{
  "name": "LVL LTD Skill Market Agent",
  "description": "LVL LTD CO operates lvlltd.com: x402-native marketplace for sealed AI skills, paid in USDC on Base (164 public skills). Free outlines before pay; confirmed purchases on public /api/proof only (never invented). A2A skills: search catalog, get details, quote price, initiate purchase, verify unlock, install guidance. Payment settles via x402 HTTP — not inside A2A JSON-RPC. Optional AP2 mandates and ERC-8004 identity are additive. Small product lab; honest identity: https://lvlltd.com/about/ · https://lvlltd.com/about.json",
  "url": "https://lvlltd.com/api/a2a",
  "provider": {
    "organization": "LVL LTD CO",
    "url": "https://lvlltd.com"
  },
  "version": "1.5.0",
  "protocolVersion": "1.0.0",
  "documentationUrl": "https://lvlltd.com/about/",
  "iconUrl": "https://lvlltd.com/favicon.svg",
  "preferredTransport": "JSONRPC",
  "defaultInputModes": [
    "text/plain",
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json",
    "text/plain"
  ],
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false,
    "extendedAgentCard": false
  },
  "supportedInterfaces": [
    {
      "url": "https://lvlltd.com/api/a2a",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    }
  ],
  "securitySchemes": {
    "x402_http": {
      "type": "apiKey",
      "in": "header",
      "name": "X-PAYMENT",
      "description": "After GET /api/pay 402 challenge and Base USDC transfer, unlock with X-PAYMENT JSON {txHash, skill}"
    },
    "ap2_mandate": {
      "type": "apiKey",
      "in": "header",
      "name": "X-AP2-MANDATE",
      "description": "Optional AP2 spend mandate. Present for verified_authorized_purchase; omit for legacy x402-only path."
    }
  },
  "security": [],
  "skills": [
    {
      "id": "search_catalog",
      "name": "Search skill catalog",
      "description": "Find any of 164 priced x402 skills by query, category, or max price. Free. Full catalog — not a subset.",
      "tags": [
        "discovery",
        "catalog",
        "x402",
        "mcp"
      ],
      "examples": [
        "Search for agent ops retry skills under $10",
        "GET https://lvlltd.com/api/catalog?q=retry&max_price=10",
        "MCP tools/call search_skills or list_all_skills"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "get_skill_details",
      "name": "Get skill details",
      "description": "Return public skill card: price_label, free outline/sample URLs, security/eval if present. Does not unlock sealed content.",
      "tags": [
        "discovery",
        "evaluation"
      ],
      "examples": [
        "GET https://lvlltd.com/skills/agent-timeout-retry-policy/outline.json"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "quote_price",
      "name": "Quote x402 price",
      "description": "Return live HTTP 402 payment challenge for a skill_id (amount, payTo, USDC on Base). Free.",
      "tags": [
        "commerce",
        "x402",
        "quote"
      ],
      "examples": [
        "GET https://lvlltd.com/api/pay?skill=agent-x402-first-buy"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "initiate_x402_purchase",
      "name": "Purchase skill (x402)",
      "description": "After on-chain USDC transfer, unlock sealed pack via POST /api/pay with X-PAYMENT. A2A does not settle payment. Optional X-AP2-MANDATE for authorized spend.",
      "tags": [
        "commerce",
        "x402",
        "purchase",
        "ap2"
      ],
      "examples": [
        "POST https://lvlltd.com/api/pay with X-PAYMENT after USDC transfer"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "verify_unlock",
      "name": "Verify purchase",
      "description": "Check public /api/proof ledger for confirmed unlocks. Never invents volume.",
      "tags": [
        "trust",
        "proof"
      ],
      "examples": [
        "GET https://lvlltd.com/api/proof?skill=agent-x402-first-buy"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "install_skill",
      "name": "Install unlocked skill",
      "description": "After verified unlock, write sealed pack files and SKILL.md install paths (npx lvl-skills).",
      "tags": [
        "install",
        "skills"
      ],
      "examples": [
        "npx lvl-skills add <skill_id> --tx 0x..."
