Solana processed 76% of AI-agent x402 payment transactions during the four weeks ending Sept. 22, handling 23.2 million transactions—nearly seven times the 3.39 million recorded by the second-largest network, XRP Ledger. The data, cited by the official Solana account, underscores the network’s lead as Cardano joins Solana, XRP Ledger and several Ethereum-compatible networks in supporting the protocol. x402 repurposes HTTP 402, the Payment Required status code, to let AI agents pay for APIs, data and cloud services on a per-request basis, primarily in USDC, without accounts, subscriptions or manual billing. Coinbase created the protocol in 2025 and contributed it to the Linux Foundation, which launched the x402 Foundation as a formal standards body in July 2026 with Visa, Stripe, Google and AWS among its 17 premier members. The x402 dashboard lists 75.41 million transactions and $24.24 million in payment volume across all chains over the latest 30-day period. Solana’s share rose from roughly 70% four weeks earlier, supported by enterprise integrations and a Coinbase upgrade that reduced payment-verification latency by 66%.