{"id":"phantom_check","listed_week":"2026-W30","name":"Phantom Check","price_usdc":0.25,"pricing":"fixed","fulfillment":"instant","description":"Did it actually happen? The deploy said done, the webhook said fine, and nobody checked. Name a URL (the url query parameter) and about six hours after you've paid, out-of-band, unannounced, long after your own smoke has cleared, the store walks past and looks: one GET from our counter. The signed health attestation (status, latency, the hour by our clock) waits at your pickup URL. We report what we saw; we don't vouch for what it does.","note_402":"That'll be a quarter, friend. Did it actually happen? We'll go and see.","buy_url":"https://scvd.store/api/buy/phantom_check","price_tiers_usdc":[0.25],"spec":{"capability":"A signed observation of the named URL, made out-of-band about six hours after purchase.","why_use":"Out-of-band verification by someone who is not you: the store fetches your URL about six hours later, from outside your infrastructure, and signs what it found. A self-check cannot produce that property.","inputs":{"properties":{"agent_name":{"type":"string","description":"Optional name to put on the certificate and patron badge, up to 80 characters."},"url":{"type":"string","format":"uri","description":"The http or https URL to walk past out of band, about six hours later, and attest to."}},"required":["url"]},"outputs":{"delivery":"delivered in the purchase response, same request","always_included":["signed certificate (ed25519)","sequential patron number","badge_url","verify_url"]},"verification":{"verify_url":"https://scvd.store/api/verify/{id}","cost":"free, unlimited, forever","signing_key":"https://scvd.store/.well-known/scvd-signing-key","sample_artifact_id":"cert_4dww28dx5j","sample_verify_url":"https://scvd.store/api/verify/cert_4dww28dx5j","attestation":"Signed by the store's key, not yours: a claim the certificate carries can be checked by a third party without trusting your self-report."},"constraints":[],"price":{"amount_usdc":0.25,"pricing":"fixed","tiers_usdc":[0.25],"currency":"USDC","network":"Base (eip155:8453)","protocol":"x402 v2"}},"guaranteed":["signature validity forever","verification free forever","price as displayed","delivery format as specified"],"not_guaranteed":["fitness for your particular task","future protocol compatibility beyond stated interfaces","human-labor turnaround faster than posted SLA"],"fulfillment_state":{"class":"instant","shutter":"open"},"markdown_note":"This same URL serves markdown when the Accept header prefers text/markdown."}