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Cardano (CRYPTO:ADA) rose 29.9% in the week ending September 23, 2026, jumping from $0.20 to $0.25, a gain driven by a single test transaction on the x402 payment standard and a short squeeze.
Meanwhile, XRP (CRYPTO:XRP) climbed 22% to $1.58, extending its lead over Cardano in both real-world payment processing and year-to-date performance.
The Cardano Foundation announced on September 21 that the network has joined x402, an open standard that allows software and AI agents to pay for online services via simple web requests.
This integration theoretically enables AI agents to pay for data requests using ADA or a Cardano stablecoin without requiring an account or API key.
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