Cardano has been added to the official x402 software kit, giving developers the tools to allow applications and AI agents to pay for online services using ADA or tokens issued on the Cardano network.
The x402 standard is designed to utilize the internet's "402 Payment Required" response by turning it into a checkout built directly into web requests. Under this system, a service responds with its price and payment instructions, after which an agent signs a transaction and receives the requested data or computing power once verified.
This mechanism allows autonomous agents—such as an agent preparing a report—to purchase a single dataset on demand, removing the need for human intervention, accounts, credit card details, or monthly subscriptions.
Originally created by Coinbase in 2025, x402 was later contributed to a Linux Foundation-backed organization that includes members such as Visa, Mastercard, Stripe, Google, and Amazon Web Services. Solana, the XRP Ledger, and several Ethereum-compatible networks already support the standard.
Cardano Foundation engineers followed a specification accepted in June to build the necessary client and server software to request payments, alongside a facilitator to verify and submit them. The initial Cardano release supports TypeScript, with a Python release planned next. While Cardano's TypeScript release has completed a transaction on a preproduction network, it has not yet operated on mainnet or demonstrated commercial payments at scale.
