Xeno

Xeno is a stablecoin payment scheme on Base that turns a phone into a contactless terminal: a user taps the handset against a merchant POS device to pay in USDC without opening an app. Android uses host card emulation to build the payment instruction outside the secure element, while iOS goes through the HCE-SE path to reach it, so card numbers and session keys never land in merchant systems and the card-data surface of conventional acquiring shrinks.

Settlement runs on-chain in USDC, with ERC-2771 meta-transactions abstracting gas: relays and a paymaster cover fees while the user only signs and holds no native token. Keys stay in the Android Keystore with mnemonic recovery. The merchant Terminal works with PAX and Verifone acquiring hardware, so on-chain clearing plugs into existing acceptance flows without hardware replacement. The 2025 build connected card emulation, meta-transactions and acquiring on Base, making stablecoin payment share one gesture with bank cards.