YavonaLabs

Founder@ Yavona Labs. Building Invariant

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InvariantOpen-source business invariant engine for payment webhooks
Aug 2026

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Joined Product HuntAugust 21st, 2026

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Invariant - Open-source business invariant engine for payment webhooks

Invariant is an open-source CLI engine that continuously tests Stripe & Razorpay webhooks against real-world edge cases (duplicate deliveries, out-of-order refunds, tampered HMAC signatures) and mathematically proves database state post-conditions in under 10 seconds. - 🔒 100% Offline & Private (localhost) - ⚡ Zero Telemetry & Instant Local Execution - 🛡️ Works with Node.js, Python, Go, Java, Ruby Try it: npx @yavona/invariant init