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Email Waterfall

Try multiple email providers in cost order, stop at the first valid hit. You only pay for the one that works. Industry benchmarks suggest this gets 20-40% more emails than using any single provider alone (Instantly).

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Pick Your Starting Point

Deepline automatically selects the right waterfall based on what data you have:
You haveWaterfall usedTypical cost
Name + company + domainname_and_company_to_email_waterfall0.3-0.4 credits
LinkedIn URL + nameperson_linkedin_to_email_waterfall0.3-0.4 credits
Name + domain (no company)cost_aware_first_name_and_domain_to_email_waterfall0.1-0.4 credits
Email (want context back)person_enrichment_from_email_waterfall0.2-0.3 credits
Company + role (find contacts)company_to_contact_by_role_waterfall0.2-0.6 credits

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How It Works

Each waterfall follows the same pattern:
1

Try cheapest provider first

Deepline sends the request to the lowest-cost provider (e.g., Dropleads at ~0.3 credits).
2

Validate the result

If the provider returns an email, Deepline checks it’s a real address — not a catch-all or bounce.
3

Fall through on miss

If the provider fails or returns invalid, Deepline moves to the next cheapest provider automatically.
4

Stop on first valid hit

The moment a valid email is found, the waterfall stops. You’re only billed for providers that ran.

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Single Lookup

Just ask Claude Code:
“Find the work email for the VP of Engineering at Ramp (ramp.com)“ 
deepline tools execute name_and_company_to_email_waterfall \
  --payload '{"first_name":"Jane","last_name":"Smith","company_name":"Ramp","domain":"ramp.com"}'

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Bulk Enrichment (CSV)

“Run waterfall email enrichment on leads.csv”
Deepline reads the column headers and picks the right waterfall variant. If your CSV has first_name, last_name, company_name, and domain — it uses the name+company waterfall. If it has linkedin_url — it uses the LinkedIn waterfall. 
deepline enrich --input leads.csv --output enriched.csv \
  --with '{"alias":"email","tool":"name_and_company_to_email_waterfall","payload":{"first_name":"{{first_name}}","last_name":"{{last_name}}","company_name":"{{company_name}}","domain":"{{domain}}"}}'

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Provider Order

Providers are tried in sequence. The exact chain depends on the waterfall variant, but a typical order:
  1. Dropleads (0.3 cr)
  2. Hunter (0.3 cr)
  3. LeadMagic (0.4 cr)
  4. Deepline Native (1.0 cr)
  5. Crustdata (1.2 cr)
  6. PeopleDataLabs (4.0 cr)
BYOK mode: If you bring your own API keys, waterfall lookups are free — you pay providers directly at their rates. In managed mode, a typical lookup costs 0.3-0.4 credits (first provider hit). Worst-case if all providers fire: up to 7.2 credits.

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Pilot Mode

Always test before running a full file:
“Run waterfall email enrichment on leads.csv — just the first 3 rows”
Or with the CLI: --rows 0:2

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When to Use Each Variant

  • Name + company + domain — Most common. Use when you have a lead list with company info.
  • LinkedIn URL — Use when scraping from LinkedIn or when LinkedIn is your primary identifier.
  • Name + domain only — Use when you don’t have the company name, just the website.
  • Email → context — Reverse enrichment. You have emails, you want person/company data back.
  • Company + role — Prospecting. Find contacts at target companies by job title.
See the auto-generated pages below for exact provider chains, parameters, and per-variant cost breakdowns.