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17 Best Third Party API Integration Companies (2026)

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    Targets we’ve achieved:
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    AI Summary
    Sergii Steshenko
    CEO & Co-Founder @ Lengreo

      Third party APIs can save months of development, but only when the integration is built properly. A rushed connection may work at launch and then become a constant source of failed requests, missing data, and security concerns.

      This article brings together third party API integration companies that help businesses connect payment platforms, CRMs, cloud tools, analytics systems, and other external services. The companies differ in technical focus and delivery model, giving businesses several options depending on the complexity of their systems and the outcomes they need.

      Lengreo

      1. Lengreo

      At Lengreo, we handle third party API integration as part of broader web and software development work. We connect business systems such as CRMs, marketing automation tools, analytics platforms, lead generation software, and internal operational services. The aim is usually straightforward: remove repeated manual work and make sure information moves between teams without someone copying it from one platform to another.

      Our background in marketing and business development also shapes how we approach these integrations. A CRM connection, for example, is not treated as an isolated technical task if it affects lead tracking, reporting, or campaign follow-up. We look at how the tools are used by sales and marketing teams, then build and test the connection around the actual workflow.

      Key Highlights:

      • Third party integrations for marketing and operational systems
      • Connections between CRMs, analytics tools, and automation platforms
      • Workflow planning based on how sales and marketing teams use the data
      • Technical support alongside web and custom software development

      Services:

      • Third party API integration
      • CRM and marketing platform integration
      • Analytics and reporting system connections
      • Marketing automation integration
      • Custom web development
      • Quality assurance and ongoing support

      Contact Information:

      • clutch logo
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      CodeStore Technologies

      2. CodeStore Technologies

      CodeStore Technologies provides third-party API integration for websites, web applications, mobile products, and internal business systems. They connect external services with existing software so data can move between platforms without repeated manual input. Their team also adjusts older workflows when the current setup is not ready to support a new API connection.

      Before development begins, they review the technical requirements and check whether the requested integration fits the existing infrastructure. CodeStore Technologies can then build custom APIs, configure third-party connections, test data exchange, and provide support when systems are changed or upgraded later.

       

      Key Highlights:

      • Custom APIs built around existing software
      • Support for older platforms and changing technical requirements
      • Testing and maintenance after implementation
      • Direct communication with the development team

       

      Services:

      • Third-party API integration
      • Custom API development
      • Web application integration
      • Mobile application integration
      • SaaS platform integration
      • API testing and support

       

      Contact Information:

      • Website: www.codestoresolutions.com
      • E-mail: [email protected]
      • Facebook: www.facebook.com/codestoresolutions
      • Twitter: x.com/codestoresol
      • LinkedIn: www.linkedin.com/company/codestoresolutions
      • Instagram: www.instagram.com/codestoresol
      • Address: C – 15 First Floor, C Block, Sector 65, Noida, Uttar Pradesh 201301 
      • Phone: +91 95997 20600 

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        Neontri

        3. Neontri

        Neontri handles third-party integrations for companies that need separate applications to exchange data and work as one system. They work with APIs, webhooks, custom connectors, and API gateways, covering connections with CRM systems, payment services, e-commerce platforms, and other business software.

        Security and long-term maintenance are built into the integration process rather than left until the end. Neontri also connects legacy software with newer applications, which can be useful when replacing the whole system would create more disruption than the integration itself. Their team reviews access rules, data flows, scalability, and possible failure points before putting the connection into regular use.

         

        Key Highlights:

        • Experience with enterprise and financial systems
        • API gateway setup and management
        • Support for legacy software integration
        • Focus on secure and stable data exchange

         

        Services:

        • API integration
        • Webhook implementation
        • Third-party application integration
        • Custom connector development
        • API gateway integration
        • Legacy system integration
        • Ongoing integration maintenance

         

        Contact Information:

        • Website: neontri.com
        • E-mail: [email protected]
        • LinkedIn: www.linkedin.com/company/neontri
        • Address: Puławska 2, 02-566 Warszawa
        • Phone: +48 730 007 717

         

        Oski Solutions

        4. Oski Solutions

        Oski Solutions approaches third-party API integration through backend development. They build the server-side logic that allows external platforms to communicate with web applications, business systems, and data services. Depending on the existing stack, they can work with C#, .NET Core, Node.js, Python, PHP, or Ruby.

