Underwritefrom the source
When a million dollars moves on your word, every fact needs a receipt. Quoin turns official records into cited answers inside Claude — minutes, not days.
"When did 1801 K Street NW last sell?"
Reported sale · January 14, 2015. Consideration · $445,000,000.
Tax System Property Sales (CAMA)
Record 473583123 · SSL 0107-0075 · Washington, DC
- its source,
- its dates,
- a route to verify ↗
No customer logos yet — we'd rather show you the product's own output. Pick a property you know and check our receipts against the record.
Ask in plain language
Every fact cited.
Nothing guessed.
Built for the people who sign — investors, underwriters, brokers, and analysts working deals in DC, Maryland, and Virginia.
One question. Not four websites.
Owner and sale context lives with the assessor. Taxes with the revenue office. Deeds at the recorder. Permits with the building department. It's all public record — scattered across agencies, one login at a time. Quoin resolves it around the official property account, in one answer.
Claude is brilliant. It isn't a data source.
You've already asked an AI about a property. You couldn't forward the answer — nothing was behind it. Quoin plugs real records in: every material fact arrives with its source, its effective date, and the exact route to verify it. Not a guess dressed up as an answer.
Every fact wears its receipt.
Source, effective period, retrieval date, and the official route to verify — attached to every material fact. Forward the answer to a partner, a lender, a client: the proof travels with it.
Honest data, by design.
Dated facts. No fuzzy matching — records link to the official property account or they're labeled as context. Empty results stay empty instead of becoming guesses. Read-only, always.
Three steps.
Zero new tabs.
1claude.ai → Settings2 → Connectors3 → Add "Quoin Data"45✓ Connected · read-only
National by
design.
Quoin goes jurisdiction by jurisdiction, at full depth — taxes, assessments, deeds, permits, licenses, enforcement — starting with DC, Maryland, and Virginia. Name your market when you request access; demand sets the expansion order.
Every fact traces back
to one of these.
Aggregators go stale because properties change hands faster than their refresh cycles. The custodians of record don't. Quoin reads them directly and keeps the link — so you can check any fact yourself.
Trust is
non-negotiable.
A provenance product has to earn trust structurally, not with a badge. What you research, and for whom, stays your business — and every claim here is checkable in the product itself.
Read-only, always
Fifteen tools, zero writes. Your research can't touch the record — and neither can we.
Your questions stay yours
No conversation content collected. Analytics exclude your questions, your documents, and the records you retrieve.
Honest nulls
Missing records are reported as missing — never padded, never improvised into an answer.
Scoped, not fuzzy
Records link to the official property account or they're labeled as context — exact, shared building, multi-parcel, or proximity.
Two prices.
No decoder ring.
The records are free — one agency site at a time. What you're buying back is the leg work, with a receipt on every fact.
Individual
For the person who signs the memo
- Full connector access inside Claude
- All record families, every live jurisdiction
- Every material fact source-linked and dated
- One 7-day trial — no card required
- Month to month · cancel in the billing portal
- No conversation content collected
API
The same receipts, as JSON — access by request
- $0.05 per property lookup, billed monthly on usage
- $0.04 over 10k/mo · $0.03 over 50k/mo
- Custom beyond 250k/mo — SLA, jurisdiction priority
- No monthly minimum, no commitment
- Same provenance schema as the connector
- Read-only OAuth
If it saves hours on one deal, it's paid for itself. Month to month — cancel from the billing portal, no phone call, no retention script.
Verify it on
a real property.
Pick a property you know and ask. If the receipts don't hold up, walk away — nothing to unwind.
If you never add a card, access simply pauses — nothing to cancel, nothing to dispute.