Cardano joins x402 AI payments standard as ADA rises 8%

Cardano has joined the official x402 software kit, giving AI agents a direct way to pay for services in ADA. CoinDesk reported Tuesday that x402 uses the web's "402 Payment Required" response as a checkout system for internet requests. A service provides its price and payment instructions, an AI agent signs the payment, and the transaction automatically unlocks requested data or computing power. The system could allow an agent to buy a single dataset without a person opening an account or paying for a monthly subscription. Coinbase created x402 in 2025 before transferring it to a Linux Foundation-backed organization whose members include Visa, Mastercard, Stripe, Google's Alphabet and Amazon Web Services. Solana and the XRP Ledger already support the standard, along with several Ethereum-compatible networks. Cardano Foundation engineers built the client and server software needed to request and verify payments after the specification was accepted in June. TypeScript support ships first, and Python support comes next. The team has completed a real transaction on Cardano's pre-production network, but the integration is not yet live on mainnet. Developers can begin integrating it, although AI agents are not yet paying for commercial services with ADA at scale. The Cardano Foundation said on X Monday that any app or AI agent can pay for an API call in ADA or any Cardano native token through a standard web request without an account, API key or checkout page. The foundation said every service already using x402 can enable Cardano. Wendy O posted on X that Cardano founder Charles Hoskinson predicts crypto will "eat" AI within five to ten years. His stated reasoning is that crypto addresses payment, alignment and data provenance problems that centralized AI systems cannot handle on their own. ADA rose 8% over the past 24 hours. A Tuesday market snapshot showed ADA trading at $0.2477, up 1%, after a 7% rise on Monday. That move took the price through the 0.618 Fibonacci retracement at $0.2310 and out of its recent consolidation range. The 20-day exponential moving average was above the 50-day and 100-day averages, and the Supertrend had turned bullish at $0.20. Listed key levels were $0.2563 as the 0.786 Fibonacci resistance and $0.2310 as the 0.618 Fibonacci retest and immediate support.