n8n Lead Enrichment Workflow: Firecrawl + Hunter + Gmail

Automatically enrich leads in Google Sheets—scrape with Firecrawl, verify emails with Hunter, and send outreach via Gmail

This n8n Lead Enrichment Workflow (Firecrawl + Hunter + Gmail) runs on a schedule (every 30 minutes) or manually to turn “pending” Google Sheets rows into verified decision-maker contacts—complete with grounded company research and a generated cold opener—then emails the lead through Gmail.

What this workflow does

• Scheduled lead processing: Every 30 minutes (or via manual trigger), it loads configuration values and reads “pending” rows from your Google Sheets lead table.
• Batch + credit budget controls: It caps work to a configurable batch size, skips rows missing a company, and tracks a per-run credit budget to stop further enrichment when limits are reached.
• Find the company domain + scrape sources: It determines the company domain from the row’s website field or by searching with Firecrawl, then scrapes the homepage and (when found) an About/Team page to build a research context.
• LLM extraction with grounded verification: Using OpenRouter, it extracts company intelligence and an ICP fit score from the scraped text, and removes any facts whose quotes do not appear verbatim in the source content.
• Decision-maker sourcing (if missing): If the contact is missing, it uses Hunter domain search to select a decision-maker based on your target titles/departments and carries forward any on-domain email returned.
• Email waterfall + deliverability checks: It runs an email waterfall—first using a website-discovered address, then Hunter Email Finder, then Dropcontact enrichment—verifying candidates with Hunter Email Verifier until it finds a deliverable, qualified accept-all email or the budget gates halt further attempts.

Use cases

• SaaS teams enriching inbound or outbound lead lists in Google Sheets without manual research.
• Automation engineers building repeatable n8n lead enrichment pipelines with source-grounded messaging.
• Sales ops standardizing contact discovery using Hunter verification and outreach via Gmail.

Technical details

• Workflow orchestration: n8n nodes including if, set, code, no op, and gmail.
• Enrichment services: Firecrawl for scraping/search, OpenRouter for grounded extraction, and Hunter (domain search, Email Finder, Email Verifier) with Dropcontact in the waterfall.