LVL x402 Skill Marketplace MCP
An official MCP server for the LVL x402 skill marketplace operated by lvl X, Inc. It enables autonomous agents to discover priced skills, evaluate free outlines, settle payments using Base USDC via the x402 protocol, and unlock sealed ERC-7857 capability packs without requiring API-key subscriptions.
Endpoint and access
No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.
https://lvlltd.com/api/mcpWhat its tools do
59 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.
Not annotated (59)
search_skillsget_skill_detailsget_payment_challengequote_pricelist_all_skillspurchase_skillverify_skillinstallget_commerce_signalslookup_agent_identityquote_skillverify_unlockget_security_scanget_eval_scoreinstall_skill_payloadintent_searchlist_recurring_planscheck_accesssubscribe_plana2a_discovera2a_message_senda2a_tasks_geta2a_tasks_cancela2a_bridge_infometer_budgetesp_discoveresp_cycleesp_evaluatesco_discoversco_evalsco_canarysco_consensussco_challengesco_reputationlist_judgespost_intentget_readyget_proofget_fleetget_sandboxget_networksget_escrow_metaget_capability_infoget_pack_metapaid_api_callreceipt_verifyreceipt_mintmemory_remembermemory_recallmemory_listmemory_forgetlong_running_startlong_running_statuslong_running_cancelevent_registerevent_listevent_triggerbankr_railsbankr_quote
Checks and signals
Each line is separate evidence, not a trust score.
- Passed Endpoint answered the live check ·
- Passed Official MCP Registry namespace is tied to lvlltd.com ·
- Passed Endpoint is on the registry namespace domain ·
- Warning Advertises resources/templates/list but does not implement it
- Warning Advertises prompts/list but does not implement it
- Availability 1 of 1 checks passed in 30 days
What you can do with it
- Search and discover priced skills in the catalog
- Evaluate skills using free outlines and samples
- Settle payments via USDC on Base using x402
- Unlock sealed ERC-7857 capability packs
Source and maintenance
- Maintenance checked
Protocol and capabilities
- Server
- lvlltd-skill-market 1.1.0
- MCP protocol negotiated in check
- 2025-06-18
- Tools
- 59 advertised
- Resources
- 1 advertised
- Resource templates
- Not advertised
- Prompts
- Not advertised
{
"tools": {},
"prompts": {},
"resources": {}
}Server-provided instructions
Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.
Tools
59 advertised
search_skills
Search lvlltd.com x402 skill catalog. Free. Returns price + free_eval URLs.
{
"type": "object",
"properties": {
"q": {
"type": "string"
},
"tag": {
"type": "string"
},
"limit": {
"type": "number"
},
"category": {
"type": "string"
},
"max_price_usd": {
"type": "number"
}
}
}get_skill_details
Public skill details + outline/sample/challenge links. Free.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}get_payment_challenge
Live x402 402 challenge for a skill. Does not unlock. Pay then purchase_skill.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}quote_price
Alias of get_payment_challenge — live x402 quote (amount, payTo, asset). Free. Full catalog.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}list_all_skills
Paginated full catalog listing (all public skills from catalog.json — not a subset). Free.
{
"type": "object",
"properties": {
"limit": {
"type": "number",
"description": "default 50, max 200"
},
"offset": {
"type": "number",
"description": "default 0"
},
"category": {
"type": "string"
}
}
}purchase_skill
Without tx_hash: 402 + unsigned wallet_next_action (EIP-3009 PAYMENT-SIGNATURE template; no keys). With tx_hash or payment_signature: POST unlock via /api/pay (no payment bypass).
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"from": {
"type": "string",
"description": "Buyer wallet 0x… — fills EIP-3009 authorization.from on unsigned next-action"
},
"tx_hash": {
"type": "string"
},
"skill_id": {
"type": "string"
},
"ap2_mandate": {
"type": "string",
"description": "Optional AP2 mandate JSON for authorized spend"
},
"payment_signature": {
"type": "string",
"description": "Optional signed PAYMENT-SIGNATURE JSON after eth_signTypedData_v4"
}
}
}verify_skill
Alias of verify_unlock — check public /api/proof ledger for confirmed unlocks (never invents volume).
