Tool / Stateful API twins
WonderTwin
Local stateful twins of Stripe, Plaid, Shopify, GitHub and others that agents pull in over MCP, holding state, enforcing real rate limits and latencies, and replaying deterministically.
The summary describes what the project says it does; inclusion is not an endorsement.
Covers both service virtualisation and third-party rate limits, which is uncommon. 10 twins open source, the rest paid; announced joining LocalStack on 2026-09-14.
- Isolate
- Verify
AI-drafted