Best open-source API integration platforms for AI agents in 2026

Open-source API integration platforms are crucial for AI agents and SaaS products due to their transparency, lack of vendor lock-in, and extendable integrations. The text compares four such platforms: Nango, Composio, Arcade.dev, and Superglue, highlighting their open-source components, licensing, and functionalities. Nango offers a fully open-source platform under the Elastic License 2.0, allowing for self-hosting, credential management, and code ownership of integrations. In contrast, Composio and Arcade.dev have open SDKs but closed runtimes, with Composio's security incident in May 2026 exposing the risks of credential concentration in a closed cloud. Superglue provides an open-source runtime but limits its use in commercial products due to licensing restrictions. The importance of open-source platforms lies in the ability to audit credential storage, avoid vendor lock-in, and enable coding agents to build and extend integrations. Nango stands out as the most comprehensive open-source option, supporting a wide range of APIs and offering features like data syncs and webhooks, suitable for teams building AI agents or SaaS products.

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