected against vulnerabilities, with a focus on compliance and performance optimization. This methodical approach allows businesses to scale their operations efficiently while integrating modern technologies like cloud services and AI-driven tools.

Key Highlights:

• Emphasis on cybersecurity in all API-related services
• Comprehensive support from design to maintenance
• Expertise in integrating complex and legacy APIs
• Focus on scalability and compliance for diverse industries

Services:

• Custom API design and development
• Third-party API integration
• API performance and security testing
• API maintenance and optimization
• APIaaS development
• Data migration and synchronization

Contact Information:

• Website: www.apriorit.com
• Phone: +1 714-584-0295
• Email: info@apriorit.com
• Address: 20 Central Ave, Unit 505, Lynn, MA 01901, USA
• LinkedIn: www.linkedin.com/company/apriorit
• Facebook: www.facebook.com/apriorit
• Twitter: x.com/apriorit

3. Zazz

Zazz provides API development and integration services aimed at enhancing business operations through efficient system connectivity. The company focuses on creating APIs that support mobile, web, and cloud applications, helping businesses integrate with third-party services and optimize data-driven processes. With expertise in technologies like Java and Python, Zazz builds solutions that cater to diverse industries, from healthcare to enterprise-level digital transformation.

The services cover everything from API consulting to implementation and testing, with a strong emphasis on reducing operational complexity. By leveraging agile development practices, Zazz ensures that APIs are built to meet specific business goals, offering flexibility and scalability. The company also integrates security measures to protect data and ensure compliance, making its solutions practical for businesses looking to modernize their systems.

Key Highlights:

• Focus on mobile, web, and cloud API integrations
• Agile development for faster delivery
• Expertise in Java and Python for custom APIs
• Emphasis on secure and scalable solutions

Services:

• Custom API development
• API integration for mobile and web applications
• Cloud API development
• REST and Python API development
• API consulting and design
• API integration and testing

Contact Information:

• Website: www.zazz.io
• Address: 500 Mercer St, Seattle, WA 98109, USA
• LinkedIn: www.linkedin.com/company/zazz-io
• Facebook: www.facebook.com/Zazz.Official
• Twitter: x.com/Zazz_Official
• Instagram: www.instagram.com/zazz.io

4. Belitsoft

Belitsoft focuses on creating and integrating custom APIs to help businesses streamline their software systems. Its engineers work across various API types, such as REST and GraphQL, to connect internal and external platforms, ensuring smooth data sharing and automation. Belitsoft also emphasizes secure and efficient solutions for mobile and web applications, integrating features like payments and geolocation while prioritizing lightweight data formats like JSON.

In addition to development, Belitsoft offers consulting to guide clients through API-related decisions, from strategy and design to compliance with regulatory standards. Its work spans industries like finance and healthcare, where APIs are built to handle sensitive data securely and enable real-time functionality, such as connecting to large language models or syncing e-commerce platforms with inventory systems.

Key Highlights:

• Expertise in REST and GraphQL for high-speed, large-scale projects
• Focus on secure data handling with encryption and access controls
• Consulting services include business analysis and API strategy
• Integration with machine learning tools and language models
• Experience in financial and healthcare API compliance

Services:

• Custom API development and integration
• Mobile and web API development
• API consulting and strategy
• LLM API integration for AI capabilities
• E-commerce, CRM, and ERP API integration
• API testing and performance monitoring

Contact Information:

• Website: belitsoft.com
• Phone: +44 (20) 3318-18-53
• Email: info@belitsoft.com
• LinkedIn: www.linkedin.com/company/belitsoft-llc
• Facebook: www.facebook.com/Belitsoft
• Twitter: x.com/BelitsoftCom

5. Intersog

Intersog, based in Chicago, specializes in system integration and custom API development to connect diverse business systems. Its approach brings together data from multiple sources, like ERP, CRM, and SaaS applications, into centralized platforms for easier management. By focusing on seamless interoperability, Intersog helps businesses access critical data quickly across devices, streamlining workflows and reducing redundancies.

Its services extend to big data analytics and enterprise integration, enabling companies to modernize legacy systems without needing full replacements. Intersog’s recruitment model allows clients to select developers that align with their project needs, ensuring tailored solutions for industries like logistics and insurance, where it has helped clients manage complex data challenges.

