Best Unified APIs with a Free Trial of 2025

Boss Insights provides global leading access to business customers’ financial data with a single connection to accounting, banking, commerce, payroll, tax and more (i.e. Quickbooks, Stripe, SalesForce, etc.). It’s used by fintechs and neobanks to gain 60% increased automation, 100% automated scoring, 51% faster funding and 5x faster renewals.

Integration with 45+ shopping platforms equals more than 1 million potential customers. You can experiment with new capabilities, create new features, and win new clients with the most up-to-date functionality. We are always available to assist you with any business problems or challenges. API2Cart can also expand functionality to meet specific business requirements. You can experiment with new capabilities, create new features, and win new clients with the most up-to-date functionality.

Codat helps their clients build deeper connections with business customers. We offer products that make it easy to access, synchronize and interpret data from customers’ financial software for specific use cases, such as onboarding suppliers to commercial card programs and underwriting business loans. The depth of specialization and expertise that runs through our products and service enables our clients to more effectively grow share of wallet, reduce churn and scale operations.

Hosted platform solution for SaaS companies to build your integrations & marketplace. Grow your ecosystem with the #1 integration marketing platform. Showcase integrations, apps & partners. Easy to set up, no direct integration needed. Launch in less than 5 minutes. We offer you the building blocks and tools to manage your ecosystem. Import existing data from integration platforms like Zapier, Blendr, Piesync, Segment and many more. Manage your partners, integrations, categories, and collections from one place. Customize your ecosystem to the look and feel of your website & use your own custom domain. Our advanced search enables your clients & prospects to navigate through your ecosystem. Search engine optimized to get the best ranking for major search engines, such as Google and Bing. Our predefined templates enable you to choose out of a variety of ecosystem layouts. Apideck Ecosystem provides a way for all stakeholders to communicate & boost platform adoption.

We simplify the process of installing applications, tags, and integrations on your site while enabling you to monitor your analytics through a straightforward unified API. You can easily add or remove new third-party integrations by simply updating your stack, without needing to alter your code. We continuously introduce new integrations for you to explore each day. With Stackpile, you can track your customer event data and analytics, which will be automatically transmitted to all your connected applications, tools, and integrations. Keeping all your third-party applications and integrations current with the latest versions can be quite tedious, but Stackpile takes care of that for you. Our Unified Analytics API enables you to monitor custom events and user identities effortlessly. Stackpile helps you save time and reduce development expenses by routing data to all your applications and integrations, eliminating the need to implement each API individually. Typically, without Stackpile, you would have to add a separate code snippet for each integration you wish to install. After implementing Stackpile, you can seamlessly install any of our supported applications, tools, and integrations with just a single click, making the entire process efficient and user-friendly. This streamlined approach not only enhances productivity but also allows you to focus on other important aspects of your business.

The world is moving towards more standardized, open, and interconnected data networks. However, the employment infrastructure is still complex, closed, fragmented. Our mission is to make it easier for everyone to have access to the infrastructure that supports the employment sector. We also aim to unlock new ideas and generate tremendous economic activity for both employees and employers. It is easy to connect to your payroll and HR systems. Employee data is scattered across many closed systems. Finch combines the differences between systems to unify access and support many innovative use cases. You can add new systems to your system and turn them on with one click. Employers can grant you access to their payroll system and HR system. Finch Connect makes this process fast, secure, compliant. We focus on the right abstractions and developer experience in order to create the most powerful API interface for payroll and human resources systems.

Smartcar's vehicle API provides a wide array of functionalities such as verifying mileage, managing electric vehicle charging, issuing digital keys, and tracking fleets, among various other capabilities. This platform empowers mobility companies to seamlessly connect their applications and services with smart vehicles. You can effortlessly access vehicle information and initiate commands using our user-friendly and secure car API. Features include monitoring a vehicle's location, confirming mileage, charging an electric vehicle, sharing virtual keys, and additional services. Through the Smartcar Connect process, users can easily and quickly associate their vehicles with your application in just four clicks from either a mobile app or web interface. Our comprehensive documentation and software development kits facilitate rapid integration of our car API across diverse technology stacks, ensuring a smooth onboarding experience for developers. With Smartcar, managing connected vehicles has never been more straightforward.

