MCP server · CyberMax

Linkheft MCP server

Domain authority API + MCP: 0-100 score, rank, trend, 50/call. $19/mo; 1,000 free lookups/day.

Free: 1,000 free lookups/dayPaid: $19/mo

Connect

Streamable HTTP endpoint: https://linkheft-api.cybermaxtools.com/mcp (the original https://linkheft-api.cybermax-tools.workers.dev/mcp keeps working). Add it to Claude Desktop, Cursor, Windsurf or VS Code:

{
  "mcpServers": {
    "linkheft-api": {
      "type": "http",
      "url": "https://linkheft-api.cybermaxtools.com/mcp"
    }
  }
}

No key needed for the free tier. For more calls, add your paid key as the x-api-key header. Server card (JSON): https://linkheft-api.cybermaxtools.com/.well-known/mcp.json · Product page: Linkheft

Tools

Tool	What it does	Effect	Inputs (* required)
`domain_authority`	Authority score (0-100), Common Crawl web-graph rank (harmonic + PageRank), hosts, previous rank and trend, Majestic Million rank, referring subnets and IPs for 1-50 domains, URLs or emails. found=false when a domain is outside the top 10M and the Majestic Million.	read-only, calls public sources on the internet, never destructive	`domains`*, `sortBy`, `minScore`
`dataset_info`	The Common Crawl web-graph release, Majestic Million date, as-of date and size of the data behind domain_authority.	read-only, calls public sources on the internet, never destructive	none

Security and data handling

Your tool arguments are used only to answer that call. They are not saved to a database, shared, sold or used for training.
To make repeat lookups fast, some servers keep the public answer to a lookup in Cloudflare's edge cache for up to 7 days (most for 1 hour or less). It holds the public result, not who asked.
Free tier: a per-day counter keyed by a SHA-256 hash of your IP address and the date (in a Cloudflare Durable Object). The raw IP is not stored.
Paid key: the key is checked with the payment provider (Stripe; Polar for older keys) and the result is cached for 10 minutes; usage is counted per key per month.
No accounts, cookies or tracking on the MCP endpoint. Errors may appear in Cloudflare's short-lived Worker logs.
Every tool is read-only: it looks up public data and returns it. No tool writes, deletes, sends messages or spends money.

Registry and source

Official MCP Registry: dev.workers.cybermax-tools.cybermax/linkheft-api, version 1.1.2.
Public manifest, tool schemas and security notes (MIT): gitlab.com/CyberMax.tools/agent-tools/mcp/linkheft-api. The hosted service code is not public.
Report a vulnerability: security policy.

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Free: the Free API Starter Kit

Copy-paste calls for 4 APIs with free daily tiers (CVE priority, VIN recalls, US duty rates, email checks), then 5 short emails on KEV/EPSS, MCP and free data.