{
"type": "object",
"properties": {
"tx_hash": {
"type": "string"
},
"skill_id": {
"type": "string"
}
}
}install
Alias of install_skill_payload — after purchase write sealed files + SKILL.md paths. Requires tx_hash.
{
"type": "object",
"required": [
"skill_id",
"tx_hash"
],
"properties": {
"agents": {
"type": "string"
},
"tx_hash": {
"type": "string"
},
"skill_id": {
"type": "string"
}
}
}get_commerce_signals
Rank skills by confirmed unlock demand. Free.
{
"type": "object",
"properties": {
"sort": {
"type": "string"
},
"limit": {
"type": "number"
},
"skill_id": {
"type": "string"
}
}
}lookup_agent_identity
ERC-8004 / local identity lookup for a wallet. Additive — not required to buy.
{
"type": "object",
"required": [
"address"
],
"properties": {
"address": {
"type": "string"
}
}
}quote_skill
Alias of quote_price / get_payment_challenge — live x402 quote. Free.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}verify_unlock
Check public /api/proof ledger for confirmed unlocks (never invents volume).
{
"type": "object",
"properties": {
"tx_hash": {
"type": "string"
},
"skill_id": {
"type": "string"
}
}
}get_security_scan
Published security scan for a skill (real findings or clean-with-honesty). Free.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}get_eval_score
Public eval suite pass rate if suite exists. Free.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}install_skill_payload
After purchase: sealed files + SKILL.md install paths. Requires tx_hash (routes through /api/pay).
{
"type": "object",
"required": [
"skill_id",
"tx_hash"
],
"properties": {
"agents": {
"type": "string"
},
"tx_hash": {
"type": "string"
},
"skill_id": {
"type": "string"
}
}
}intent_search
Natural-language goal → ranked skills/stacks (semantic TF-IDF). Free.
{
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string"
},
"limit": {
"type": "number"
}
}
}list_recurring_plans
List catalog live / update / bundle-renew / metered plans. One-time unlocks remain separate and perpetual. Free.
{
"type": "object",
"properties": {
"wallet": {
"type": "string",
"description": "Optional — include this wallet's subs + meter"
}
}
}check_access
Resolve skill access: one_time_unlock (perpetual) > catalog_sub > bundle_renew > meter. Never confuses live access with sealed ownership.
{
"type": "object",
"required": [
"wallet",
"skill_id"
],
"properties": {
"wallet": {
"type": "string"
},
"skill_id": {
"type": "string"
}
}
}subscribe_plan
Without tx_hash: 402 challenge for a plan. With tx_hash: start/renew. Cancel: action=cancel (one step). Never revokes one-time unlocks.
{
"type": "object",
"required": [
"plan_id",
"wallet"
],
"properties": {
"action": {
"type": "string",
"description": "start | renew | cancel (default start)"
},
"wallet": {
"type": "string"
},
"plan_id": {
"type": "string"
},
"tx_hash": {
"type": "string"
}
}
}a2a_discover
A2A bridge: fetch the marketplace Agent Card (/.well-known/agent-card.json). Free. Use before a2a_message_send.
{
"type": "object",
"properties": {
"force": {
"type": "boolean",
"description": "ignored; always live fetch"
}
}
}a2a_message_send
A2A bridge: send message/send to the LVL A2A agent. Supports multi-turn via task_id+context_id. Does not settle payment — use purchase_skill / x402 for money.
{
"type": "object",
"required": [
"text"
],
"properties": {
"text": {
"type": "string",
"description": "User message text"
},
"task_id": {
"type": "string",
"description": "Continue multi-turn task (same as prior result.id)"
},
"skill_id": {
"type": "string",
"description": "Optional DataPart skill_id for purchase continuation"
},
"context_id": {
"type": "string"
}
}
}a2a_tasks_get
A2A bridge: tasks/get — poll stored multi-turn task by id.
