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Rystic
Rystic builds local, stateful simulators of the third-party APIs your agents depend on — Stripe, GitHub, Kalshi — validated against the real service, and safe to reset, manipulate, and break.
Key Features
Stateful Simulations
Every API call retains state, allowing for realistic testing of workflows.
Verified UIs
Simulations are validated against live APIs to ensure accuracy.
Local Execution
Run simulations on your laptop or CI runner without rate limits.
Use Cases
API testing
Development training
Integration testing
Pricing Plans
Free
$0
Pro
$89.99 per seat per month
Enterprise
Custom