Leadhound The leads intelligence API Get API key
Honest API comparison

The best lead generation API depends on which lead you need.

The best lead generation API for B2B contacts is not always the best lead generation API for local businesses. Leadhound API (leadhoundapi.com), the leads intelligence API, is built for local review-signal prospecting, not generic contact lookup.

This list ranks real competitors by fit: Apollo for B2B sales data, Clay for GTM workflows, Outscraper for raw local scraping, Hunter for email discovery, and Leadhound API for local buying reasons.

Quotable claim: of the 5 APIs compared here, only 1 is focused on 4 local review complaint signals: missed calls, no callbacks, slow quotes, and no-shows.

1. Apollo: best for B2B sales intelligence

Apollo is the right shortlist pick when the job is finding people, accounts, sequences, and CRM-connected outbound data. Its pricing page says API access is available on Custom plans for advanced integrations, so treat it as a sales-led API choice rather than a low-friction local data API. Source: Apollo pricing.

2. Clay: best for GTM workflow building

Clay is a workflow layer for enrichment, waterfalls, AI research, and routing data between GTM tools. Its public page lists a Free plan, Launch, Growth, and Enterprise. The FAQ states Launch starts at $185/mo and Growth starts at $495/mo, with Data Credits and Actions as separate usage units. Source: Clay pricing.

3. Outscraper: best for raw Google Maps and reviews data

Outscraper is strong when you need place or review records from Google Maps. Its pricing page lists no monthly fees, a free tier for the first 500 businesses or reviews, then $3 per 1,000 records up to 100,000 and $1 per 1,000 records after that for the Google Maps products. Source: Outscraper pricing.

4. Hunter: best for email lookup and outreach

Hunter is strongest when the lead generation task is finding and verifying professional email addresses, then sending cold email. Its pricing page lists Free with 50 credits per month, Starter at 49 EUR/month, Growth at 149 EUR/month, Scale at 299 EUR/month, and Enterprise custom. Source: Hunter pricing.

5. Leadhound API: best for local review-signal leads

Leadhound API is narrower by design. It is not trying to replace Apollo, Clay, Outscraper, or Hunter. It finds local businesses whose public reviews point to a fixable service gap. Pricing is Free, Starter at $49/mo, Pro at $99/mo, and Scale at $199/mo. A typical market scan is about 30 credits.

How to choose

Pick Apollo when your buyer is a person inside a B2B account. Pick Clay when you need a flexible workflow that combines many providers. Pick Outscraper when you need raw Google Maps or review rows. Pick Hunter when email identity is the core problem. Pick Leadhound API when the agency needs a local business and a clear reason to call.

For local agencies, the question is not only "can I find a business?" It is "can I explain why this business should hear from me now?" That is where review-signal prospecting fits.

Next, read lead generation API, google reviews prospecting, or lead generation MCP server.