Data & enrichment: coverage, accuracy and cost

Why it matters

Data quality and finding leads are recurring problems in the club. Bad data wastes sends, hurts deliverability and skews every downstream metric.

What practitioners should know

1. 01

   Coverage varies by segment

   A provider that is strong in one region or company size can be weak in another, which is why waterfalls exist.

2. 02

   Verify every email

   Found emails still need verification; catch-all domains need extra care before they go into a sequence.

3. 03

   Data decays

   People change jobs and companies change domains, so records need refreshing on a schedule rather than once.

4. 04

   Pay per result

   Teams increasingly prefer pricing that charges only for verified hits over flat seat licenses.

Worth reading

• B2B Data Enrichment Accuracy 2026: Our 500-Lead Benchmark + Every Published Test | Cleanlist

  Vendor benchmark running 500 real B2B leads through a multi-provider waterfall and through single-source databases on identical input.

  cleanlist.ai

• The State of B2B Data in 2026: Enrichment Benchmark Report | Cleanlist

  Report on 2026 B2B data quality covering decay rates, single-source versus waterfall match rates and the cost of bad data.

  cleanlist.ai

• The Complete Guide to Waterfall Enrichment (2026) | Clay

  Clay's guide to sequencing data providers, explaining that coverage stays similar across provider orders while cost varies with where premium sources sit.

  clay.com

• Waterfall Enrichment Explained: Provider Sequencing, Email and Phone Verification, and Build-Versus-Buy Economics

  Explains waterfall enrichment mechanics, verification steps (syntax, MX, SMTP, catch-all) and the economics of building versus buying.

  explorium.ai

• B2B Contact Data Decay Report 2026: Decay Rates by Field, Role, Seniority and Industry

  Breaks down contact data decay by field, showing emails decay much faster than phone numbers within the same database.

  datamagnet.co

Research gathered Sep 29.

Questions to be able to answer

• What share of your found emails are catch-all, and how do you handle them?
• How often do you refresh contact data already in your CRM?

Public threads on this

• I quit my job to vibe code a GTM automation tool from scratch, and made ~$10K 🚀 Here’s what I learned👇r/gtmengineering
• How much of your outbound workflow is still manual?r/gtmengineering
• The GTMEngineer debate is arguing about the wrong layerr/gtmengineering