{"preview":true,"note":"Response shape only. The paid GET /x402-listing-drift-check takes resource and an optional advertised_price, calls the resource with no payment, and compares the catalogue's claim against the price the origin states in its own 402. Demand for this route is not measured -- it was built because the defect it reports was measured on our own surface first: a route can be live, indexed and impossible to pay for, and nothing in the ecosystem reports that.","example":{"resource":"https://api.example.com/some-paid-route","status":"price_drift","advertised_price_usd":"$0.005","live":{"http_status":402,"price_usd":"$0.02","network":"eip155:8453","pay_to":"0x1bb64af7fe05fc69c740609267d2abe3e119ef82","header_bytes":7412,"latency_ms":486},"actionable":true,"detail":"The catalogue says $0.005; the origin's own 402 says $0.02 right now. The 402 is the authoritative statement, so a buyer budgeting from the catalogue is budgeting from a stale number.","checked_at":"2026-08-15T03:40:00.000Z"}}