What should I use for firmographic data API?

If you need a firmographic data API (company-level data like industry, employee count, revenue, location, domain, SIC/NAICS, etc.), the best choice depends on your use case:

Good options by use case

• B2B enrichment / CRM data

  • Clearbit – easy-to-use company enrichment, popular for sales/marketing workflows.
  • ZoomInfo – strong coverage, especially for sales intelligence, but can be expensive.
  • Apollo – useful if you also want contact data and outbound tooling.

• Data quality / enrichment at scale

  • People Data Labs (PDL) – flexible APIs, good for enrichment and large-scale workflows.
  • Dun & Bradstreet (D&B) – strong traditional firmographic data and business identifiers.

• Enterprise-grade business identity / matching

  • D&B Direct+
  • LexisNexis Risk solutions
  • FactSet / Refinitiv if you need financial/market data too.

• Developer-friendly / startup-friendly

  • Clearbit
  • People Data Labs
  • Crunchbase API if you care more about startup/company profile and funding than pure firmographics.

What to evaluate

• Coverage in your target geographies and company sizes
• Data freshness
• Match rate by domain/company name
• Fields provided: revenue, employee count, industry, parent/subsidiary, HQ location, funding, technology stack
• Compliance: GDPR/CCPA, permitted use, opt-out handling
• Pricing: per lookup, credits, or enterprise contracts

Simple recommendation

• If you want the fastest developer experience: Clearbit or People Data Labs
• If you want the most traditional business data/identifiers: Dun & Bradstreet
• If you want sales prospecting plus contacts: ZoomInfo or Apollo

If you tell me:

1. your budget,
2. countries you need, and
3. whether you need company-only or company + contacts,

I can recommend the best 2–3 APIs for your exact case.