        Alongside the connection itself, Oski Solutions works on database handling, authentication, error processing, and system performance. They can also develop a custom API when an off-the-shelf integration does not provide enough control over the data or workflow.

         

        Key Highlights:

        • Backend-focused integration work
        • Support for several programming languages and frameworks
        • Custom API and microservice development
        • Continued support after deployment
        • Integration with complex data workflows

         

        Services:

        • Third-party API integration
        • Custom API development
        • Backend development
        • Database integration
        • Microservice development

         

        Contact Information:

        • Website: oski.site
        • E-mail: [email protected]
        • LinkedIn: www.linkedin.com/company/oski-solutions
        • Address: Kaupmehe tn 7-120, Tallinn, 10114, Estonia 
        • Phone: +48571282759
        Raagz IT

        5. Raagz IT

        Raagz IT connects business software with external platforms through custom third-party API integrations. They work with payment gateways, social networks, e-commerce tools, mapping services, CRMs, and enterprise systems. Their integrations can support data exchange in both directions, including real-time updates when information such as stock levels, payments, or account activity changes.

        Complex or older infrastructure does not rule out an integration. Raagz IT can connect legacy systems that lack ready-made modules, build separate integration components, and use microservices or data buses where a direct link would be too limiting. They also prepare technical documentation, test the connection for security and stability, and handle later API changes through ongoing maintenance.

         

        Key Highlights:

        • Two-way and real-time data exchange
        • Support for legacy and enterprise systems
        • Integration through microservices and data buses
        • Technical documentation for completed connections
        • API testing for security, load, and stability

         

        Services:

        • Payment gateway integration
        • Third-party API integration
        • CRM and ERP integration
        • Social media API integration
        • E-commerce API integration
        • Location and mapping API integration

         

        Contact Information:

        • Website: raagz.it
        • E-mail: [email protected]
        • Twitter: x.com/RaagzIT
        • LinkedIn: www.linkedin.com/company/raagz-it-solutions
        • Address: 128, City Road, London, EC1V 2NX United Kingdom
        • Phone: + 44 7377 500 555
        Mobian

        6. Mobian

        Mobian develops mobile products that rely on third-party APIs to exchange information with external services and existing company systems. Their team can connect Android and iOS applications with analytics platforms, reporting tools, authentication services, payment systems, cloud backends, and internal databases. The integration work is planned around the app itself, so users do not have to move between separate tools to complete a basic task.

        Healthcare and fintech requirements influence how Mobian handles these connections. They pay attention to access controls, data security, reporting, and regulatory limits when integrating APIs with clinical trial systems or applications that process sensitive information. Mobian can also adapt the data flow to an existing software environment rather than replacing systems that are already working.

         

        Key Highlights:

        • Experience with healthcare and fintech software
        • Connections with analytics and reporting tools
        • Attention to secure handling of sensitive data

         

        Services:

        • Third-party API integration
        • Mobile backend integration
        • Analytics platform integration
        • Clinical trial system integration

         

        Contact information:

        • Website: mobian.studio
        • Email: [email protected]
        • LinkedIn: www.linkedin.com/company/mobian-studio
        • Address: Harju maakond, Tallinn, Kesklinna Linnaosa, Masina tn 22, 10113
        Orthoplex Solutions

        7. Orthoplex Solutions

        Orthoplex Solutions offers third-party API integration for payment processing, online stores, marketplaces, delivery systems, and specialized business software. They connect platforms such as CRMs, ERPs, inventory tools, fulfillment services, and payment gateways so orders, customer records, product information, and transaction data remain consistent across systems.

        Before deployment, Orthoplex Solutions maps permissions, authentication methods, rate limits, and compliance requirements. The integration is then tested in a sandbox environment before it reaches the live system, which reduces the chance of interrupting existing workflows.

         

        Key Highlights:

        • Sandbox testing before production deployment
        • Integration planning based on existing workflows
        • Support for regulated and sensitive data
        • Monitoring for API provider changes

         

        Services:

        • Payment gateway integration
        • E-commerce platform integration
        • Third-party API integration
        • Marketplace integration
        • Delivery and logistics API integration
        • CRM and ERP integration

         

        Contact Information:

        • Website: orthoplexsolutions.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/orthoplexsolutions
        • LinkedIn: www.linkedin.com/company/orthoplexsolutions
        • Instagram: www.instagram.com/orthoplexsolutions
        • Address: 80 Atlantic Ave, 4th Floor, Toronto, Ontario M6K 1X9
        • Phone: +1 (647) 557-7638
        A-listware

        8. A-listware

        A-listware handles third-party API integration through custom development teams that work with existing business platforms and external services. They design connections around the way data needs to move between applications, rather than treating the API as a separate technical layer. 

