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openmobilehub/x402-android

Hardware-backed Android wallet for x402 payments. Generates secp256k1 seeds on-device, wraps them with a StrongBox-resident AES key, signs transferWithAuthorization per biometric tap, settles USDC on Base Sepolia. Four-step build from Node hello-world to a Pixel app, with companion notes on passkey + smart-wallet evolution.

KotlinApache-2.0Base

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