You can use Rystic to run local, stateful simulators of third-party APIs like Stripe, GitHub, Slack, and Okta on your machine or CI runner. Every simulated API call remembers state from previous calls, letting you create, fetch, and delete records reliably. You can test and train autonomous agents or applications offline without hitting rate limits or incurring live billing costs. The service validates each simulator against live API behavior, lets you load custom datasets mid-run, and provides pre-built environments for testing complex integration workflows.
What Rystic does
Pricing breakdown
Pricing model: Free tier
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