Key Highlights:

• Centralized data integration from multiple sources
• Streamlined enterprise integration for ERP and CRM systems
• Flexible recruitment model for project-specific developer selection
• Emphasis on modernizing legacy systems
• Experience in logistics and insurance industries

Services:

• Data integration for structured and unstructured data
• Enterprise integration for ERP and CRM systems
• System integration for cross-platform compatibility
• Big data analytics integration
• API integration consulting

Contact Information:

• Website: intersog.com
• Phone: +18334683776
• Address: 220 N Green St, 2nd floor Chicago, IL 60607, USA
• LinkedIn: www.linkedin.com/company/intersog
• Facebook: www.facebook.com/intersognorthamerica
• Twitter: x.com/Intersog

6. ScienceSoft

ScienceSoft, with decades of experience in software engineering, develops and integrates custom APIs to enhance collaboration between applications. Its work focuses on enabling secure data exchange for businesses, connecting custom apps with third-party platforms to improve workflows. ScienceSoft prioritizes thorough testing and security measures, ensuring APIs meet industry standards for reliability and compliance across sectors like healthcare and retail.

Its process includes end-to-end API development, from design to ongoing management, with a focus on clear documentation and scalability. ScienceSoft has supported clients in building APIs for crypto payments and connected car apps, emphasizing practical solutions that integrate with existing systems while adapting to specific business needs.

Key Highlights:

• Comprehensive testing and quality assurance for APIs
• Security-focused API development with penetration testing
• Experience across healthcare, retail, and automotive industries
• End-to-end API development and management
• Well-documented APIs for ease of use

Services:

• Custom API development and integration
• API design and implementation
• API management and support
• API consulting for business alignment
• Secure API solutions for sensitive data

Contact Information:

• Website: www.scnsoft.com
• Phone: +1 214 306 6837
• Email: contact@scnsoft.com
• Address: 5900 S. Lake Forest Drive, Suite 300, McKinney, Dallas area, TX-75070
• LinkedIn: www.linkedin.com/company/sciencesoft
• Facebook: www.facebook.com/sciencesoft.solutions
• Twitter: x.com/ScienceSoft

7. Dotsquares

Dotsquares provides custom API development and integration services to connect business systems and enhance functionality. Its developers create secure, scalable APIs using protocols like REST, SOAP, and XML, enabling seamless data exchange across web, mobile, and cloud platforms. Dotsquares also integrates third-party APIs, such as payment gateways and social media platforms, to support features like transactions and user engagement.

In addition to development, Dotsquares offers consulting and maintenance services to ensure APIs align with business needs and operate reliably. Its work includes microservices consulting to modernize legacy systems and automated testing to optimize performance, catering to industries like e-commerce and logistics with tailored solutions.

Key Highlights:

• Focus on secure and scalable API solutions
• Integration with platforms like PayPal, Twilio, and FedEx
• Expertise in REST, SOAP, and XML protocols
• Microservices consulting for legacy system modernization
• Automated testing for performance and reliability

Services:

• Custom API development
• Third-party API integration
• API consulting and strategy
• API maintenance and support
• Cloud and microservices API solutions
• Automated API testing

Contact Information:

• Website: www.dotsquares.com
• Phone: (+44) 208 0901819
• Email: office@dotsquares.com
• Address: Unit 2, Hobbs Court, 2 Jacob St, London SE1 2BG, United Kingdom
• LinkedIn: www.linkedin.com/company/dotsquares
• Facebook: www.facebook.com/dotsquaresuk
• Twitter: x.com/dotsquares
• Instagram: www.instagram.com/dotsquaresltd

8. ManekTech

ManekTech develops custom APIs to help businesses integrate and expand their applications. Its services focus on creating APIs for mobile, web, and cloud platforms, enabling smooth data sharing and functionality across devices. ManekTech supports industries like healthcare and e-commerce by building tailored APIs that connect with existing systems or third-party services.

Beyond development, ManekTech emphasizes cost-effective solutions that allow businesses to add new features without overhauling infrastructure. Its approach includes thorough requirement analysis and agile development to ensure APIs meet specific business needs while maintaining compatibility with various platforms.

Key Highlights:

• Custom APIs for mobile, web, and cloud applications
• Support for industries like healthcare and e-commerce
• Focus on cost-effective integration solutions
• Agile development for tailored API design
• Emphasis on cross-platform compatibility

Services:

• Custom API development
• Third-party API integration
• API development for cloud services
• Web and mobile API solutions
• API consulting and requirement analysis

Contact Information:

• Website: www.manektech.com 
• Phone: +16235659895
• Email: usa@manektech.com
• Address: 4100 NW Loop 410, Suite 200, San Antonio, Texas, USA 78229
• LinkedIn: www.linkedin.com/company/manektech
• Facebook: www.facebook.com/ManekTech-191482567545069
• Twitter: x.com/manektech
• Instagram: www.instagram.com/manektech

9. CMARIX

CMARIX specializes in API integration and development to connect business systems and streamline operations. Its developers build custom APIs for web and mobile applications, ensuring seamless data flow and compatibility with platforms like payment gateways and social networks. CMARIX also provides solutions for industries such as finance and education, focusing on practical integrations that enhance system efficiency.

