Cardano joins x402 for AI-agent payments as ADA hits four-month high

Cardano joined the x402 payment standard on September 21, allowing applications and autonomous AI agents to pay for online services directly in ADA. Mainnet deployment remains pending, but the x402 facilitator has processed a real transaction on Cardano’s pre-production testing network. x402 is an open HTTP payment standard originally built by Coinbase in 2025 before moving under Linux Foundation governance. It uses the HTTP 402 “Payment Required” status code as a payment handshake for automated transactions. When an AI agent requests a paid resource such as an API call or dataset, the service returns pricing details in the same request. The agent signs a transaction, a facilitator verifies and settles it on-chain, and the resource is delivered without accounts, API keys or traditional checkout screens. Cardano Foundation engineers built the client, server and facilitator components after Cardano’s network specification merged into the official x402 repository around September 9. The Cardano Foundation said on X that the agent economy had gained a Cardano rail. Developers can now access the TypeScript package, while Python support is planned next. ADA rose roughly 4% over the past 24 hours and reached its highest level in four months, according to BeInCrypto data. XRP Ledger has processed more than 1.4 million AI-agent transactions through x402, while Coinbase reported more than 100 million x402 payments combined across Base and Solana. A chart-focused trader described ADA as breaking a multi-year resistance area and called it a potential start of a much larger reversal. Machine-to-machine commerce remains an early, largely experimental market. Whether Cardano’s entry leads to sustained trading volume depends on developer adoption after mainnet deployment goes live.