The 800-API integration platform that wants AI to do the typing

What it does

Nango is an open-source platform for building product integrations with external APIs. It provides managed OAuth and token refresh for 800+ APIs, a proxy that injects credentials and handles retries, and a runtime for deploying TypeScript integration functions. You write the logic—or have an AI builder generate it from a description—and Nango handles execution, scaling, and observability.

The interesting bit

The AI builder is the twist: it generates readable, version-controllable TypeScript rather than opaque black-box workflows. Nango explicitly pitches itself as compatible with AI coding tools (Cursor, Codex, Claude Code) and agent SDKs like MCP and LangChain, positioning integrations as something you describe rather than hand-craft.

Key highlights

• Supports 800+ APIs with managed auth, including OAuth 1/2, API keys, and token refresh
• Three core primitives: Auth (white-label flows), Proxy (authenticated requests with rate-limit handling), and Functions (deployable TypeScript logic)
• Production runtime with per-tenant isolation, elastic scaling, and built-in retries
• Open source under the Elastic License; free self-hosting available with limited features, plus paid Cloud and Enterprise tiers
• Used in production by Replit, Ramp, Mercor, and “hundreds more” (per the README)

Caveats

• The “AI builder” is mentioned but not demonstrated in the README; actual quality and limits of generated code are unclear
• Free self-hosting carries a “limited feature set”—the exact boundaries aren’t specified
• Elastic License is not OSI-approved, which may matter for some redistribution scenarios

Verdict

Worth evaluating if you’re building a SaaS that needs to integrate with dozens of external APIs and want to reduce boilerplate auth code. Less compelling if you only need one or two simple integrations, or if you require a permissive open-source license throughout your stack.