Best Unified APIs in Europe

Merge is the leading
Unified API platform that enables B2B software companies to add hundreds of integrations to their products—making it easy for them to access and sync their customers’ data. ‍Merge's Unified APIs provide normalized data across key software categories, including accounting, HRIS, ATS, CRM, file storage, and ticketing. Merge also handles the full integrations lifecycle—from an easy initial build that takes just weeks to providing integration observability tools to help your customer-facing teams manage integrations. Thousands of companies—like BambooHR, Ramp, and Ema—trust Merge to power integrations that unblock sales, reduce customer churn, accelerate time to market for new products, and save engineering costs and resources.

APIPark is an open-source, all-in-one AI gateway and API developer portal, that helps developers and enterprises easily manage, integrate, and deploy AI services. No matter which AI model you use, APIPark provides a one-stop integration solution. It unifies the management of all authentication information and tracks the costs of API calls. Standardize the request data format for all AI models. When switching AI models or modifying prompts, it won’t affect your app or microservices, simplifying your AI usage and reducing maintenance costs. You can quickly combine AI models and prompts into new APIs. For example, using OpenAI GPT-4 and custom prompts, you can create sentiment analysis APIs, translation APIs, or data analysis APIs. API lifecycle management helps standardize the process of managing APIs, including traffic forwarding, load balancing, and managing different versions of publicly accessible APIs. This improves API quality and maintainability.

OpenGraph.io is a developer-focused web API service that fetches and returns structured metadata from any given URL, primarily Open Graph tags such as title, description, image, and other relevant page information, so applications can generate rich link previews, embed contextual content, and automate metadata extraction without building custom scrapers. It works even on pages that lack well-defined Open Graph tags by inferring missing values from the page’s HTML, and offers different endpoint capabilities, including pure Open Graph tag extraction, more extensive content extraction (headers, paragraphs, structured page text), full HTML scraping with JavaScript rendering support, and high-speed screenshot capture for visual previews of web pages. The API returns data in a consistent JSON format tailored for integration into workflows, dashboards, apps, and marketing or content platforms, and developers can call it programmatically using API keys with SDKs or standard HTTP requests.

APIFree is a unified AI Model-as-a-Service platform that provides developers and enterprises with seamless access to multiple leading AI models through a single standardized API layer. It aggregates mainstream open-source and proprietary models across text, image, video, audio, and code, allowing teams to integrate multimodal AI capabilities without managing separate vendor accounts, SDKs, or billing systems. Built to reduce infrastructure complexity, APIFree offers an OpenAI-compatible endpoint so applications can connect quickly while maintaining flexibility to switch between providers as needed. It emphasizes broad model coverage, lower end-to-end latency, and high availability, enabling organizations to focus on product innovation rather than platform fragmentation. With unified authentication, quota management, usage analytics, and cost controls at the platform level, APIFree simplifies AI deployment workflows and improves operational efficiency.

Modellix is a unified AI model API platform that aggregates the world's leading generative models — including Google Veo 3.1, GPT Image, Grok Imagine, Seedream 5.0, Seedance 2.0, Kling V3, Wan 2.7, Hailuo 2.3, Vidu Q3, PixVerse V6, and more — into a single API key and billing dashboard. Developers integrate once and access all models without multi-vendor management. Creators test models directly in browser Playground, no code required. The same key also opens the Modellix LLM gateway, with OpenAI- and Anthropic-compatible access to language models from OpenAI, Anthropic, Google, DeepSeek, Qwen, Moonshot, xAI, and ZAI. Backed by Aurora Mobile (NASDAQ: JG) with SOC 2 Type 2, ISO 27001, and ISO 27701 certifications and 15+ years of developer infrastructure experience.

Tray.ai is an API integration platform that allows users to innovate, integrate, and automate organization with no developer resources needed. Tray.io enables users to connect their entire cloud stack on their own. With Tray.ai, users can easily build and streamline processes with a specifically designed visual workflow editor. Tray.io also empowers the users' workforce with automated processes. The intelligence powering the first iPaaS that everyone can use to complete business processes using natural language instructions. Tray.ai is a low-code automation platform designed for both non-technical and technical users to create sophisticated workflow automations that facilitate efficient data movement and actions across multiple applications. Our low-code builder and new Merlin AI transform the automation process by bringing together the power of flexible, scalable automation; support for advanced business logic; and native generative AI capabilities that anyone can use.

Develop products and services, streamline your business processes, marketing, sales and finance with AI – all effortlessly. Boost your business with Scade Pro’s 1,500+ AI tools. Optimize from marketing to sales with no coding needed. Customize yourself or select our turnkey AI setup service. Unlock rapid development with Scade Pro’s unified API/SDK. Integrate AI quickly, reducing time and costs. Benefit from visual programming for smart features, with expert support available for ambitious projects. Quickly deliver projects using our no-code platform and unified API, cutting down on development time. Seamlessly integrate AI for top-tier solutions or profit from your apps on our marketplace. Offer your clients groundbreaking marketing tools and campaigns with AI through Scade Pro. Integrators, enhance client operations with deep automation in CRM and ERP. Boost sales and services using our technology, customized to meet your unique demands.

TartanHQ is a technology firm dedicated to resolving the challenges posed by fragmented systems within enterprises. It offers Unified APIs that integrate third-party applications like HRMS, CRM, and ERPs with the enterprise software and B2B SaaS Tools. Tartan also deploys AI-driven agentic apps to solve for Business process optimisation, automation, visibility, insights, intelligence, and efficiency within corporations.

EvoLink helps developers build production-ready AI applications through one unified API. It provides streamlined access to leading language, image, video, and audio models, with transparent pricing, intelligent routing, automatic failover, and centralized usage management. EvoLink is a unified AI model API platform for developers, startups, and engineering teams. Instead of integrating and managing each AI provider separately, users can access multiple models through one API key and a consistent integration workflow. The platform supports models for text generation, reasoning, coding, image generation and editing, video generation, and AI music. Developers can compare capabilities and pricing, switch models as requirements change, and manage usage and billing from one place.