Best B2B Data Providers for Marketing Agencies in 2026
See the exact people visiting your website and Follow up with them.
Marketing agencies face unique data challenges: serving multiple clients across different industries while managing tight margins. This guide reviews the best B2B data providers for agencies and reveals why data ownership beats subscriptions for agency economics.
Why Agencies Need Different Data Solutions
Unlike single companies, agencies require:
- Multi-industry coverage for diverse clients
- Flexible data access without per-client fees
- Ability to resell or include data in services
- Cost structures that protect margins
Top B2B Data Providers for Agencies
1. HappierLeads - Best Overall for Agencies
HappierLeads' one-time purchase model is ideal for agencies:
- 175M+ contacts across all industries
- $4,999 one-time for complete global database
- No per-client or per-campaign fees
- Can be included in client deliverables
- Monthly updates keep data fresh
Agency ROI: Serve unlimited clients with one data investment.
2. ZoomInfo
Enterprise-grade but expensive for agencies at $20K-$50K/year. Per-seat pricing makes it costly as teams grow.
3. Apollo.io
Good for small agencies with limited needs. Credit limits can restrict client work.
4. Clearbit
Strong enrichment capabilities but API pricing can escalate quickly.
Agency Economics: Subscription vs One-Time
Consider an agency serving 10 clients:
- ZoomInfo: $30K/year = $250/client/month overhead
- Apollo: $200/month = $20/client/month overhead
- HappierLeads: $4,999 one-time = $42/client total (for year 1), $0 ongoing
The one-time model dramatically improves agency margins.
How Agencies Use Bulk Data
- Lead generation campaigns: Build targeted lists for each client
- ABM programs: Create account lists at scale
- Email marketing: Power outbound campaigns
- LinkedIn advertising: Upload matched audiences
- Market research: Analyze TAM for client pitches
Get Started
Ready to transform your agency's data economics? Buy our 175M Contact Database with a one-off payment. Serve unlimited clients with one investment.
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Website Identification FAQs
Does Happierleads have a Free trial?
What is Happierleads?
HappierLeads is the only solution that enables you to identify, qualify, and engage with your anonymous B2B website visitors—all within a single tool. No additional licenses or integrations with other outreach automation tools are necessary.
Who typically uses Happierleads?
Happierleads is used by Sales, Growth, and Marketing teams across various industries. If you are a B2B company, we are the solution for you. Sales teams use the platform to turn anonymous traffic into opportunities and increase productivity. While on the other hand, Marketers use the platform to automate lead generation, increase conversions.
How is this different from Clearbit, 6Sense, or DemandBase’s Website Identity Solutions?
Most companies rely on ‘Reverse IP Lookup’ technology to connect IP addresses with company names. At Happierleads, we use a completely different approach—our fully-permissioned, proprietary publisher network—allowing us to identify the exact individuals visiting your website. Discover more about how we identify your site visitors here.
Why is Happierleads ranked number #1 for data quality on G2 and Capterra?
Happierleads offers an advanced feature that automatically filters out bots, ISPs, and other non-qualifying traffic sources to ensure you receive only high-quality leads. Additionally, unlike other tools, Happierleads provides the flexibility for you to manually remove leads as needed.
What about U.S. state privacy laws, like the California CCPA and CPRA?