Create a seamless patient journey that synchronizes instantly with your practice management system, offering a unique solution that both reads and writes data in real-time. We prioritize our engineering efforts on developing optimal bidirectional integrations with EHR and practice management systems. This advancement allows you to launch and refine your product in mere weeks instead of taking years. Our engineers actively utilize our own API to construct a doctor-facing SaaS product, ensuring that users receive a thoroughly tested and scalable experience. With online patient scheduling, potential clients can view your availability instantly and book appointments on-demand from any location or device. NexHealth's scheduling software is designed to perfectly customize your calendar straight out of the box. Our dedicated team of product experts is committed to assisting in the integration of both your calendar of record and EHR system, regardless of the complexity of your scheduling needs, ensuring a smooth and efficient implementation process. By enhancing these elements, we aim to significantly improve the overall efficiency of your practice.

Our Accounting Data as a Service API allows you to connect to all major accounting service providers. You can quickly build and deploy your application with just a few lines code. Get more accurate and complete information about your customers for a fraction of the market price You can see what your customer sees directly from the source. A beautiful front-end module is available to collect accounting data from your customers in real time. It is optimized to optimize conversion rates. All major accounting software providers are supported. This allows you to access financial transactions, insights, and reports on your customers on-demand. Developers can begin within minutes and have their software deployed within hours. We created the easiest and fastest API to meet all your accounting data requirements.

Hotglue allows developers to quickly offer user-facing SaaS integrations for their customers. Hotglue allows customers to connect to their third-party SaaS apps from within your web application. This makes it easy for you to securely ingest any data that you need. Our open-source library of connectors allows you to offer more integrations for your customers without requiring development resources.

Tray.ai serves as an API integration platform that empowers users to innovate, integrate, and automate their organizations without the need for developer expertise. With Tray.io, users can independently connect their entire cloud ecosystem. The platform features an intuitive visual workflow editor that makes it simple for users to construct and optimize processes. Additionally, Tray.io enhances the workforce's efficiency through automation of various tasks. At the core of the first iPaaS designed for universal accessibility is the intelligence that allows users to execute business processes through natural language commands. Tray.ai is a low-code automation solution tailored for both technical and non-technical users, enabling the creation of complex workflow automations that streamline data transfer and actions across diverse applications. By leveraging our low-code builder and the innovative Merlin AI, users can revolutionize their automation journey, combining the flexibility of scalable automation with advanced business logic and integrated generative AI features that are user-friendly and accessible to all. This makes Tray.ai an invaluable tool for organizations aiming to enhance operational efficiency.

Our goal is to equip the innovators of the future by delivering a comprehensive and powerful data framework tailored for the entire blockchain landscape. Dive into and contribute to the most extensive blockchain data available online. Consolidate historical balances, positions, and profit and loss across numerous DeFi platforms to create engaging and dynamic interfaces for your audience. Develop analytical dashboards that showcase asset price trends, liquidity, and return on investment. Take advantage of our quick start tutorials, how-to manuals, sample code, and more, enabling seamless integration of blockchain data into your project through the Covalent API. Covalent offers a cohesive API that ensures complete transparency and insight into assets across various blockchain networks. In essence, we provide a singular API that allows you to retrieve detailed and granular blockchain transaction information from multiple blockchains without requiring any coding expertise. This makes it easier than ever for developers to access and utilize blockchain data in their applications.

Argyle stands out as the premier supplier of direct access to real-time data regarding income and employment. By utilizing Argyle’s services, businesses can streamline essential operations like verifying income and employment, switching deposits, advancing wages, and facilitating loan repayments, ultimately leading to the creation of more efficient systems, minimized risk, and business growth. The company primarily caters to sectors such as mortgage lending, background verification, personal finance, banking, and also extends its services to the gig economy. As a result, Argyle plays a crucial role in transforming how these industries operate.