Notes on x402 and agentic payments — grounded in the real price, latency and uptime data we collect, not marketing copy.
x402 turns the dormant HTTP 402 status code into a real payment handshake: an API answers with a price, your agent pays USDC on Base or Solana, and retries. No accounts, no API keys, no subscriptions.
A live ranking of x402 crypto-price APIs by their real per-call price — pulled from x402radar’s own quotes, not a marketing page. Updated automatically.