LVL LTD Skill Market Agent

LVL LTD CO operates lvlltd.com: x402-native marketplace for sealed AI skills, paid in USDC on Base (247 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

Skills

• Search skill catalog
  Find any of 247 priced x402 skills by query, category, or max price. Free. Full catalog — not a subset.
  discoverycatalogx402mcp
• Get skill details
  Return public skill card: price_label, free outline/sample URLs, security/eval if present. Does not unlock sealed content.
  discoveryevaluation
• Quote x402 price
  Return live HTTP 402 payment challenge for a skill_id (amount, payTo, USDC on Base). Free.
  commercex402quote
• Purchase skill (x402)
  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.
  commercex402purchaseap2
• AP2 spending mandate (A2A DataPart)
  Optional AP2 extension: human-signed spend limits for buyer agents. Transmit as A2A DataPart (spending_mandate/intent_mandate) and present X-AP2-MANDATE on /api/pay for verified_authorized_purchase. Does not replace x402 settlement.
  ap2mandatea2a-extensioncommerce
• AP2 Shopping Agent (buyer orchestrator)
  How Shopping Agents buy from LVL: capture intent, draft Intent Mandate for user EIP-191 sign, discover this merchant Agent Card, present mandate over A2A, settle via x402. SA never forges signatures or settles money inside A2A. SDK: /sdk/ap2-shopping-agent.mjs
  ap2shopping-agentorchestratorcommerce
• Agent explainability (reasoning traces)
  Machine + human explainability for agent decisions: trace_id, steps, confidence, causal, counterfactual, human narrative, X-Agent-Explainability header. POST /api/explain. Never invents GMV — proof at /api/proof.
  xaiexplainabilityauditgovernance
• Verify purchase
  Check public /api/proof ledger for confirmed unlocks. Never invents volume.
  trustproof
• Install unlocked skill
  After verified unlock, write sealed pack files and SKILL.md install paths (npx lvl-skills).
  installskills
• ERC-8004 agent identity
  Lookup buyer/agent identity and local LVL reputation. Additive — never required to buy.
  identityerc-8004
• Commerce demand signals
  Rank skills by confirmed unlock demand (never fabricated volume).
  trustsignals
• MCP catalog tools
  Same marketplace tools via MCP JSON-RPC at /api/mcp for Claude/Cursor-class clients. Full catalog.
  mcpdiscovery

How to call

https://lvlltd.com/api/a2a

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