UK company data and live business signals, by API

The Companies API finds and looks up any UK company. The Signals API tells you when one changes: new lending, new directors, new owners, an office move, or the first sign of trouble. Start free with 100 records, no card needed.

Two APIs, one key

Plans

Prices exclude VAT, which is added at checkout. The Business website plan includes 2,000 API records a month.

Quickstart

Create a key on your account API page, then send it in the Authorization header.

curl -H "Authorization: Bearer nh_your_key_here" \
  "https://www.newcohunter.co.uk/api/v1/signals/events?families=scaling&location=M,LS&limit=20"

Each event looks like this:

{
  "id": 48213377,
  "type": "charge_registered",
  "label": "New secured lending",
  "families": ["scaling"],
  "date": "2026-09-29",
  "detected_at": "2026-09-30T08:14:02.000Z",
  "summary": "New charge registered",
  "company": {
    "number": "12345678",
    "name": "EXAMPLE TRADING LTD",
    "status": "active",
    "locality": "Manchester",
    "postcode": "M1 1AA",
    "sic_codes": ["47110"]
  }
}

Endpoints

Signal webhooks

On the Signals API, add up to 5 webhooks from your account page or with POST /api/v1/signals/webhooks(body: url, optional families, types and location). Every few minutes we POST new signals matching the filter to your HTTPS endpoint as { type: "signals", events: [...] }, in the same shape as the events feed. Each signal delivered uses one record. Answer with any 2xx; failed deliveries are retried with backoff and the webhook is switched off after 20 failures in a row.

Verify each delivery with your webhook secret:

// Node.js
import { createHmac, timingSafeEqual } from "node:crypto";

function verify(req, rawBody, secret) {
  const ts = req.headers["x-newcohunter-timestamp"];
  const sig = req.headers["x-newcohunter-signature"];
  const expected = "sha256=" + createHmac("sha256", secret).update(ts + "." + rawBody).digest("hex");
  const fresh = Math.abs(Date.now() / 1000 - Number(ts)) < 300;
  return fresh && sig.length === expected.length && timingSafeEqual(Buffer.from(sig), Buffer.from(expected));
}

Use it from AI assistants (MCP)

Both APIs are also available as an MCP server, so AI assistants such as Claude can search companies, read signal feeds and find likely buyers for you. It uses the same key, the same plan and the same record allowance as the REST API.

Claude Code:

claude mcp add --transport http newcohunter https://www.newcohunter.co.uk/mcp \
  --header "Authorization: Bearer nh_your_key_here"

Other MCP clients (Streamable HTTP):

{
  "mcpServers": {
    "newcohunter": {
      "type": "http",
      "url": "https://www.newcohunter.co.uk/mcp",
      "headers": { "Authorization": "Bearer nh_your_key_here" }
    }
  }
}

Tools: search_companies, get_company, get_saved_search_matches, get_signal_events, get_company_timeline, find_likely_buyers, list_signal_types, list_offerings and get_usage. Up to 50 records per tool call.

Signal families and types

Combine families and types freely, for example families=failing&types=director_resigned.

Records, limits and headers

Frequently asked questions

Use of the API is covered by the API terms. Looking for alerts instead of code? See email alerts.