LVL LTD Skill Market Agent
LVL LTD CO operates lvlltd.com: x402-native marketplace for sealed AI skills, paid in USDC on Base (250 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
AgentCard object — a capabilities object, a declared protocolVersion, and a well-formed skills array.
An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.
https://lvlltd.com/api/a2a
· transport JSONRPC
· protocol https://lvlltd.com/api/mcp
· transport HTTP+JSON
· protocol mcp
https://lvlltd.com/api/shop
· transport HTTP+JSON
· protocol https://lvlltd.com/api/pay
· transport HTTP+JSON
· protocol https://lvlltd.com/catalog.json
· transport HTTP+JSON
· protocol https://lvlltd.com/api/a2a
· transport JSONRPC
non-standard supportedInterfaces
Search skill catalog search_catalog
Find any of 250 priced x402 skills by query, category, or max price. Free. Full catalog — not a subset.
discoverycatalogx402mcpGet skill details get_skill_details
Return public skill card: price_label, free outline/sample URLs, security/eval if present. Does not unlock sealed content.
discoveryevaluationQuote x402 price quote_price
Return live HTTP 402 payment challenge for a skill_id (amount, payTo, USDC on Base). Free.
commercex402quotePurchase skill (x402) initiate_x402_purchase
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.
commercex402purchaseap2AP2 spending mandate (A2A DataPart) ap2_spending_mandate
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-extensioncommerceAP2 Shopping Agent (buyer orchestrator) ap2_shopping_agent
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-agentorchestratorcommerceAgent explainability (reasoning traces) agent_explainability
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.
xaiexplainabilityauditgovernanceVerify purchase verify_unlock
Check public /api/proof ledger for confirmed unlocks. Never invents volume.
trustproofInstall unlocked skill install_skill
After verified unlock, write sealed pack files and SKILL.md install paths (npx lvl-skills).
installskillsERC-8004 agent identity lookup_agent_identity
Lookup buyer/agent identity and local LVL reputation. Additive — never required to buy.
identityerc-8004Commerce demand signals commerce_signals
Rank skills by confirmed unlock demand (never fabricated volume).
trustsignalsMCP catalog tools mcp_bridge
Same marketplace tools via MCP JSON-RPC at /api/mcp for Claude/Cursor-class clients. Full catalog.
mcpdiscovery2026-09-19 from https://lvlltd.com/.well-known/agent-card.json,
HTTP 200. The body was saved verbatim and is the sole source for
everything on this page — no field is inferred.
View the captured card.
Providers change what they serve; if this card has moved or changed shape,
the provider profile carries the
current state as of the last build.
Work with this as data
Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.