How do I install Lumen Pre Sign Check?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Lumen Pre Sign Check need an API key?

No required environment variable is listed on this record.

What transport does Lumen Pre Sign Check use?

Lumen Pre Sign Check is reached over HTTP.

When was Lumen Pre Sign Check last checked?

Last checked 2026-11-09. Use before signing an EVM tx or EIP-712 message: risk flags + verdict. Informational, no simulation

Lumen Pre Sign Check MCP server

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Add to Cursor Add in Claude Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Server URL

https://lumenworks-x402-decoder.onrender.com/mcp/presign

The Claude button above opens Claude with the name and URL filled in. You still confirm it there.

shClaude Code

1claude mcp add --transport http io.github.dansgit2b-lumen-presign-check https://lumenworks-x402-decoder.onrender.com/mcp/presign

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "io.github.dansgit2b-lumen-presign-check": {4      "command": "npx",5      "args": [6        "-y",7        "mcp-remote",8        "https://lumenworks-x402-decoder.onrender.com/mcp/presign"9      ]10    }11  }12}

claude_desktop_config.json

Remote · HTTPPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Remote

Transport: http
Version: 1.4.0
Last checked

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

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?}` — $0.001	public page → clean Markdown (Readability) + metadata. No JS rendering.
`/v1/web/unfurl` `{url}` — $0.001	final URL, status, title, description, OG image, canonical, favicon
`/v1/evm/address` `{address}` (0x or ENS) — $0.002	Ethereum+Base: ENS + records, EOA/contract/7702, balances, USDC/USDT, ERC-20 info (public RPC)
`/v1/domain/lookup` `{domain}` — $0.002	DNS (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)	Price	MCP tool	Upstream (free, no key)
`/v1/tx/explain`	0.002	`explain_before_sign`	calldata (openchain/4byte) + EIP-712, risk flags
`/v1/pubmed/search`	0.001	`pubmed_search`	NCBI E-utilities
`/v1/arxiv/search`	0.001	`arxiv_search`	arXiv API
`/v1/sec/filings`	0.001	`sec_filings`	SEC EDGAR (set `SEC_USER_AGENT` with a contact email per SEC policy)
`/v1/weather/forecast`	0.001	`weather_forecast`	Open-Meteo (CC BY 4.0)
`/v1/polymarket/markets`	0.001	`polymarket_markets`	Polymarket 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.

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Lumen Pre Sign Check?

Does Lumen Pre Sign Check need an API key?

What transport does Lumen Pre Sign Check use?

When was Lumen Pre Sign Check last checked?

Documentation

Lumen Works Agent API (x402)

MCP server

Celo

Free x402 payment safety check

Stats

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

Facilitators