Best unified API platform for AI agents & RAG in 2026

AI agents require a different approach to API integration compared to traditional SaaS products, necessitating a unified interface for authentication, tool-call execution, data syncing, and webhook handling. Platforms such as Nango, Merge Agent Handler, Pipedream Connect, and Arcade each offer unique features for these integrations. Nango is notable for its code-first approach and support for over 700 APIs, making it suitable for teams needing custom tool calls and continuous data syncs. Merge Agent Handler provides pre-built tools but lacks data sync capabilities, whereas Pipedream Connect offers a low-code interface with a wide range of pre-built actions, but also lacks data sync support. Arcade specializes in stateless tool calling with an SDK for custom tool development but does not support data syncing or webhooks. The unified API demands arise from the need for AI agents to interact with external APIs efficiently, handling real-time updates and deterministic responses, which these platforms aim to address in different ways. Nango stands out for its comprehensive support for both AI agent tool calls and RAG data syncs, positioning it as a versatile choice for more complex and customizable AI integrations.

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