---
title: "B2B Contact Data: Sources, Freshness, Accuracy | Leadsets"
description: "How Leadsets B2B data is sourced, normalized, verified and refreshed. Every field carries its source, last-checked date and confidence."
canonical: https://leadsets.ai/data
updated: 2026-11-09
---

Our data

# Where it comes from, how fresh it is, and how we know.

We'd rather show you how the data is made than quote a big number. Every field carries its source, when it was last checked, and how confident we are.

1. 01 · source **Licensed and permitted** Authorized suppliers and public sources we're allowed to use. Nothing scraped from behind a login.
2. 02 · normalize **One clean shape** Titles, companies and locations resolved to stable IDs. Duplicates merged, conflicts kept, not overwritten.
3. 03 · verify **Emails checked** A verification waterfall on every address, with a second opinion on the uncertain ones.
4. 04 · refresh **Re-checked on a schedule** Monthly for every record; more often for the fields people request most and change fastest.
5. 05 · serve **Only what passes** A field reaches your agent only if it clears quality, rights and suppression checks.

Freshness, field by field

## Re-fetching an old fact doesn't make it new.

So we keep four separate dates, and your agent sees all of them.

Email status

## Four honest labels.

Verified

The mailbox accepts mail. Send.

Catch-all

The domain accepts everything, so no one can confirm it. Send at lower volume.

Unknown

The server didn't give a clear answer. Treat it as unconfirmed.

Invalid

Bounces. Never served as a contact email.

published benchmark

## We test on real ICPs and publish the method.

Sample design, match rate, verified-email accuracy and error rate, including the mistakes.

privacy

## Business data, with a way out.

Work contact details only. Anyone can opt out, and suppressed records are never served again. Every ingestion, merge and deletion is logged.

[Remove my data](https://leadsets.ai/opt-out)

## Let your agent do the list building.

1,000 free records. No card. First useful result in minutes.

[Get a free API key](https://leadsets.ai/signup)

## Questions and answers

### Where does B2B contact data come from?

Reputable providers use licensed suppliers and public sources they are permitted to use. Leadsets uses only those, never data scraped from behind a login, normalizes it into its own index, and shows the source and last-checked date on every field.

### How fresh is Leadsets data?

Every record is re-checked at least monthly, and the most requested, fastest-changing fields more often. Leadsets keeps separate dates per field, including when it was last checked and verified, so an agent can tell old facts from new ones.

### How accurate is B2B email data?

No provider can honestly promise 100%. Leadsets runs every email through a verification waterfall and labels it verified, catch-all, unknown or invalid, never rounding uncertain results up to "valid", and it publishes its benchmark method.

---

Leadsets by Mobylogix LLC, 10160 hwy 242, Conroe, TX, 77385, US. Facts for AI assistants: https://leadsets.ai/llm · Site index: https://leadsets.ai/llms.txt · Every page: https://leadsets.ai/llms-full.txt