Its process involves agile methodologies and a client-focused approach to deliver APIs that align with specific business goals. CMARIX offers end-to-end services, from initial consultation to ongoing support, ensuring APIs remain functional and secure across diverse environments.

Key Highlights:

• Expertise in custom API development for multiple industries
• Integration with payment and social networking platforms
• Agile development for flexible project execution
• Client-focused approach for tailored solutions
• Comprehensive support from consultation to maintenance

Services:

• Custom API development
• Third-party API integration
• Payment and social networking API solutions
• End-to-end API integration services
• API consulting and support

Contact Information:

• Website: www.cmarix.com
• E-mail: biz@cmarix.com
• Phone: +1 415-704-4242
• Address: 32572 Miller Ct. Temecula, CA 92592
• Facebook: www.facebook.com/cmarixinfotech
• Twitter: x.com/cmarixinfotech
• LinkedIn: www.linkedin.com/company/cmarix
• Instagram: www.instagram.com/cmarixinfotech

10. Vision Infotech

Vision Infotech provides API integration and development services to connect business systems and improve efficiency. Its developers create custom APIs for web, mobile, and e-commerce platforms, enabling seamless data flow and functionality with systems like QuickBooks and CRM tools. The company focuses on aligning APIs with specific business needs, offering solutions for industries such as healthcare and fintech.

Beyond development, Vision Infotech supports clients with end-to-end services, including consulting, testing, and ongoing maintenance. Its approach emphasizes secure, scalable APIs and legacy system integration, ensuring businesses can modernize operations while maintaining compatibility with existing infrastructure.

Key Highlights:

• Expertise in connecting e-commerce and financial systems
• Support for legacy system integration
• Focus on secure and scalable API solutions
• Agile development with thorough testing
• Industry experience in healthcare and fintech

Services:

• Custom API development
• Third-party API integration
• Web and mobile API development
• API testing and validation
• API maintenance and support
• QuickBooks and REST API integration

Contact Information:

• Website: visioninfotech.net
• Phone: + 1(945)527-4841
• Email: sales@visioninfotech.net
• Address: 606 Seminole Trail, Murphy, TX 75094
• LinkedIn: www.linkedin.com/company/vision-infotech---india
• Facebook: www.facebook.com/p/Vision-InfoTech-100064033542849
• Twitter: x.com/vision395006
• Instagram: www.instagram.com/viztechsoftsolutions

11. Binate Digital

Binate Digital focuses on building custom API integrations to streamline business operations. Its developers create APIs that connect diverse software systems, enabling efficient data sharing and enhanced functionality. The company supports a range of integrations, including CRM and e-commerce platforms, to help businesses make data-driven decisions.

With a client-centric approach, Binate Digital tailors its API solutions to specific business needs, offering services from strategy to deployment. Its expertise spans industries like retail and finance, with a focus on secure, scalable APIs that integrate seamlessly with existing systems.

Key Highlights:

• Custom integrations for CRM and e-commerce systems
• Emphasis on secure data sharing
• Tailored API solutions for specific business goals
• Expertise in REST and third-party API integrations
• Support for data-driven decision-making

Services:

• Custom API integration
• Third-party API integration
• REST API development
• Web API development
• CRM API integration
• API analytics services

Contact Information:

• Website: binatedigital.com
• Phone: 8562436180
• Email: info@binatedigital.com
• Address: 600 Congress Ave, 14th Floor, Austin, TX 78701
• LinkedIn: www.linkedin.com/company/binatedigital
• Facebook: www.facebook.com/BinateDigitalOfficial
• Twitter: x.com/binate_digital
• Instagram: www.instagram.com/binatedigitalofficial

12. ClickySoft

ClickySoft develops and integrates custom APIs to connect business systems and improve operational efficiency. Its services include creating APIs for e-commerce, payment gateways, and social media platforms, ensuring seamless data exchange and functionality. The company serves industries like retail and healthcare, focusing on practical solutions that align with client needs.