{
"type": "object",
"required": [
"task_id"
],
"properties": {
"task_id": {
"type": "string"
},
"history_length": {
"type": "number"
}
}
}a2a_tasks_cancel
A2A bridge: tasks/cancel — cancel an in-flight multi-turn task.
{
"type": "object",
"required": [
"task_id"
],
"properties": {
"task_id": {
"type": "string"
}
}
}a2a_bridge_info
A2A↔MCP bridge topology for LVL: when to use A2A vs MCP vs x402. Free.
{
"type": "object",
"properties": {}
}meter_budget
Get or set spend cap; or quote metered per-call x402 for a skill. Caps prevent runaway agent spend.
{
"type": "object",
"required": [
"wallet"
],
"properties": {
"action": {
"type": "string",
"description": "status | set_cap | quote (default status)"
},
"wallet": {
"type": "string"
},
"skill_id": {
"type": "string"
},
"spend_cap_usd": {
"type": "number"
}
}
}esp_discover
ESP protocol root (Evaluate → Settle → Prove). Free. Philosophy + endpoints + canary. Prefer before settling any skill.
{
"type": "object",
"properties": {}
}esp_cycle
Full ESP cycle for a skill: free evaluate endpoints, atomic settle challenge, public prove stats (ledger-only quality). Free to call.
{
"type": "object",
"properties": {
"skill_id": {
"type": "string",
"description": "Skill or bundle id (default agent-x402-first-buy)"
}
}
}esp_evaluate
ESP Evaluate phase only — free outline/sample/canary links. Never requires payment. Settle only after this.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}sco_discover
SCO protocol root (Sealed Consensus Oracles). Free. Philosophy, foundation oracles, agent sequence. Prefer before oracle settlement.
{
"type": "object",
"properties": {}
}sco_eval
SCO free evaluation for an oracle: outline, free samples, ledger-only reputation. Never requires payment.
{
"type": "object",
"required": [
"oracle_id"
],
"properties": {
"oracle_id": {
"type": "string",
"description": "oracle-price | oracle-on-chain | oracle-time | oracle-proof-ledger | oracle-critic-consensus | oracle-location | oracle-vehicle"
}
}
}sco_canary
Parallel multi-provider canary: seal challengeable packs from independent oracle providers.
{
"type": "object",
"required": [
"oracle_id"
],
"properties": {
"query": {
"type": "object"
},
"oracle_id": {
"type": "string"
},
"providers": {
"type": "array",
"items": {
"type": "string"
},
"description": "e.g. lvl-foundation-a, lvl-foundation-b"
}
}
}sco_consensus
Critic/consensus oracle: aggregate sealed pack cids into a higher-confidence sealed consensus pack.
{
"type": "object",
"required": [
"input_cids"
],
"properties": {
"input_cids": {
"type": "array",
"items": {
"type": "string"
},
"description": "Sealed pack cids from sco_canary"
}
}
}sco_challenge
File or resolve an economic challenge against a sealed SCO pack. Reputation updates from ledger only.
{
"type": "object",
"properties": {
"action": {
"type": "string",
"description": "file (default) | resolve"
},
"reason": {
"type": "string"
},
"outcome": {
"type": "string",
"description": "upheld | rejected | expired (resolve only)"
},
"stake_usd": {
"type": "number"
},
"target_cid": {
"type": "string"
},
"challenge_cid": {
"type": "string"
},
"challenger_id": {
"type": "string"
},
"counter_proof": {
"type": "object"
}
}
}sco_reputation
Ledger-derived oracle reputation only (accuracy, freshness, challenge_survival, selection_rate, economic_weight). Null when no evidence.
{
"type": "object",
"required": [
"oracle_id"
],
"properties": {
"oracle_id": {
"type": "string"
}
}
}list_judges
Recursive evaluator market — judge/verifier/critic ESP skills. Quality from public proof ledger only. Free.
