Cardano jumped roughly 30% in a week after the Cardano Foundation integrated the x402 AI payment protocol into its SDK and tested it on the pre-production testnet. XRP broke above $1.60 on a mix of x402 momentum and optimism from the Federal Reserve's rate decision, while on-chain data on both networks pointed to fresh capital rather than pure speculation.
Cardano climbed roughly 30% in a single week, moving from $0.19 on September 17 to an intraday high of $0.26 on September 23. The Cardano Foundation quietly added native support for the x402 payment protocol to its official SDK around September 21, then successfully tested it on the pre-production testnet.
XRP broke above $1.60, posting an approximate 22% gain tied largely to the Federal Reserve's interest rate decision on September 16, on a separate but overlapping wave of momentum.
What x402 does and who already uses it
The x402 protocol borrows its name from HTTP status code 402, "Payment Required," a code that existed since the early internet but was never widely implemented. Originally introduced by Coinbase in 2025, the standard is now governed by the Linux Foundation and enables automated, pay-per-use microtransactions for AI applications without traditional accounts or payment processors.
For Cardano, the integration means ADA or any Cardano-native token can serve as the settlement layer for these automated payments, though the successful testnet run confirmed the transaction flows work while mainnet deployment hasn't happened yet. XRP Ledger is further along: it already supports x402 and has logged over one million agent transactions, with thousands of on-chain payments processing per hour. Solana is also part of the growing x402 ecosystem.
On-chain activity backs the rally
Daily transactions on Cardano surged 71% during the week, reaching 33,919, and active addresses on both Cardano and XRP hit weekly highs. XRP's whale activity stood out further: over 1,900 transactions exceeding $100K were recorded, the highest count in a month, while new wallet creation also spiked.
Regulation stays stuck as the Fed moves markets
The Clarity Act, proposed legislation aimed at establishing clearer crypto rules in the US, failed to secure enough votes in the Senate, leaving the regulatory environment in the same ambiguous state it has held for years. XRP's move, however, drew more from the Fed's September 16 rate decision, which injected optimism across risk assets broadly.
XRP's million agent transactions and thousands of payments per hour give it a stronger fundamental floor than Cardano's earlier-stage testnet success. For ADA, the 30% surge prices in a lot of the good news already, and the token would need a smooth mainnet launch and meaningful adoption metrics to sustain these levels. The $1.60 level on XRP will be tested if macro conditions shift or regulatory headwinds intensify.
Source: Crypto Briefing
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