        From early planning through post-release support, A-listware manages the full integration cycle. Their developers create custom APIs when a ready-made option does not fit, test how connected systems respond under real operating conditions, and maintain integrations as software requirements change.

         

        Key Highlights:

        • Custom development teams for API-focused work
        • Secure connections between separate applications
        • Integration planning based on business workflows
        • Support across development, testing, and maintenance

         

        Services:

        • Third-party API integration
        • Custom API development
        • API testing
        • System connectivity planning
        • Integration maintenance

         

        Contact Information:

        • Website: a-listware.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/alistware
        • LinkedIn: www.linkedin.com/company/a-listware
        • Address: St. Leonards-On-Sea, TN37 7TA, UK
        • Phone: +44 (0)142 439 01 40
        Belitsoft

        9. Belitsoft

        Belitsoft develops and integrates APIs for web, mobile, cloud, SaaS, financial, healthcare, HR, e-commerce, and IoT systems. They work with REST, GraphQL, SOAP, webhooks, custom connectors, and intermediary API layers, depending on how the software is built and what the connected services allow. Their team can link modern applications with external tools or extend older software that was not originally designed for current integration standards.

        More technical integration work may involve authentication, rate limits, encryption, version control, monitoring, and failure recovery. Belitsoft also builds connections for language models, payment tools, CRMs, payroll systems, inventory platforms, marketplaces, shipping services, and mobile features such as geolocation or appointments. For systems that exchange large amounts of data, they can add caching, batching, event-driven processing, and dashboards that show failed syncs or performance issues.

         

        Key Highlights:

        • Integration support for modern and legacy software
        • Experience with REST, GraphQL, SOAP, and webhook-based connections
        • API monitoring, versioning, and error handling
        • Security controls for sensitive and regulated data
        • Support for cloud, mobile, web, SaaS, and enterprise systems

         

        Services:

        • REST and GraphQL API development
        • LLM API integration
        • Mobile and web API development
        • Third-party API integration
        • SaaS platform integration
        • CRM and HR system integration
        • E-commerce and payment API integration

         

        Contact Information:

        • Website: belitsoft.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/Belitsoft
        • Twitter: x.com/BelitsoftCom
        • LinkedIn: www.linkedin.com/company/belitsoft-llc
        • Address: 26/28 Hammersmith Grove, London W6 7HA
        • Phone: +44 (20) 3318-18-53
        Gilzor

        10. Gilzor

        Gilzor integrates third-party services as part of larger custom software builds. They connect web applications, mobile products, internal tools, and digital platforms with payment systems, CRM software, analytics tools, communication platforms, booking services, maps, and other external systems required by the product.

        Gilzor reviews the user flow, data logic, architecture, and possible failure points before development starts. They also account for error handling, performance, and maintenance after release, since an integration that works during testing can still cause problems when traffic grows or the provider changes its API. Their work combines integration development with business analysis, QA, architecture support, and ongoing product maintenance.

         

        Key Highlights:

        • API integration within complete digital products
        • Attention to user flows and data movement
        • Support for startups, SMBs, and product teams
        • Integration planning tied to product architecture
        • Post-launch testing and maintenance

         

        Services:

        • Third-party API integration
        • Web application integration
        • Mobile application integration
        • Business analysis
        • Architecture consulting
        • QA testing

         

        Contact Information:

        • Website: www.gilzor.com
        • E-mail: [email protected]
        • LinkedIn: www.linkedin.com/company/gilzor-softwaredevelopment
        • Address: Poland, Warsaw, Office 58, street Adama Mickiewicza 37, 01-625
        Encrypted Infoweb

        11. Encrypted Infoweb

        Encrypted Infoweb builds third-party API connections for web applications, mobile products, SaaS platforms, and internal business systems. They integrate payment processors, CRMs, ERPs, accounting tools, marketing platforms, shipping services, analytics software, and cloud applications. Depending on the setup, the connection may use REST, GraphQL, webhooks, OAuth, API keys, or JWT authentication.

