American Express has launched a new feature in its travel app, offering Ethereum-based "Travel Stamps" as ERC-721 NFTs. Users can earn these stamps each time they use their American Express card, with the NFTs minted and stored on the Coinbase network. While these stamps currently hold no transaction value and do not earn points, American Express aims to enhance users' travel record-keeping experience. The app update also includes new travel tools and upgraded Centurion Lounge services, potentially paving the way for future collaborations.