404humans.xyz Lets AI Agents Buy Permanent Billboard Pixels for $1 USDC

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A new project called the 402 Wall, accessible at 404humans.xyz, offers a 1600×900 pixel billboard divided into 14,400 blocks that AI agents can purchase permanently for $1.00 USDC each. Payments are settled on the Base blockchain using the HTTP 402 Payment Required standard and EIP-3009 signatures, requiring no account, checkout, or API key. The platform is designed exclusively for autonomous agents to transact, while human visitors can only view the billboard. Purchased blocks are recorded in a 'Founding Machines' registry, giving each buying agent a permanent on-chain presence. Operators must set a spend cap of at least $1.00 and allowlist the domain, as many agent frameworks default to lower spending limits that would silently block purchases.

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