io.github.CHANGCHINFUPublished by GitHub account CHANGCHINFUv1.0.5Updated Oct 24, 2026
Verify official facts with Bitcoin-anchored proof. 180+ signals, x402 pay-per-call.
Remote MCP server that lets an assistant look up official public-data signals, verify Bitcoin-anchored record hashes, and pay per call in USDC via x402.
Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.
Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.
Read https://sourceweft.com/mcp/io.github.CHANGCHINFU%2Fmcp-gauge/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.Add this to your client's mcpServers config.
{
"mcpServers": {
"gauge": {
"type": "http",
"url": "https://api.truthbear.co/mcp"
}
}
}[MCP server score] [License: MIT] [Model Context Protocol]
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.
Add to your config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):
Add to .cursor/mcp.json in your project root (or global config):
Any MCP client that supports stdio transport works. Command: npx -y mcp-gauge-x402, set EVM_PRIVATE_KEY in env for paid tools.
Alternative: install from GitHub (no npm account needed):
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:
x402-fetch)Prices are set by the live x402 challenge (use gauge_preview to check current pricing). If you drive the API with your own x402 client, set maxValue to at least $0.25 — the default $0.10 makes your client reject bundle tools locally.
Every paid record carries a record_hash (canonical SHA-256). Daily Merkle roots are stamped to Bitcoin via OpenTimestamps. The stamp proves the record set existed no later than stamped_at. Re-check anytime:
gauge_anchor tool (free)POST /verify or /proof/:record_hash at the GAUGE APIots CLIDo I need ETH for gas? No. x402 uses EIP-3009 (gasless USDC transfer). You only need USDC on Base.
What if I don't set a private key? You can still use all 5 free tools. Paid tools will be listed but return an error when called.
Is my private key sent to the server?
No. The key stays on your machine. x402-fetch signs the payment locally and sends only the signed authorization to the GAUGE server.
What happens if the data isn't available? The tool honest-fails with no charge. You only pay when you get a result.
Can I verify the receipt without your server?
Yes. Download the OpenTimestamps attestation via gauge_anchor and verify with the standard ots CLI tool against any Bitcoin node — it proves the record set existed no later than the stamp time, not that it was collected on the data day.
https://api.truthbear.co/.well-known/x402, /llms.txtMIT · AEML-DS Vanished-Data Exchange
Source: README.md at commit b0b840f
Verify a Truth Bear record (free)
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.
record_hashrequiredFind which signals/entities are covered (free)
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.
fullentityindustrysignal_idGet the x402 payment challenge for a paid record
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.
dimpathentitysignal_idHow can I actually buy this? (free)
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.
pathCross-check a line of official series & recompute the verdict (free)
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.
linerequiredentityrequired100% of the applicable checks met
How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.
{ "mcpServers": { "gauge": { "command": "npx", "args": ["-y", "mcp-gauge-x402"], "env": { "EVM_PRIVATE_KEY": "0x..." // optional — omit for free tools only } } }}{ "mcpServers": { "gauge": { "command": "npx", "args": ["-y", "mcp-gauge-x402"], "env": { "EVM_PRIVATE_KEY": "0x..." // optional — omit for free tools only } } }}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-x402npx -y github:CHANGCHINFU/mcp-gaugegit clone https://github.com/CHANGCHINFU/mcp-gauge && cd mcp-gaugenpm install && npm run buildnode dist/index.js