Census of automated x402 monitors and index crawlers observed polling a Bazaar listing on Base mainnet: user-agent prefix, operator URL, stated purpose, class (monitor or crawler), quotes served in the observation week. Updated weekly from live terminal logs.

Findings brief for data and API sellers: how AI agents with funded wallets behave at a paywall. 1,416 purchases and refusals across six models and three agent frameworks on x402, with the install checklist. Full text, markdown, September 2026.