The development process at ClickySoft involves agile methodologies, with stages from discovery to deployment, including rigorous testing to ensure reliability. It also provides ongoing support and maintenance to keep APIs secure and functional across various platforms.

Key Highlights:

• Integration with payment gateways and social media platforms
• Agile development with comprehensive testing
• Focus on secure and reliable API solutions
• Support for retail and healthcare industries
• End-to-end API development and management

Services:

• Custom API development
• Third-party API integration
• E-commerce and payment gateway API integration
• Social media API integration
• API testing automation
• API-managed services

Contact Information:

• Website: clickysoft.com
• Phone: +1 (832) 847-6000
• Email: info@clickysoft.com
• Address: 1423 Ashen Flock CT Katy, TX, 77494
• LinkedIn: www.linkedin.com/company/clicky-soft
• Facebook: www.facebook.com/ClickySoft
• Instagram: www.instagram.com/clickysoft

13. Vconnex Services

Vconnex Services specializes in custom API development and integration to enable seamless communication between software systems. Its developers create APIs using formats like JSON and REST, focusing on integrating third-party tools such as payment gateways and location services. The company supports businesses by enhancing system functionality and ensuring real-time data exchange across web and mobile applications.

In addition to development, Vconnex Services provides support and maintenance to keep APIs running smoothly. Its solutions cater to various industries, integrating analytics tools to aid decision-making and ensuring secure connections for systems like e-commerce platforms and business intelligence software.

Key Highlights:

• Expertise in JSON and REST API development
• Integration with tools like PayPal and Google Maps
• Focus on secure system connections
• Support for analytics integration
• Maintenance services for ongoing API performance

Services:

• Custom API development
• Third-party API integration
• Web and mobile API solutions
• API support and maintenance
• Analytics integration for business insights

Contact Information:

• Website: www.vconnexservices.com
• Phone: +1 561-632-4611
• Email: info@vconnexservices.com
• Address: 313 Datura St, Suite 200, West Palm Beach, Florida - 33401, USA
• LinkedIn: www.linkedin.com/company/vconnex-services-inc
• Facebook: www.facebook.com/vconnexservices
• Twitter: x.com/vconnexservices
• Instagram: www.instagram.com/vconnexservices

14. SKAD IT Solutions

SKAD IT Solutions offers API integration services to connect diverse business systems and improve operational efficiency. Its developers build custom APIs that integrate with platforms like CRM and ERP, enabling smooth data sharing and automation. The company serves industries such as healthcare and logistics, focusing on practical solutions that align with specific business needs.

The approach at SKAD IT Solutions includes robust security measures and compliance with industry standards to protect data during integrations. Its services also cover consulting and smart automation, helping businesses streamline workflows and adapt to changing requirements.

Key Highlights:

• Integration with CRM and ERP systems
• Focus on secure and compliant API solutions
• Support for healthcare and logistics industries
• Emphasis on automation for workflow efficiency
• Consulting for tailored integration strategies

Services:

• Custom API integration
• Third-party API integration
• API security and compliance
• Smart automation services
• System integration for ERP and CRM

Contact Information:

• Website: skadits.com
• Phone: +1 (801) 259-4800
• Email: admin@hexagonitsolutions.com
• Address:  827 Pioneer Rd #103, Draper, UT 84020, United States
• LinkedIn: www.linkedin.com/company/skad-it-solutions-llc
• Facebook: www.facebook.com/skaditsolutions
• Twitter: x.com/skaditsolutions
• Instagram: www.instagram.com/skad.it.solutions

15. MuleSoft

MuleSoft provides a platform for API development and integration, focusing on connecting enterprise systems and enabling AI-driven solutions. Its services include building APIs that support agent-to-agent communication and real-time data access across applications. MuleSoft’s solutions cater to complex business environments, integrating with platforms like Salesforce and other enterprise tools.

The company emphasizes governance and security, offering tools to manage and monitor APIs across various systems. Its approach includes pre-built connectors and intuitive design tools to simplify integration, supporting businesses in creating scalable and secure API ecosystems.

