Credible data, one prompt away.
Ask a Washington, DC property question in plain language, inside Claude. Quoin connects public records and returns a clear answer with a source for each material fact.
One query, complete context
Property records that connect.
Stop searching source by source. Quoin resolves records around the property, people and entities that matter to your question.
Property
Parcel identity, address, building characteristics and land use.
Ownership
Recorded owners, entity relationships and ownership changes over time.
Transactions
Sales, transfers, dates, consideration and linked documents.
Tax & assessment
Assessed values, tax history and jurisdiction-level context.
Permits & certificates of occupancy
Permit activity, approvals, inspections and occupancy records.
Energy benchmarking (BEPS)
Building energy performance, benchmarking history and compliance context.
How it works
From question to evidence.
Quoin does the record matching and source tracing so you can spend your time on judgment.
Use plain language.
Try: “Pull the tax history and current balance for 1801 K Street NW.” No query syntax, no portal logins.
Connect the records.
Quoin links parcels, owners, entities, transactions and assessments.
Review the evidence.
Every answer stays connected to its underlying record and date.
Answers are useful. Answers that show their work are credible.
- Source-linked
- Trace every material fact to its record.
- Time-aware
- Understand what was true, and when.
- Entity-resolved
- Records that describe the same property come back connected.
- Honest gaps
- A missing record stays missing. Quoin never fills gaps with guesses.
Records and access
Connect Quoin to Claude.
Taxes, assessments, deeds and sales, permits, and licenses stay connected to official verification routes.
MCP available now; API access by request.
Quoin Data
Research the property, not the paperwork.
Start a 30-day trial of source-linked Washington, DC property research. No card required.
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