World Network, co-founded by Sam Altman, is discussing the addition of Visa card functionality to its self-custody cryptocurrency wallet.Tools for Humanity, the overseeing company, sent a request-for-product form to card issuers to explore the potential integration.World Network aims to enable stablecoin payments to merchants within the Visa network by adding on-chain card features.The company recently launched a mini app called World Chat and partnered with Razer to offer a secure gaming technology.