WhisperGraph MCP Server

The internet's infrastructure graph for AI agents — 46B nodes and edges mapping DNS, IPs, ASNs, BGP, WHOIS, Web links and threat intel. Sign up programmatically in 2 HTTP calls.

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WhisperGraph is an MCP server backed by the world's largest internet-infrastructure graph database — 46 billion nodes and edges across 20 entity types, mapping every domain, IP, ASN, prefix, organization, Web link and threat-intelligence listing into a single Cypher-queryable graph. Used by security teams, incident responders, and AI agents for investigation, attribution, brand protection, and infrastructure forensics.

Built for agents from day one.

• Programmatic signup in 2 HTTP calls. No browser, no CAPTCHA, no human-in-the-loop. Email verification only. Working API key in ~5 seconds.
• Free trial for everyone, including agents. Paid tiers for higher quotas.

What you can ask:

• DNS: resolution, nameservers, MX, SPF chains, DNSSEC
• Routing: ASN ownership, BGP origin history, MOAS conflicts, peering
• Hosting & ownership: registrar, WHOIS contacts, organization mapping
• Threat intel: ~40 feeds across 18 categories, CALL explain() for full threat scoring
• Historical: WHOIS history, BGP route changes
• Web: 10.9B hyperlinks for inter-domain analysis

Learn more: Agent signup · WhisperGraph intro · Cypher API reference · Query guide · Cypher syntax · Functions · Best practices · MCP setup

Quick start

You need a WhisperGraph API key. Get one either:

• Programmatically (recommended for agents) — see Agent quickstart below.
• Via the dashboard (recommended for humans) — console.whisper.security/sign-up.

Hosted remote server (no install)

Whisper runs a hosted MCP server at https://mcp.whisper.security. Point any MCP client that supports remote servers at it and authenticate with your API key:

{
  "mcpServers": {
    "whisper": {
      "url": "https://mcp.whisper.security",
      "headers": { "Authorization": "Bearer <your_api_key>" }
    }
  }
}

Claude Desktop / Claude Code / Cursor (stdio)

For local stdio transport, add this to your MCP client config:

{
  "mcpServers": {
    "whisper-graph": {
      "command": "npx",
      "args": ["-y", "@whisper-security/whisper-graph-mcp"],
      "env": { "WHISPER_API_KEY": "your-api-key" }
    }
  }
}

Or with Claude Code:

claude mcp add whisper-graph -e WHISPER_API_KEY=your-api-key -- npx -y @whisper-security/whisper-graph-mcp

Self-hosting this repo is for teams who want to run the MCP layer in their own environment. See How to set up.

Agent quickstart

Get a working API key in two HTTP calls — no browser, no CAPTCHA, no waiting list.

Step 1 — start signup (Whisper emails a verification code):

POST https://console.whisper.security/api/signup
Content-Type: application/json

{"email":"your-agent@example.com","attribution":{"agent_name":"your-agent","source":"<registry-name>"}}

Step 2 — verify with the emailed code:

POST https://console.whisper.security/api/signup/verify
Content-Type: application/json

{"signup_id":"...","code":"..."}

The response contains api_key, mcp_url, dashboard_url, and docs_url. Use api_key in the MCP config snippet above. Full docs: whisper.security/docs/agent-signup.

Tools

All six tools are read-only.

Tool	What it does
query	Execute a Cypher query against WhisperGraph. Validated against a safety rule set before it reaches the backend.
list_labels	List every node label with counts. Call it before writing a query when you're unsure which label to anchor on.
describe_label	Confirm a label exists and enumerate its property keys.
explain_indicator	Threat assessment for an IP, hostname, CIDR, or ASN — score, level, factors, sources.
whisper_history	Historical WHOIS or BGP data for an indicator.
domain_variants	Typosquatting / brand-protection variants of a domain, checked against the graph.

Resources

Six MCP resources: the full schema, the relationship map, a Cypher function reference, a query cookbook, plus live whisper://stats and whisper://quota.

Prompts

Eight investigation-workflow prompt templates: investigate-ip, map-attack-surface, compare-domains, blast-radius, threat-triage, whois-pivot, bgp-investigation, typosquat-sweep.

Self-hosting (Docker / HTTP)

For remote or team deployments, run the server over Streamable HTTP:

docker run -p 8080:8080 -e MCP_TRANSPORT=http \
  ghcr.io/whisper-sec/whisper-graph-mcp:latest

Or with Docker Compose:

docker compose up

In HTTP mode the server does not authenticate inbound requests — it relays the caller's X-API-Key or Authorization: Bearer header to the hosted WhisperGraph API, falling back to the WHISPER_API_KEY environment variable when no header is present. Put it behind your own gateway if you need access control.

Configuration

All configuration is via environment variables.

Variable	Default	Description
WHISPER_API_KEY	(none)	Your WhisperGraph API key. Get one programmatically in 2 HTTP calls or via the dashboard.
MCP_TRANSPORT	stdio	stdio for local CLI use, http for remote/Docker.
HTTP_HOST	0.0.0.0	Bind host for the HTTP transport.
HTTP_PORT	8080	Bind port for the HTTP transport.
WHISPER_ALLOWED_HOSTS	(none)	Comma-separated Host header allowlist for DNS-rebinding protection in HTTP mode. Leave empty only behind a trusted gateway.
WHISPER_DB_URL	https://graph.whisper.security	Base URL of the hosted WhisperGraph API.
WHISPER_QUERY_TIMEOUT_MS	60000	Hard per-query deadline forwarded to the API.
WHISPER_DB_TIMEOUT_MS	10000	HTTP timeout for non-query calls.
LOG_LEVEL	info	debug, info, warn, or error.

Development

npm install
npm run dev       # run from source over stdio
npm test          # unit + integration tests (no secrets needed)
npm run build     # bundle to dist/
npm run lint      # eslint
npm run typecheck # tsc --noEmit

Contributing

Contributions are welcome. See CONTRIBUTING.md and our Code of Conduct. Security issues: see SECURITY.md.

License

Apache-2.0. "Whisper", the Whisper logo, and "WhisperGraph" are trademarks of Whisper Security — see NOTICE.