Best API integration platforms to use with Claude Code, Cursor, and Codex (2026)

In the evolving landscape of API integration platforms for AI coding agents, four major platforms—Nango, Arcade.dev, Composio, and Merge Agent Handler—are evaluated based on their support for AI workflows, Model Context Protocol (MCP) compatibility, and runtime capabilities. Nango stands out as an open-source platform offering robust support for coding agents like Claude Code and Codex, enabling end-to-end integration development with a strong focus on real-time testing, observability, and extensive API catalog. Arcade.dev is tailored for MCP-first runtime environments, focusing on tool calling but lacking support for broader integration patterns or coding-agent development workflows. Composio provides a closed-source tool gateway with a significant pre-built tool catalog and managed authentication, suitable for internal productivity but limited in customization and data syncs. Merge Agent Handler offers pre-built connectors and tool packs for specific SaaS actions, but does not support custom tool calls or broader integration capabilities. Overall, Nango is highlighted as the most comprehensive platform for building and running API integrations with AI coding agents due to its open-source nature, extensive API support, and real-time operational features.

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