MCP.Market

Gauge MCP server

online · 100% uptime
by CHANGCHINFU·io.github.CHANGCHINFU/mcp-gauge·v1.0.5
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Verify official facts with Bitcoin-anchored proof. 180+ signals, x402 pay-per-call.

B73/100grade B
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Safety scan
B73/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

Gauge tools (5, 1 write)

write = sends, deletes, buys or posts
  • find_signalFree

    FREE coverage + freshness manifest: which signal_id lines exist, how many entities each covers, and fresh/recent/stale counts - so you can check "is my entity covered and how fresh" BEFORE paying. Optional filters: industry, signal_id, entity.

  • get_official_recordFree

    Returns the REAL x402 payment challenge (accepts[]: network / asset / payTo / amount) for the paid endpoint that serves a given signal_id+entity, or any listed endpoint addressed directly by `path`. This tool does NOT deliver paid data and does NOT take payment - MCP has no payment layer. Pay at the returned url with your own x402 client (USDC on Base or Solana, gasless EIP-3009; pay from a plain EOA) and you receive the record directly, with record_hash you can verify offline. This tool only fetches the 402 challenge; it delivers no paid data and collects no payment.

  • purchase_optionswrite actionFree

    FREE. Ask how to pay for a listed endpoint and get every channel with its REAL status - including the ones that are wired but not open yet. Three channels exist: x402 micropayment (for an agent with a funded USDC wallet on Base), a stateless subscription Bearer token (for a person or team - no wallet, no private key, no account), and a card rail. This tool takes no payment and holds no key; it only tells you which doors exist and which are open today.

  • verify_citationFree

    FREE. Given a record_hash from any Truth Bear record, look it up and recompute the canonical hash server-side, returning whether it is a genuine Truth Bear official record plus a plain-language reverse lookup of what exactly that hash attests. Use this to check a citation you were handed by another agent or document BEFORE relying on it. No payment, no API key.

  • verify_triangularFree

    FREE. Cross-verify one GAUGE interweave line: it returns each official series ("leg") in the line with its own record_hash, current/previous values, expected direction and per-leg minMove deadband, plus a count-style state (directions_matched / direction_mismatch / inverse_consistent / not_comparable / insufficient) and N-of-M. Everything needed to recompute the verdict OFFLINE is in the response - verify each leg hash with verify_citation, then recompute dir=sign(current-previous) with the minMove deadband. Descriptive only: no forecast, no causation, no advice. No payment, no API key.

Public scan report

scanner v0.1.10 · 2026-10-29 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 2068ms17/20
  • Tool poisoning5 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 52 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 73/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Gauge compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
73/100
higher than 38% of 48,243 servers
Tools
5
the typical server has 7
Tools that change things
20%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
1,063 ms
faster than 12% of 30,027 servers

What its tools let an agent do: 4 read · 1 change

Install Gauge in Claude Code, Cursor or VS Code

claude mcp add --transport http mcp-gauge https://api.truthbear.co/mcp
Add to Cursor

What the publisher says

From the Gauge repository's README, as published. We do not edit it. Read it on GitHub

mcp-gauge — Verifiable facts for AI agents, pay-per-call via x402

Check official facts before your AI agent acts. 180+ signals from USGS, NOAA, SEC EDGAR, EPA, and more — each response includes multi-source cross-validation and a tamper-proof receipt anchored to Bitcoin via OpenTimestamps (proving the record set existed no later than the stamp time, not that it was collected on the data day). No API key, no signup. Pay per call in USDC on Base via x402.

Quick start

Claude Desktop

Add to your config (~/Library/Application Support/Claude/claudedesktopconfig.json on macOS, %APPDATA%\Claude\claudedesktopconfig.json on Windows):

{
  "mcpServers": {
    "gauge": {
      "command": "npx",
      "args": ["-y", "mcp-gauge-x402"],
      "env": {
        "EVM_PRIVATE_KEY": "0x..."   // optional — omit for free tools only
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project root (or global config):

{
  "mcpServers": {
    "gauge": {
      "command": "npx",
      "args": ["-y", "mcp-gauge-x402"],
      "env": {
        "EVM_PRIVATE_KEY": "0x..."   // optional — omit for free tools only
      }
    }
  }
}

Claude Code

claude mcp add gauge -- npx -y mcp-gauge-x402
# For paid tools, add the env:
claude mcp add gauge --env EVM_PRIVATE_KEY=0x... -- npx -y mcp-gauge-x402

Other MCP hosts

Any MCP client that supports stdio transport works. Command: npx -y mcp-gauge-x402, set EVMPRIVATEKEY in env for paid tools.

Alternative: install from GitHub (no npm account needed):

npx -y github:CHANGCHINFU/mcp-gauge

From source

git clone https://github.com/CHANGCHINFU/mcp-gauge && cd mcp-gauge
npm install && npm run build
node dist/index.js

Payment setup

How it works: When your agent calls a paid tool, the GAUGE server returns an x402 payment challenge. The MCP client automatically pays in USDC on Base (EIP-3009 gasless — no ETH needed) and retries the request. The receipt is included in every response.

Wallet safety:

  • Use a dedicated burner wallet with a small USDC balance — never your main wallet
  • The private key never leaves your machine (processed locally by x402-fetch)
  • Fund with just enough USDC for your expected usage
  • Network: Base mainnet (Coinbase L2)

Tools

Free (no wallet needed)

Paid — single-source verification

Paid — 3-source cross-validation bundles

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Gauge: common questions

Is Gauge MCP server safe?
Mostly: it is graded B (73/100). Read the Gauge safety report
How do I install Gauge?
It runs remotely at api.truthbear.co. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Gauge need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Gauge maintained?
The last commit was 59 days ago (2026-09-07). The latest release is v1.0.5.
Is Gauge up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Gauge compare with other MCP servers?
safety score 73/100 (higher than 38% of 48,243 servers); tools 5 (the typical server has 7); tools that change things 20% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.