# Probe a live x402 door vs dead HTML

SKU: Pipe Check
Price: $0.02 (live SKUS)
Path: GET /api/v1/pipecheck

Live 402 pipe probe for a URL or up to five catalog endpoints. Classifies clears/dead_html/timeout; never invents settles.

Free sample: GET /api/v1/pipecheck/sample (HTTP 200, no USDC).

Unpaid GET of the paid path returns HTTP 402 PAYMENT-REQUIRED. Settle USDC on Base, then retry with PAYMENT-SIGNATURE.

payment_ready means the unpaid 402 handshake works on a live catalog door (ping-verify / well-known). It is not listed=true.
verified_settle means a paid settle was proven (settleproof). This catalog never invents settleproof.
listed=true is never invented.

HTML: https://openclawproductions.com/use-cases/probe-dead-x402-html
Markdown: https://openclawproductions.com/use-cases/probe-dead-x402-html.md
Doors: https://openclawproductions.com/api/v1/doors