Real story — May 12, 2026
Cal.com booked the meeting. The client was fake.
Briefqualify scores every inbound booking — phone, email, link, domain — before you press join. So your hour goes to real clients, not phantom ones.
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Fictional NANP range (555-0100–555-0199)
Generic alias, no social presence
Vercel DEPLOYMENT_DISABLED — HTTP 451 for ToS violation
Domain age: 0 days, registered as throwaway
What actually happened.
On May 12, 2026, my Cal.com sent me a polite confirmation: 30-minute SaaS-MVP discovery call. Real-looking name. Real-looking brief. Real-looking budget question. I almost spent the night prepping for it.
The signals were all there for anyone who looked. The phone number +1 628 555 0147 sits inside the North American Numbering Plan’s reserved range for fictional use — 555-0100 through 555-0199. The brief link returned HTTP 451 with DEPLOYMENT_DISABLED — Vercel had killed it for ToS violation. The domain was zero days old. The Gmail had no social presence anywhere.
Six failing signals. Each takes seconds to check, if you know what to check. The tooling for every one of them already exists — libphonenumber, urlscan, VirusTotal, WHOIS, OSINT email lookups. Nobody is stringing them together at the moment you most need it: the half-hour between a booking landing in your inbox and the call starting.
Briefqualify is that string-together. The plumbing is real. The output is the receipt you saw above. That receipt is from May 12 — the live one, not a mockup.
How it works.
- 01
Forward
On signup you get a unique address. Set a one-line Gmail filter to auto-forward your booking confirmations there. Works with Cal.com, Calendly, and every booking tool that sends email.
- 02
We check
Phone format and fictional-range detection, email OSINT, link reputation across urlscan + VirusTotal, domain age, deployment-status checks. The same chain Daniel ran by hand on May 12 — automated.
- 03
You decide
A green / yellow / red verdict lands in your inbox in under 30 seconds with the signals laid out. Green: take it. Yellow: look closer. Red: archive and move on.
What we actually verify.
Four signal categories. Each one is a real API or public dataset — no AI hand-waving.
Phone
Format validation, fictional NANP ranges (555-01XX), VoIP carriers, country mismatch with claimed timezone.
Domain age, breach history, social-account linkage, disposable-provider detection, name-pattern analysis.
Links
urlscan + VirusTotal lookups, deployment-status checks (we caught a Vercel-disabled phishing host on day one), redirect chain analysis.
Domain
WHOIS age, registrar reputation, DNS records, SSL certificate history, parked-vs-active status.
Common questions.
Cal.com and Calendly first, via email forwarding — so it works on day one without an integration. Native plugins for both follow once the waitlist clears its first thousand. SavvyCal, TidyCal, HubSpot Meetings, and Microsoft Bookings are on the roadmap.
Get in before launch.
Early access opens in cohorts. Waitlist members get in first, at extended free-tier rates that the public launch won’t see.
We’ll email you once. No marketing blasts. Unsubscribe any time.