{
  "skill_id": "oracle-proof-ledger",
  "name": "Proof Ledger Oracle",
  "evaluation": "free",
  "quality": "agent-decision-grade",
  "price_usd": 0.001,
  "category": "Trust",
  "tier": "foundation",
  "tags": [
    "oracle",
    "sco",
    "proof",
    "ledger",
    "meta-oracle",
    "sealed",
    "esp",
    "x402",
    "depth:deep",
    "depth:outline_only",
    "demoted-default"
  ],
  "summary": "Meta-oracle over public /api/proof — unlock counts and last_verified only. Never invents metrics.",
  "when_to_use": [
    "Need sealed snapshot of public proof ledger for a skill",
    "Downstream agents require challengeable quality evidence"
  ],
  "outline": [
    "Read free eval: honesty policy — counts only from GET /api/proof, never invent GMV",
    "Canary: seal the current public ledger slice (unlocks, last_verified, by_skill)",
    "Compare sealed slice to live /api/proof; challenge if they diverge",
    "Hand off: agents may cite proof URLs only; no fabricated volume",
    "Done when: sealed pack + live proof agree or honest null if zero unlocks"
  ],
  "capabilities": [
    "Proof-ledger-only stats",
    "Sealed challengeable meta-packs",
    "Honest null when zero unlocks"
  ],
  "decision_criteria": [
    "You need this when: Need sealed snapshot of public proof ledger for a skill",
    "You get capability: Proof-ledger-only stats",
    "Budget fits: full unlock is $0.001 USDC on Base",
    "You can automate unlock via HTTP 402 without a browser",
    "You only need teaser/outline first — sealed src/ops stay locked until payment"
  ],
  "sealed_after_pay": [
    "SKILL.md (teaser public)",
    "agent-install.json (public meta)",
    "src/index.js (stub public; full after unlock)",
    "Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT"
  ],
  "challenge": "https://lvlltd.com/api/pay?skill=oracle-proof-ledger",
  "sample": "https://lvlltd.com/skills/oracle-proof-ledger/sample.md",
  "pack_meta": "https://lvlltd.com/api/packs?skill=oracle-proof-ledger",
  "teaser": "https://lvlltd.com/sealed/oracle-proof-ledger/",
  "proof": "https://lvlltd.com/api/proof",
  "standards": [
    "x402",
    "ERC-7857"
  ],
  "buy_agent": [
    "GET /skills/oracle-proof-ledger/outline.json",
    "GET /api/pay?skill=oracle-proof-ledger",
    "Settle USDC on Base to payTo",
    "POST /api/pay with X-PAYMENT {\"txHash\",\"skill\"}",
    "POST /api/mcp tools/call paid_api_call {\"skill_id\":\"oracle-proof-ledger\"}"
  ],
  "mcp": {
    "endpoint": "https://lvlltd.com/api/mcp",
    "tool": "paid_api_call",
    "arguments": {
      "skill_id": "oracle-proof-ledger"
    }
  }
}