Key Highlights:

• Support for AI-driven API integrations
• Integration with enterprise platforms like Salesforce
• Focus on API governance and security
• Pre-built connectors for simplified development
• Solutions for multi-agent system collaboration

Services:

• Custom API development
• API integration for enterprise systems
• API governance and management
• Agent-to-agent API solutions
• Cloud-based API integration

Contact Information:

• Website: www.mulesoft.com
• Phone: 1-800-596-4880
• Address: Salesforce Tower, 415 Mission Street, 3rd Floor, San Francisco, CA 94105, United States
• LinkedIn: www.linkedin.com/company/mulesoft
• Facebook: www.facebook.com/MuleSoft
• Twitter: x.com/MuleSoft
• Instagram: www.instagram.com/mulesoft

16. Boomi

Boomi offers a platform for API management and integration, designed to connect applications and data across business systems. Its services enable seamless data flow between platforms, supporting automation and real-time insights. Boomi focuses on creating secure APIs that integrate with a wide range of enterprise applications, including cloud-based systems, to streamline operations.

The company provides tools for API governance, data synchronization, and AI agent orchestration, catering to industries needing robust connectivity solutions. Its approach includes pre-built connectors and intuitive interfaces to simplify integration processes, ensuring businesses can adapt to evolving needs without complex overhauls.

Key Highlights:

• Support for AI agent integration
• Extensive library of pre-built connectors
• Focus on secure API governance
• Solutions for data synchronization
• Integration with cloud and enterprise systems

Services:

• API management
• Application integration and automation
• Data management and synchronization
• AI agent orchestration
• API design and governance

Contact Information:

• Website: boomi.com
• Address: 1 W Elm St, Conshohocken, PA 19428, USA
• LinkedIn: www.linkedin.com/company/boomi-inc
• Facebook: www.facebook.com/Boomi.Official
• Instagram: www.instagram.com/_boomiofficial

17. PLANEKS

PLANEKS provides API development and integration services to enhance software functionality for businesses. Its developers create custom APIs and integrate third-party services, such as payment gateways and social networks, to improve data access and user experience. The company serves industries like healthcare and e-sports, focusing on tailored solutions that align with specific business goals.

In addition to development, PLANEKS offers API evaluation and support to ensure performance and reliability. Its approach emphasizes automation and scalability, helping businesses streamline operations and integrate large datasets efficiently through APIs.

Key Highlights:

• Expertise in payment and social network API integration
• Support for healthcare and e-sports industries
• Focus on automation and scalability
• API evaluation for performance and reliability
• Custom solutions for diverse business needs

Services:

• Custom API development
• Third-party API integration
• API evaluation services
• Payment gateway and marketplace API integration
• API support and maintenance

Contact Information:

• Website: www.planeks.net
• Phone: 917-963-8373
• Email: info@planeks.net
• LinkedIn: www.linkedin.com/company/planeks
• Facebook: www.facebook.com/planekscompany
• Twitter: x.com/planeks
• Instagram: www.instagram.com/planekscompany

18. Moon Technolabs

Moon Technolabs focuses on creating custom APIs to connect business systems and improve operational efficiency. Its developers build APIs using RESTful architectures and integrate third-party services like payment gateways and maps to enhance functionality. The company supports various industries, offering solutions that streamline processes and enable data-driven decisions.

The approach at Moon Technolabs includes comprehensive services from API design to maintenance, with an emphasis on performance optimization and security. Its developers also modernize legacy APIs and support IoT integrations, ensuring systems remain adaptable to new technologies and business needs.

Key Highlights:

• Expertise in RESTful API development
• Integration with payment gateways and maps
• Support for IoT and microservices architectures
• Focus on performance optimization and security
• Legacy API modernization services

Services:

• Custom API development
• Third-party API integration
• API design and implementation
• API testing automation
• API support and maintenance
• IoT and microservices integration

Contact Information:

• Website: www.moontechnolabs.com
• Phone: +1 (620) 330-9814
• Email: sales@moontechnolabs.com
• Address: 500 N Michigan Avenue, #600, Chicago IL 60611
• LinkedIn: www.linkedin.com/company/moon-technolabs-pvt-ltd
• Facebook: www.facebook.com/moontechnolabs
• Twitter: x.com/moontechnolabs

Conclusion

As businesses increasingly rely on interconnected systems to stay competitive, API integration has become a cornerstone for seamless operations and innovation. The companies highlighted in this article offer a range of solutions, from custom API development to third-party integrations, catering to diverse industries like healthcare, retail, and logistics. Each brings a unique approach to solving connectivity challenges, ensuring data flows smoothly and systems work together without hiccups.

Looking ahead to 2025, the demand for secure, scalable, and efficient API solutions will only grow. Whether a business needs to modernize legacy systems or integrate cutting-edge technologies like AI, these providers offer practical tools and expertise to make it happen. By focusing on tailored integrations and reliable support, they help businesses navigate the complexities of digital transformation with confidence.