QuantaCipher is a post-quantum encryption API built on Kyber-1024 the NIST-standardized algorithm for key encapsulation. Unlike traditional encryption APIs, plaintext never leaves your device. All key generation happens in WASM on the client side. Free tier: 10,000 API calls/month. SDKs on npm and PyPI. Built for developers who need to be quantum-ready before it becomes a compliance requirement.