> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.dealsignal.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.dealsignal.com/_mcp/server.

# Welcome to Dealsignal

> Enrich, refresh, and validate contact and company data at scale.

DealSignal provides fresh, accurate, verified B2B data so sales and marketing teams can target the right buyers, personalize outreach, and increase deliverability.

This site has three sections:

#### [Documentation](/documentation/lead-enrichment/overview)

Concepts, flows, and quickstarts for each product area.

#### [API Reference](/api-reference)

Every endpoint with request/response schemas and live examples.

#### [What's New](/whats-new)

Recently shipped endpoints and breaking-change notes.

---

## Base URL

```
https://app.dealsignal.com
```

## Authentication in one line

Every request except the key-roll endpoint takes your `api_key` as a query parameter:

```bash
curl "https://app.dealsignal.com/api/v1/users/credit_metrics?api_key=YOUR_API_KEY"
```

For details on rotation, grace windows, and the `POST /api/v1/auth/api_keys/roll` endpoint, see **[Authentication](/documentation/get-started/authentication)**.

---

## Product areas

#### [Lead Enrichment](/documentation/lead-enrichment/overview)

Submit a bulk list of contacts; receive verified emails, phones, titles, company data.

#### [Contact Profile Refresh Requests](/documentation/contact-profile-refresh-requests/overview)

Refresh individual profiles on demand. By default every profile comes back inline with the contact matched so far; poll for the refreshed results.

#### [Credits](/documentation/credits/overview)

Check your credit balance and usage before launching jobs.