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Lumen Pre-Sign Check

Registre officiel Finance et paiements

Use before signing an EVM tx or EIP-712 message: risk flags + verdict. Informational, no simulation

Code source Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http lumen-pre-sign-check 'https://lumenworks-x402-decoder.onrender.com/mcp/presign'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "lumen-pre-sign-check": {
            "type": "http",
            "url": "https://lumenworks-x402-decoder.onrender.com/mcp/presign"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Lumen Works Agent API (x402)
  2. MCP server
  3. Celo
  4. Free x402 payment safety check
  5. Stats
  6. v1.3: explain-before-you-sign + public-data tools

Lumen Works Agent API (x402)

Two listings on one origin:

  • Lumen Pre-Sign Check: POST /v1/tx/explain ($0.002). Use before signing any EVM transaction or EIP-712 message; returns {summary[], flags[], verdict} with looks_ok | review | do_not_sign_unless_intended. Agent policy: abort on do_not_sign_unless_intended, escalate review. Informational, not a security guarantee; looks_ok does not mean safe; no simulation. Accuracy set and known limits: ACCURACY.md. MCP: /mcp/presign.
  • Lumen Agent Utilities: every other route below. MCP: /mcp.

Trust terms: no signup; free tier 20 calls/hour/IP under /v1/free/...; GET/HEAD on any paid path returns the 402 quote (it never settles); not charged when a call errors, because the x402 middleware settles only after the handler returns a status below 400. Input schemas and real example outputs (examples.json, captured live by test/capture-examples.mjs) are in each route's Bazaar extension and in /openapi.json, validated with node test/validate-bazaar.mjs <base>.

Stats: /v1/stats has anonymous aggregates only (UA family, daily unique counts from salted daily-rotating IP hashes, 30-day retention). They persist across deploys when STATS_GIST_ID + STATS_GIST_TOKEN (a gist-only token) are set; otherwise they are kept in memory.

Pay-per-call agent utilities, 0.001–0.002 USDC per call on Base mainnet via x402 (exact scheme, PayAI public facilitator). Author: Dan (Dansgit2b). Early-stage, unaudited.

Endpoint (POST JSON)What
/v1/x402/lint {header}decode + lint x402 PAYMENT-REQUIRED/SIGNATURE/RESPONSE
/v1/eip712/decode {typedData}domain separator, digest, risk notes
/v1/calldata/decode {data, signature?}selector, openchain/4byte lookup, decoded args
/v1/web/markdown {url, fullPage?, maxChars?} — $0.001public page → clean Markdown (Readability) + metadata. No JS rendering.
/v1/web/unfurl {url} — $0.001final URL, status, title, description, OG image, canonical, favicon
/v1/evm/address {address} (0x or ENS) — $0.002Ethereum+Base: ENS + records, EOA/contract/7702, balances, USDC/USDT, ERC-20 info (public RPC)
/v1/domain/lookup {domain} — $0.002DNS (DoH) A/AAAA/MX/NS/TXT/CAA, SPF/DMARC, RDAP registrar/created/expiry, age

Free tier: same paths under /v1/free/... (20/hour/IP). Discovery: /, /.well-known/x402, /openapi.json, /llms.txt. payTo: 0xee9790cB3960952F585379F831a89b4e00B4029A.

End-to-end proof (local run, 2026-10-10): paid call settled on Base, tx 0xff4af45df7caeef958b77700e96ba94e5ed37d3bac6e8cf40d6528a9497d77d4.

Deploy: Render (render.yaml, free plan) or any Docker host (Dockerfile). Set PUBLIC_BASE to the public origin. No secrets needed (server only receives payments). License MIT.

MCP server

Remote MCP (streamable HTTP, stateless JSON): https://lumenworks-x402-decoder.onrender.com/mcp, with tools x402_lint, eip712_decode, calldata_decode, web_markdown, url_unfurl, evm_address_lookup and domain_lookup. Free tier: 20 tool calls/hour/IP. After that the tool returns the x402 payment requirements for the matching paid HTTP endpoint (0.001–0.002 USD).

Celo

When X402_CELO_API_KEY (from the x402.celo.org dashboard) is set, every paid route also accepts USA₮ and USDC on Celo (eip155:42220), settled through Celo's hosted facilitator at api.x402.celo.org.

Free x402 payment safety check

POST /v1/x402/safety-check (MCP tool x402_payment_safety_check) — deterministic pre-payment check. Body: {url?, method?, payment_required?, expected_pay_to?, expected_network?, max_price_usdc?, listed_price_usdc?, facilitator_url?, client_config?}. We fetch the unpaid 402 (SSRF-guarded) and return ok | review | do_not_pay with checks: HTTPS/health/latency, payTo validity/checksum/mismatch, unknown asset/network, price vs your cap and the listed price, timeout/replay window, multiple payTo, unknown facilitator, missing spend caps / idempotency in your client config. Nothing is stored; inputs that look like private keys are rejected. 30/hour/IP.

Planned (not built): continuous monitoring with alerts on price/payTo/asset changes. Free waitlist: POST /v1/monitoring/waitlist {endpoint_url, contact?} (5/hour/IP). No date promised; stored in memory/logs only on a free host, so it may be lost on restart.

Stats

GET /v1/stats — anonymous in-memory counters since last restart: calls per endpoint, unpaid 402s vs paid settlements (conversion), coarse user-agent buckets. No IPs or bodies stored.

v1.3: explain-before-you-sign + public-data tools

Endpoint (POST)PriceMCP toolUpstream (free, no key)
/v1/tx/explain0.002explain_before_signcalldata (openchain/4byte) + EIP-712, risk flags
/v1/pubmed/search0.001pubmed_searchNCBI E-utilities
/v1/arxiv/search0.001arxiv_searcharXiv API
/v1/sec/filings0.001sec_filingsSEC EDGAR (set SEC_USER_AGENT with a contact email per SEC policy)
/v1/weather/forecast0.001weather_forecastOpen-Meteo (CC BY 4.0)
/v1/polymarket/markets0.001polymarket_marketsPolymarket Gamma (read-only data)

Free tier: /v1/free/<path> or MCP, 20 calls/hour/IP.

Facilitators

If CDP_API_KEY_ID and CDP_API_KEY_SECRET are set, Coinbase's CDP facilitator is used first. Settlements through it are what get the service indexed in the x402 Bazaar. The PayAI facilitator stays registered as the fallback. Without CDP keys, PayAI handles everything, as before.

Questions fréquentes

Qu'est-ce que Lumen Pre-Sign Check ?

Use before signing an EVM tx or EIP-712 message: risk flags + verdict. Informational, no simulation

Comment installer Lumen Pre-Sign Check ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http lumen-pre-sign-check 'https://lumenworks-x402-decoder.onrender.com/mcp/presign'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Lumen Pre-Sign Check ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

Lumen Pre-Sign Check est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Lumen Pre-Sign Check ?

Il est publié par Dansgit2b. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.