WalterFetch: Building a Zero-Cost Lead Enrichment Engine

A complete product teardown of a 15-provider enrichment waterfall that achieves production-grade data quality at $0.00 marginal cost per lead. Covers the full architecture, free-first provider strategy, quality tiering system (GOLD/SILVER/BRONZE), local LLM integration, cost model with margin analysis, multi-tenant design, competitive positioning against ZoomInfo/Apollo/Clay, and honest limitations assessment.

Sample report demonstrating the Deep Dive tier. Full report is a downloadable Markdown file with architecture diagrams, cost tables, and technical decision analysis.