How I Built an Enterprise Biometric API From a $0 Budget and an Android Phone

A self-taught developer built a production-ready biometric face verification API called FaceID API using an Android phone and Cloudflare Workers, with features like face liveness detection and full project isolation. This API can be added to web or mobile apps in under 10 minutes and runs on a $0 budget. The security model includes one-time widget tokens, HMAC-SHA256 signature verification, and rate limiting. The developer used Termux and proot-distro to build the API on their Android phone.