Cardano and XRP add x402 support for AI payments as Solana leads
- —Cardano added to the official x402 package, but only one testnet transaction has run
- —XRP Ledger has supported x402 since June, settling in XRP and RLUSD
- —Solana leads x402 volume with about $24 million over a month by mid-August
- —Payments run almost entirely in USDC, with native SOL and ADA barely used
Why it matters: The x402 standard will decide which chain handles AI-agent payments, but current volumes remain small and largely test-driven.
Source: BTC-ECHO