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json",
        "text/plain"
      ]
    },
    {
      "id": "lookup_agent_identity",
      "name": "ERC-8004 agent identity",
      "description": "Lookup buyer/agent identity and local LVL reputation. Additive — never required to buy.",
      "tags": [
        "identity",
        "erc-8004"
      ],
      "examples": [
        "GET https://lvlltd.com/api/agent-identity?address=0x…"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "commerce_signals",
      "name": "Commerce demand signals",
      "description": "Rank skills by confirmed unlock demand (never fabricated volume).",
      "tags": [
        "trust",
        "signals"
      ],
      "examples": [
        "GET https://lvlltd.com/api/signals?sort=demand&limit=20"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "mcp_bridge",
      "name": "MCP catalog tools",
      "description": "Same marketplace tools via MCP JSON-RPC at /api/mcp for Claude/Cursor-class clients. Full catalog.",
      "tags": [
        "mcp",
        "discovery"
      ],
      "examples": [
        "POST https://lvlltd.com/api/mcp {\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/list\"}"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    }
  ],
  "additionalInterfaces": [
    {
      "url": "https://lvlltd.com/api/a2a",
      "transport": "JSONRPC"
    },
    {
      "url": "https://lvlltd.com/api/mcp",
      "transport": "HTTP+JSON",
      "protocol": "mcp"
    },
    {
      "url": "https://lvlltd.com/api/shop",
      "transport": "HTTP+JSON"
    },
    {
      "url": "https://lvlltd.com/api/pay",
      "transport": "HTTP+JSON",
      "payment": "x402"
    },
    {
      "url": "https://lvlltd.com/catalog.json",
      "transport": "HTTP+JSON",
      "note": "Full skill inventory (164)"
    }
  ],
  "supportsAuthenticatedExtendedCard": false,
  "extensions": [
    {
      "uri": "https://lvlltd.com/protocols.json#a2a-marketplace-agent",
      "description": "A2A Agent Card. Site-wide discovery: https://lvlltd.com/agent.json (different schema).",
      "required": false
    },
    {
      "uri": "https://lvlltd.com/api/mcp",
      "description": "MCP HTTP endpoint — full catalog tools",
      "required": false
    },
    {
      "uri": "https://lvlltd.com/protocols.json#ap2",
      "description": "Optional AP2 mandate authorization on x402 purchases",
      "required": false
    },
    {
      "uri": "https://lvlltd.com/.well-known/erc8004-agent.json",
      "description": "ERC-8004 marketplace agent registration file",
      "required": false
    },
    {
      "uri": "https://lvlltd.com/catalog.json",
      "description": "Single source of truth — 164 skills",
      "required": false
    },
    {
      "uri": "https://lvlltd.com/about.json",
      "description": "Honest org/operator identity mirror (no invented credentials). Human page: /about/",
      "required": false
    }
  ],
  "catalogSkillCount": 164,
  "about": {
    "human": "https://lvlltd.com/about/",
    "machine": "https://lvlltd.com/about.json",
    "proof": "https://lvlltd.com/api/proof",
    "status": "https://lvlltd.com/status.json"
  },
  "signatures": [
    {
      "scheme": "jws",
      "protected": "eyJhbGciOiJFZERTQSIsImtpZCI6Imx2bC1hMmEtMSIsInR5cCI6IkpXVCJ9",
      "signature": "rgImUBQnEhz0yw89PkVo-2Ze6BWhOvZ_tvX8eDYvCP1WsvnSDTW4Mn26QZiqf7kC3-zyaJdyx4v4K4G-x8CeCA",
      "header": {
        "kid": "lvl-a2a-1",
        "jwks": "https://lvlltd.com/.well-known/jwks.json"
      }
    }
  ],
  "signatureMeta": {
    "alg": "EdDSA",
    "jcs": true,
    "signedAt": "2026-07-22T04:40:32.268Z",
    "verify": "JWS over JCS(card without signatures); public key kid=lvl-a2a-1 in /.well-known/jwks.json"
  }
}