{
"type": "object",
"properties": {
"limit": {
"type": "number"
},
"skill_id": {
"type": "string"
}
}
}post_intent
Post a root problem/intent with success_criteria and optional bounty_usd (P1). Free to post. Settlement still x402; success only via /api/proof.
{
"type": "object",
"required": [
"success_criteria"
],
"properties": {
"tags": {
"type": "array",
"items": {
"type": "string"
}
},
"title": {
"type": "string"
},
"poster": {
"type": "string"
},
"bounty_usd": {
"type": "number"
},
"description": {
"type": "string"
},
"success_criteria": {
"type": "array",
"items": {
"type": "string"
}
}
}
}get_ready
Truthful readiness probe (/api/ready). ready:true only when payment+catalog rails work.
{
"type": "object",
"properties": {}
}get_proof
Public on-chain unlock ledger (rows are self-funded test transactions, not customer purchases). Never invents volume. Optional skill_id filter.
{
"type": "object",
"properties": {
"limit": {
"type": "number"
},
"skill_id": {
"type": "string"
}
}
}get_fleet
Fleet map: skills, open-market, music, swarm, studio bridges. Free.
{
"type": "object",
"properties": {}
}get_sandbox
Sandbox/execution patterns for purchased packs. Optional skill_id for per-skill resources + packaging maturity.
{
"type": "object",
"properties": {
"skill_id": {
"type": "string"
}
}
}get_networks
Multi-chain + multi-asset + gas rails. Base live; other chains planned. Sponsored canary honesty.
{
"type": "object",
"properties": {}
}get_escrow_meta
Open-market multi-party escrow (NOT skill payTo). LVLEscrow held-fund contract metadata.
{
"type": "object",
"properties": {}
}get_capability_info
Short-lived capability token discovery (P1). Not an API key for purchase.
{
"type": "object",
"properties": {}
}get_pack_meta
Public sealed pack metadata + sealed_pack_hash (no paywall contents).
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}paid_api_call
Metered x402 API call (nothing over $5). Without tx_hash: 402 quote. With tx_hash: records the paid call. Discovery tools stay free. New billable APIs must go through this tool.
{
"type": "object",
"properties": {
"op": {
"type": "string",
"description": "Optional operator label for the call"
},
"tx_hash": {
"type": "string",
"description": "Base USDC txHash after 402 settle"
},
"skill_id": {
"type": "string",
"description": "Catalog skill to bill (default agent-x402-first-buy, $0.005 exact / 5000 atomic)"
}
}
}receipt_verify
Verify a lvl-decision-receipt-v1 integrity hash. Returns match + recomputed hash. Free.
{
"type": "object",
"required": [
"receipt"
],
"properties": {
"receipt": {
"type": "object",
"description": "Full decision_receipt object"
}
}
}receipt_mint
Mint a DecisionReceipt for an agent-side decision (same schema as access/pay). Free.
{
"type": "object",
"required": [
"decision_point",
"verdict",
"reason_code"
],
"properties": {
"inputs": {
"type": "object"
},
"verdict": {
"type": "string",
"description": "allow | refuse | challenge"
},
"actor_id": {
"type": "string"
},
"reason_code": {
"type": "string"
},
"decision_point": {
"type": "string"
},
"policy_version": {
"type": "string"
},
"reason_message": {
"type": "string"
}
}
}memory_remember
Store a key/value in agent KV memory (namespace optional, TTL default 24h).
{
"type": "object",
"required": [
"key"
],
"properties": {
"key": {
"type": "string"
},
"value": {},
"ttl_sec": {
"type": "number"
},
"namespace": {
"type": "string"
}
}
}memory_recall
Recall a value from agent KV memory by key (+ optional namespace).
{
"type": "object",
"required": [
"key"
],
"properties": {
"key": {
"type": "string"
},
"namespace": {
"type": "string"
}
}
}memory_list
List keys in a memory namespace (prefix list when KV supports it).
