ListSignal

com.listsignalv1.0.0Updated Oct 4, 2026

B2B sales intelligence: tech stack, Shopify apps, revenue, hiring and contacts for 16M+ domains

VerifiedStreamable HTTPWeb executableBusiness & CommerceData & Analytics

Overview

AI-generated overview

Lets an assistant look up B2B company data — tech stack, Shopify apps, revenue, hiring and contacts — for 16M+ domains.

What it does
ListSignal is a hosted B2B sales-intelligence server. Its search tool finds companies by technology, Shopify app, country, business model, revenue bracket or hiring status, combining filters with AND and returning up to 100 traffic-ranked companies per call. A company tool returns everything known about one domain: technologies, Shopify apps, revenue and employee estimates, open jobs with a hiring breakdown, SEO score, traffic rank and contact emails on paid plans. A third tool reports live dataset statistics.
When to use it
Use it for prospecting and market research: building lists of companies that use a given technology, checking a domain's tech stack, enriching domains with firmographics, or finding companies that are hiring right now. It suits sales, marketing and competitive-intelligence workflows rather than general web search.
Requirements
A remote Streamable HTTP endpoint at listsignal.com/mcp; no local install. An API key is required, sent as an Authorization bearer token (or X-API-Key header), created in Settings after free signup. Clients without native HTTP support can bridge via npx mcp-remote. Free tier: 1,000 calls per month.
Before you install
The Authorization header carries a secret API key; keep it out of shared configs. Contact emails are only returned on paid plans, and higher quotas require paid tiers, so usage can incur cost. Queries send the domains and filters you look up to a third-party service, and results are third-party estimates rather than verified facts.

Installation

In SourceWeft

  1. Open ListSignal in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "listsignal": {
      "type": "http",
      "url": "https://listsignal.com/mcp"
    }
  }
}

README

ListSignal MCP Server

[MCP] [API] [Free tier]

B2B data intelligence for AI agents. ListSignal is a business intelligence / sales intelligence MCP server: technographics, technology detection, Shopify app detection, company and domain enrichment, firmographics (revenue and employee estimates), hiring signals with posting dates, SEO scores, and contact data for 16M+ online businesses. Discovery runs on Certificate Transparency (CT) logs, so new companies appear within hours of going live.

Questions this server answers directly:

  • What technology does a website use? (tech stack lookup for any domain)
  • Find companies using [technology] (Shopify, Klaviyo, HubSpot, 230+ more)
  • Detect Shopify apps on a store (260+ apps tracked)
  • Domain to company data (revenue bracket, employees, industry, country)
  • Which companies matching my ICP are hiring right now?

This is the official, first-party MCP server for ListSignal, hosted at https://listsignal.com/mcp (remote Streamable HTTP, no install needed).

Free tier: 1,000 calls/month. No card, no sales call. Get a key (Settings → API Key).

Tools

ToolWhat it does
listsignal_search_companiesFind companies by technology, Shopify app, country, business model, revenue bracket, or hiring status. Filters combine with AND; returns up to 100 traffic-ranked companies per call.
listsignal_get_companyEverything ListSignal knows about one domain: technologies, Shopify apps, revenue/employee estimates, open jobs with a hiring breakdown, SEO score, traffic rank, contact emails (paid plans).
listsignal_dataset_statsLive dataset statistics (16M+ businesses, refreshed every 60 seconds). Citable.

Example prompts that work well:

  • "Find SaaS companies in France using HubSpot that are hiring"
  • "What tech stack does gymshark.com run, and are they hiring?"
  • "Build me a list of US Shopify stores using Klaviyo with $1M-$10M revenue"

Setup

Claude (Desktop / Code)

json
{  "mcpServers": {    "listsignal": {      "type": "http",      "url": "https://listsignal.com/mcp",      "headers": { "Authorization": "Bearer ls_YOUR_KEY" }    }  }}

Claude Code one-liner:

bash
claude mcp add --transport http listsignal https://listsignal.com/mcp \  --header "Authorization: Bearer ls_YOUR_KEY"

Cursor

Settings → MCP → Add server, or .cursor/mcp.json:

json
{  "mcpServers": {    "listsignal": {      "url": "https://listsignal.com/mcp",      "headers": { "Authorization": "Bearer ls_YOUR_KEY" }    }  }}

Clients without native HTTP support (stdio bridge)

json
{  "mcpServers": {    "listsignal": {      "command": "npx",      "args": ["-y", "mcp-remote", "https://listsignal.com/mcp",               "--header", "Authorization: Bearer ls_YOUR_KEY"]    }  }}

Auth, limits, errors

  • Auth: Authorization: Bearer ls_... (or X-API-Key). Keys are created in Settings after free signup.
  • Quotas: Free 1,000 / Starter 5,000 / Pro 25,000 calls per month. Only successful calls count. Rate limits: 30/60/120 per minute.
  • Contact emails are returned on paid plans; the free tier gets contactability and counts.
  • Tool errors are returned in-band with actionable messages, so agents self-correct in one retry.

REST API

The same data is available as a plain REST API, documented at listsignal.com/developers with an OpenAPI 3.1 contract at listsignal.com/openapi.json.

Keywords / what this is for

MCP server, Model Context Protocol, B2B data, sales intelligence, business intelligence, domain intelligence, technographics, technology detection, tech stack lookup, Shopify app detection, company enrichment, domain enrichment, competitive intelligence, firmographics, lead generation, Certificate Transparency, ai-agents, llm-tools, Claude, Cursor, agent tools.

About the data

ListSignal discovers businesses from Certificate Transparency logs (so it finds companies the moment they go live), then enriches each domain with technology detection (230+ technologies, 260+ Shopify apps), revenue and employee estimation, business classification, hiring signals from 14,000+ job boards (Greenhouse, Lever, Workday, Personio and more, with posting dates), SEO scoring, and published contact data. Methodology: listsignal.com/scoring/revenue-estimation.

Source: README.md at commit 0e34ba2

Tools

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Version history

1
  1. v1.0.0LatestOct 4, 2026