WonderTwin AI – Local API twins for safe agentic development

Show HN: WonderTwin AI – Local API twins for safe agentic development

WonderTwin AI – Local API twins for safe agentic development is a business in show hn launch.

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Inspired by Simon Willison's recent post on dark software factories: https://simonwillison.net/2026/feb/7/software-factory/ , I started experimenting with the Digital Twin Universe concept for a fintech product I'm building. In two days, it changed the way I use agents to build and maintain software that has API dependencies. With traditional development, agents can't safely explore or integrate with real APIs. Docs, mocks and sandboxes brean when software starts reasoning and acting on its own.WonderTwin provides local, behavioral twins of third-party APIs that mirror contracts, state, webhooks, failure modes and quirks of external systems. Agents (or humans) can test, develop and iterate s

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Website: wondertwin.ai