        Their developers add retry logic, rate-limit controls, caching, logging, alerting, and error queues where the integration needs to keep running under heavier loads. Encrypted Infoweb also tests integrations in sandbox and staging environments before deployment, then monitors API versions and provider changes after launch.

         

        Key Highlights:

        • REST and GraphQL integration support
        • Authentication through OAuth, API keys, and JWT
        • Error handling and automated retry logic
        • Sandbox and load testing before deployment
        • Monitoring for endpoint and API version changes

         

        Services:

        • Payment gateway integration
        • Third-party API integration
        • CRM API integration
        • ERP API integration
        • SaaS and cloud platform integration
        • Social media and marketing API integration
        • Webhook development

         

        Contact Information:

        • Website: encryptedinfoweb.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/jasmeen.patel2
        • Twitter: x.com/encryptedweb
        • LinkedIn: www.linkedin.com/company/encryptedinfoweb
        • Instagram: www.instagram.com/encrypted_infoweb
        • Address: 729 – 742, R K World Tower, Opp Shital Park BRTS, 150 Feet Ring Road, Rajkot-360001, Gujarat, India
        • Phone: +91 9023849989
        SoftPro

        12. SoftPro

        SoftPro develops custom software with the Microsoft technology stack, including Azure, ASP.NET, .NET Core, C#, and SQL. They integrate third-party APIs with web applications, cloud platforms, CRM and HRM systems, business portals, and SaaS products. Their full-stack background allows them to handle both the backend connection and the parts of the interface that depend on external data.

        An integration may involve linking an application with an outside service, synchronizing records between systems, or adding automation to an existing process. SoftPro can build the required server-side logic, manage database changes, configure secure access, and deploy the connection within Azure or another cloud environment. They also provide support for software that needs to be adjusted as the external platform changes.

         

        Key Highlights:

        • Strong focus on Microsoft and .NET technologies
        • API integration within custom web and cloud software
        • Experience with CRM, HRM, SaaS, and ETL systems
        • Backend, database, and cloud development handled together

         

        Services:

        • Third-party API integration
        • Custom API development
        • .NET and ASP.NET backend development
        • Azure integration
        • CRM and HRM system integration

         

        Contact Information:

        • Website: soft-pro.pl
        • LinkedIn: www.linkedin.com/in/kyrylo-o 
        • Address: Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401, Warsaw, Poland
        • Phone: +48 571 282 759
        Shomon Soft

        13. Shomon Soft

        Shomon Soft connects business applications with payment gateways, cloud services, CRM platforms, ERP software, and other external tools. They use third-party APIs to synchronize platforms, automate repeated tasks, and add functions without rebuilding them inside the main application.

        Their integration work covers secure data transfer, error handling, system performance, and ongoing maintainability. Shomon Soft can apply these connections to web and mobile applications as well as business software such as inventory, accounting, pharmacy, point-of-sale, and management systems. 

         

        Key Highlights:

        • Integration with payment, CRM, ERP, and cloud platforms
        • Support for web, mobile, and business management software
        • Focus on stable data exchange
        • API connections for workflow automation

         

        Services:

        • Payment gateway integration
        • CRM and ERP integration
        • Cloud service integration
        • Third-party API integration
        • Platform synchronization
        • Business process automation

         

        Contact Information:

        • Website: shomonsoft.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/shomonsoft
        • Address: Dag-1076, Khilbarirtek, Gulshan, Vatara, Dhaka-1212
        • Phone: +8801912095925 
        Itexus

        14. Itexus

        Itexus focuses on third-party API integration for fintech products, including banking platforms, payment systems, trading software, digital wallets, and financial data applications. They connect products with open banking providers, payment gateways, market data services, identity verification tools, crypto platforms, and compliance systems. 

        Their team handles problems that often appear after an integration is already running, such as failed webhooks, duplicate transactions, rate limits, slow responses, and inconsistent data from different providers. Itexus builds retry queues, monitoring, access controls, and data normalization into the connection, then tests it before deployment. 

