drumlin.dev

Honest, verifiable tooling for people who check their bills.

Automation you can audit. Runs are reported as a receipt — inputs read, records resolved, records skipped, and units billed — so the work and the invoice can be compared line by line.

Tools

Treewalk

Bulk email-authentication auditor — SPF/DKIM/DMARC posture against Gmail/Outlook bulk-sender rules, resolved per RFC 9989.

liveFree (for now)email authSPF/DKIM/DMARCdeliverability

Contact Receipt

Emails and phone numbers from the URLs you supply — with a receipt that reconciles what was delivered against what was billed.

How it works

Crawls only the URLs the buyer submits and extracts emails, phone numbers and social profiles. Every submitted URL is accounted for in the run's own output — fetched, refused, failed or duplicate — and a BILLING_RECEIPT reconciles delivered contacts against billed events. A refused-host denylist is enforced before any fetch and re-checked at every redirect hop.

live$0.004 per contact deliveredcontact extractionbilling receiptcrawler