FabTally Guard MCP Server

by zvmzaretsky Your server? Claim it

answering

FabTally Guard is answering right now. Last checked 11 min ago. It exposes 4 tools. Last commit 1 Aug 2026.

Verify before you act: deps-check, x402-preflight, json-repair & url-read for agents.

Uptime history 90 days of history · worst day 98%

90 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

145 ms

Response time

average over 24h

Stars

last commit 1 Aug 2026

Nothing serious here today

Today is the operative word: we check FabTally Guard every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add fabtally-guard --transport http https://guard.fabtally.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://guard.fabtally.com/mcp

~/.codex/config.toml

[mcp_servers.fabtally-guard]
url = "https://guard.fabtally.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "fabtally-guard": {
      "url": "https://guard.fabtally.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "fabtally-guard": {
      "type": "http",
      "url": "https://guard.fabtally.com/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

deps

deps_check

PAID $0.003 (x402, USDC on Base). Vet a software package BEFORE installing it. Returns existence, latest-vs-requested, deprecation/yank markers, known CVEs from OSV.dev, typosquat similarity to popular names, SPDX license, and age/download signals with a plain-English risk verdict. Args: ecosystem (npm|pypi|crates), name, version (optional). Without payment returns the x402 challenge; pass x_payment to settle.

json

json_repair

PAID $0.002 (x402, USDC on Base). Coerce near-miss LLM JSON to a JSON-Schema-conformant object: strip code fences/prose, fix trailing commas/quotes/unquoted keys, normalise Python literals, balance brackets, then coerce types, apply defaults, and drop extraneous keys. Returns the repaired object OR precise per-field errors. Args: json (the raw string), schema (a JSON Schema object). Without payment returns the x402 challenge.

url

url_read

PAID $0.004 (x402, USDC on Base). Fetch a PUBLIC url and return clean Markdown + a token estimate for RAG ingestion — readability extraction, boilerplate stripped. Respects robots.txt, public pages only, no login/paywall bypass, nothing stored. Args: url. Without payment returns the x402 challenge; pass x_payment to settle.

x402

x402_preflight

PAID $0.002 (x402, USDC on Base). Verify another x402 endpoint BEFORE paying it: does an unpaid call return a valid x402 v2 402 challenge? do the quoted amount/asset/network/payTo match the site's /.well-known/x402? is TLS valid, host reachable, openapi present? Returns pass/fail + per-check reasons + the parsed price you would pay. Args: url. Without payment returns the x402 challenge; pass x_payment to settle.

Endpoints

URL	Transport	State	Latency	Checked
https://guard.fabtally.com/mcp	streamable-http	answering	134 ms	11 min ago

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FabTally Guard — questions

Answers built from our own checks of this server.

What can FabTally Guard do?

It exposes 4 tools, read directly from the server on our last check. Among them: deps_check, json_repair, url_read, x402_preflight. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is FabTally Guard working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 145 ms. The bar chart above shows every period we have measured.

How do I connect FabTally Guard?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does FabTally Guard need an API key?

No. FabTally Guard completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is FabTally Guard?

It answers our handshake in 145 ms on average, which is faster than 84% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is FabTally Guard open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at guard.fabtally.com, which runs on its operator's own terms.