         

        Key Highlights:

        • Fintech-focused API integration
        • Webhook hardening and transaction retry handling
        • Integration with modern and legacy financial software
        • Security and compliance controls built into data flows
        • Monitoring for provider changes and failed connections

         

        Services:

        • Third-party fintech API integration
        • Open banking API integration
        • Payment gateway integration
        • Trading and market data integration
        • KYC and AML platform integration
        • Crypto and blockchain API integration

         

        Contact Information:

        • Website: itexus.com
        • E-mail: [email protected]
        • Facebook: www.facebook.com/itexus
        • Twitter: x.com/ItexusSoft
        • LinkedIn: www.linkedin.com/company/itexus
        • Instagram: www.instagram.com/itexus.soft
        • Address: 8, The Green, STE road, Dover, DE 19901
        Inition Technology

        15. Inition Technology

        Inition Technology connects existing applications with external systems through third-party APIs. They also design custom web APIs that allow other software to access selected functions or data from an internal platform. This covers both sides of integration work – using an outside service and making a company system available to approved external applications.

        The connections are used to reduce duplicate data entry, automate routine business processes, and extend software without rebuilding every feature from scratch. Inition Technology can apply this work to web applications, portals, mobile products, CRM systems, inventory tools, hospital software, and other business platforms.

         

        Key Highlights:

        • Integration between internal and external systems
        • Custom web APIs for controlled system access
        • Support for process automation
        • API work within web, portal, and mobile development

         

        Services:

        • Custom web API development
        • Business system integration
        • CRM integration
        • Third-party API integration
        • Web application development

         

        Contact Information:

        • Website: initiontechnology.com
        • E-mail: [email protected] 
        • Facebook: www.facebook.com/initiontechnology
        • Twitter: x.com/initiontech
        • LinkedIn: www.linkedin.com/company/inition-technology
        • Address: D-122, 3rd Floor, Sector-7, Noida, UP-201301 
        • Phone: +91-0120-4555082 
        21Century.Tech

        16. 21Century.Tech

        21Century.Tech delivers third-party integrations as part of full-stack software development. Their senior engineers can connect web applications, MVPs, internal tools, and product features with payment services, CRMs, analytics platforms, authentication tools, communication software, and other external systems. API work sits inside the wider product architecture, so the connection is built around the feature that depends on it rather than added as an isolated piece of code.

        Development is supported by AI tools for code drafting, testing, documentation, and refactoring, while engineers remain responsible for architecture and review. 21Century.Tech also deploys completed work to the client’s infrastructure or manages the release within its own setup.

         

        Key Highlights:

        • Senior-led API integration work
        • AI-assisted development with human code review
        • Integrations built within complete product features
        • Testing and documentation included in delivery

         

        Services:

        • Third-party API integration
        • Custom software development
        • Full-stack feature development
        • Integration testing
        • API documentation
        • Deployment and CI/CD support
        • Legacy code refactoring

         

        Contact Information:

        Net Devs

        17. Net Devs

        Net Devs handles third-party API integration within enterprise software, cloud platforms, and custom business applications. They work across .NET, Java, Node.js, Python, and Go, which allows them to connect external services without forcing the rest of the system onto a different stack. These integrations can support data exchange with SaaS tools, AI services, internal platforms, cloud systems, and customer-facing applications.

        Planning starts with the business rules, technical limits, and systems that need to exchange information. Net Devs then designs the integration architecture, builds the API connection, and tests it for security and correct data handling. Their cloud experience also covers deployment and infrastructure on Azure, AWS, and Google Cloud.

         

        Key Highlights:

        • Stack-agnostic integration development
        • Senior engineering oversight
        • Cloud-native delivery across major cloud platforms
        • Automated and manual testing
        • API work tied to enterprise architecture
        • Ongoing development after deployment

         

        Services:

        • Custom API development
        • Third-party API integration
        • Enterprise software development
        • Cloud platform integration
        • AI service integration
        • Backend development
        • Integration testing and QA

         

        Contact Information:

        • Website: net-devs.com
        • E-mail: [email protected] 
        • LinkedIn: www.linkedin.com/company/net-devs
        • Address: Obrzeżna 1D, 02-691 Warszawa, Poland
        • Phone: +48 571 282 759

        Conclusion

        Third-party API integration is rarely just about connecting one tool to another. The real work is making sure data moves correctly, errors are handled properly, and the connection still works when traffic grows or the provider changes something on its side. A weak integration can create more manual work than it removes, so planning, testing, and ongoing support matter just as much as the initial build.

        The companies in this article approach API integration from different angles. Some focus on fintech, enterprise systems, mobile apps, or cloud platforms, while others handle integrations as part of wider software development. The right choice depends on the systems involved, the sensitivity of the data, and how much long-term maintenance the connection will need. A clear technical scope usually makes that decision much easier.

        AI Summary