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Perimeter Watch MCP Server

by entradox Your server? Claim it
answering

Perimeter Watch is answering right now. Last checked 13 min ago. It exposes 4 tools.

Passive domain-perimeter checks — cert expiry, subdomain takeover, lookalikes — as agent tools

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 7 days of history
7 days agonow
100.0%
Uptime 24h
92 of 92 checks
4
Tools
read from the server
370 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 7 September 2026. No other catalogue keeps this.

7 Sep 4 tool descriptions were rewritten pw_health, pw_snapshot, pw_stats and 1 more
7 Sep a tool changed version

This one has been quiet for a while

Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

run in your terminal
claude mcp add perimeter-watch-scanner --transport http https://perimeter-watch-api-production.up.railway.app/mcp/
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "perimeter-watch-scanner": {
      "url": "https://perimeter-watch-api-production.up.railway.app/mcp/"
    }
  }
}
~/.codex/config.toml
[mcp_servers.perimeter-watch-scanner]
url = "https://perimeter-watch-api-production.up.railway.app/mcp/"
.cursor/mcp.json
{
  "mcpServers": {
    "perimeter-watch-scanner": {
      "url": "https://perimeter-watch-api-production.up.railway.app/mcp/"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "perimeter-watch-scanner": {
      "url": "https://perimeter-watch-api-production.up.railway.app/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.

health
pw_health
Liveness check for the Perimeter Watch API. Returns ok, service, version. Call first to verify connectivity before pw_snapshot.
snapshot
pw_snapshot
Run a free one-time external-perimeter scan on a domain you control. Checks TLS certificate expiry, domain renewal status, dangling CNAME takeover risk, and CT-log lookalike domains. Returns a rating plus per-check detail. NOT idempotent (each call consumes rate limit); takes 20-60s; rate-limited to 3 scans per IP per 24h. Args: domain: the domain to scan (e.g. example.com) authority: MUST be true — attests you or your principal own/manage this domain. Scanning third-party domains without authority is prohibited. Scan takes 20-60s. Rate limit: 3/IP/24h.
stats
pw_stats
Service funnel counters: page views, snapshots run, paid registrations. Read-only.
watch
pw_watch_status
Check whether a domain is enrolled on a paid weekly monitoring plan. Returns enrollment status. Paid plans add weekly re-scans with email briefs. Read-only lookup. Args: domain: the domain to look up (e.g. example.com)

Endpoints

URLTransportStateLatencyChecked
https://perimeter-watch-api-production.up.railway.app/mcp/ streamable-http answering 350 ms 13 min ago

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Perimeter Watch — questions

Answers built from our own checks of this server.

What can Perimeter Watch do?
It exposes 4 tools, read directly from the server on our last check. Among them: pw_health, pw_snapshot, pw_stats, pw_watch_status. 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 Perimeter Watch working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 370 ms. The bar chart above shows every period we have measured.
Is Perimeter Watch still maintained?
The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.
How do I connect Perimeter Watch?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Perimeter Watch need an API key?
No. Perimeter Watch 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 Perimeter Watch?
It answers our handshake in 370 ms on average, which is faster than 44% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.