Assumptions
API pricing based on current Anthropic rates (Sonnet: $3/M input, $15/M output tokens). Average prompt ~500 tokens in, ~200 tokens out per email. Includes 10% retry rate for failed validations. n8n Cloud pricing at standard tier. Human review time estimated at 90 seconds per reviewed item, with 15% of items going to review. Self-hosted n8n would reduce costs further.