{
  "skill_id": "add-x402-usdc-checkout",
  "name": "Add x402 USDC Checkout to Your Site",
  "evaluation": "free",
  "quality": "agent-decision-grade",
  "price_usd": 9.99,
  "category": "Commerce",
  "tier": "premium",
  "tags": [
    "x402",
    "usdc",
    "base",
    "checkout",
    "commerce",
    "payments",
    "merchant",
    "integration",
    "depth:standard"
  ],
  "summary": "Ship the same Base USDC x402 pay → verify → sealed unlock pattern LVL runs on lvlltd.com, swarm, and music — challenge, receipt, and unlock routes without inventing volume.",
  "when_to_use": [
    "You want micropayment checkout on Base USDC without SaaS billing",
    "You run a skill, media, or API market and need HTTP 402 challenges",
    "You need a reusable pattern proven on lvlltd.com / swarm / music"
  ],
  "outline": [
    "Declare price, payTo, asset (USDC on Base 8453) in a 402 challenge body with x402Version and x402_version",
    "Serve free evaluation (outline/sample) before payment",
    "Accept on-chain USDC transfer to payTo; verify receipt on Base",
    "Unlock sealed payload only after verification; re-download with same tx",
    "Publish proof only from confirmed ledger — never invent volume"
  ],
  "capabilities": [
    "402 challenge JSON templates (v1 and v2 fields)",
    "Base USDC constants and payTo wiring checklist",
    "Human MetaMask and agent X-PAYMENT unlock paths",
    "Honesty/ledger notes for public metrics"
  ],
  "decision_criteria": [
    "You need this when: You want micropayment checkout on Base USDC without SaaS billing",
    "You get capability: 402 challenge JSON templates (v1 and v2 fields)",
    "Budget fits: full unlock is $9.99 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=add-x402-usdc-checkout",
  "sample": "https://lvlltd.com/skills/add-x402-usdc-checkout/sample.md",
  "pack_meta": "https://lvlltd.com/api/packs?skill=add-x402-usdc-checkout",
  "teaser": "https://lvlltd.com/sealed/add-x402-usdc-checkout/",
  "proof": "https://lvlltd.com/api/proof",
  "standards": [
    "x402",
    "ERC-7857"
  ],
  "buy_agent": [
    "GET /skills/add-x402-usdc-checkout/outline.json",
    "GET /api/pay?skill=add-x402-usdc-checkout",
    "Settle USDC on Base to payTo",
    "POST /api/pay with X-PAYMENT {\"txHash\",\"skill\"}"
  ]
}