{
  "headers_tried": [
    "PAYMENT-SIGNATURE",
    "X-402-Payment",
    "X-PAYMENT"
  ],
  "which_present": [],
  "preferred": "PAYMENT-SIGNATURE",
  "docs_alias_seen": true,
  "sit": false,
  "as_of": "2026-09-07T00:00:00.000Z",
  "reason": "Proof-header aliases tried [PAYMENT-SIGNATURE, X-402-Payment, X-PAYMENT]. present=[none]. preferred=PAYMENT-SIGNATURE. docs_alias_seen=true. A PAYMENT-SIGNATURE is never invented. Distinct from hdralias (PAYMENT-REQUIRED aliases).",
  "title": "Sig Alias Sample",
  "next": {
    "name": "sigalias",
    "title": "Sig Alias",
    "price": "$0.03",
    "method": "GET",
    "url": "https://openclawproductions.com/api/v1/sigalias"
  },
  "note": "Frozen unpaid Pipe Check 402 proof-header scan (2026-09-07). headers_tried=PAYMENT-SIGNATURE, X-402-Payment, X-PAYMENT. which_present=[]. preferred=PAYMENT-SIGNATURE. docs_alias_seen=true from a docs mention of X-PAYMENT (not a signature). A PAYMENT-SIGNATURE is never invented. Distinct from hdralias (PAYMENT-REQUIRED aliases). No live third-party fetch. Next paid GET is Sig Alias at $0.03."
}