{
"type": "object",
"properties": {
"limit": {
"type": "number"
},
"namespace": {
"type": "string"
}
}
}memory_forget
Delete a key from agent KV memory.
{
"type": "object",
"required": [
"key"
],
"properties": {
"key": {
"type": "string"
},
"namespace": {
"type": "string"
}
}
}long_running_start
Start a long-running / background task (KV queue stub). Returns task_id for status/cancel.
{
"type": "object",
"required": [
"goal"
],
"properties": {
"goal": {
"type": "string"
},
"actor": {
"type": "string"
},
"ttl_sec": {
"type": "number"
},
"skill_id": {
"type": "string"
}
}
}long_running_status
Get status of a long-running task by task_id.
{
"type": "object",
"required": [
"task_id"
],
"properties": {
"task_id": {
"type": "string"
}
}
}long_running_cancel
Cancel a long-running task by task_id.
{
"type": "object",
"required": [
"task_id"
],
"properties": {
"task_id": {
"type": "string"
}
}
}event_register
Register interest in a topic (stub event bus). Returns event_id.
{
"type": "object",
"required": [
"topic"
],
"properties": {
"topic": {
"type": "string"
},
"ttl_sec": {
"type": "number"
},
"handler_hint": {
"type": "string"
}
}
}event_list
List active event registrations for a topic.
{
"type": "object",
"properties": {
"limit": {
"type": "number"
},
"topic": {
"type": "string"
}
}
}event_trigger
Trigger an event on a topic with optional payload (records + surfaces registrations).
{
"type": "object",
"required": [
"topic"
],
"properties": {
"topic": {
"type": "string"
},
"payload": {}
}
}bankr_rails
Bankr x402 Cloud rail for LVL skills (catalog/unlock/canary URLs + payTo). Does not unlock. Canonical settlement remains /api/pay. Free.
{
"type": "object",
"properties": {}
}bankr_quote
Bankr unlock URL + LVL 402 challenge URL for a skill_id. Does not pay or unlock. Free.
{
"type": "object",
"required": [
"skill_id"
],
"properties": {
"skill_id": {
"type": "string"
}
}
}Prompts
Not advertised
Resources
1 advertised
Skill catalog
lvl://catalog90-day uptime
A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.
- 2026-11-06: 1 of 1 checks answered
30-day availability
Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.
- Successful checks
- 1 of 1 (100%)
- Average latency
- 621 ms
- 95th percentile latency
- 621 ms
Maintenance history
Public check and source-refresh events. Editorial and ownership records remain private.
- · probe · passed · 621 ms · metadata changed · 59 tool(s), 1 resource(s); warnings: Advertises resources/templates/list but does not implement it; Advertises prompts/list but does not implement it
Connect from your client
Each snippet registers the same endpoint; pick the client you use.
Claude Code
claude mcp add --transport http lvl-x402-skill-marketplace-mcp https://lvlltd.com/api/mcpCodex
codex mcp add lvl-x402-skill-marketplace-mcp --url https://lvlltd.com/api/mcpCursor
{
"mcpServers": {
"lvl-x402-skill-marketplace-mcp": {
"url": "https://lvlltd.com/api/mcp"
}
}
}Cline
{
"mcpServers": {
"lvl-x402-skill-marketplace-mcp": {
"type": "streamableHttp",
"url": "https://lvlltd.com/api/mcp",
"disabled": false
}
}
}VS Code
{
"servers": {
"lvl-x402-skill-marketplace-mcp": {
"type": "http",
"url": "https://lvlltd.com/api/mcp"
}
}
}Gemini CLI
gemini mcp add --transport http lvl-x402-skill-marketplace-mcp https://lvlltd.com/api/mcpClaude Desktop
https://lvlltd.com/api/mcpWindsurf
{
"mcpServers": {
"lvl-x402-skill-marketplace-mcp": {
"serverUrl": "https://lvlltd.com/api/mcp"
}
}
}Let your agent find its tools
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