FAQ ( 001 )
Frequently asked questions
The short answers. For the full method — sources, matching, the delisting window, how accuracy is measured — see the methodology.
What is blipton?
blipton is a daily index of the listing status of all 4,905,892 residential addresses in New South Wales, Australia. The full index is queryable via the REST API, and the daily CSV lists every address currently on the market.
How often is the data updated?
Market status is refreshed every day. The address register itself is refreshed quarterly, matching the G-NAF release cycle.
How many properties are for sale in NSW at any time?
Roughly 51,000 — about 1.1% of the 4,905,892 residential addresses blipton tracks. The exact live count is published on the blipton dashboard and API each day.
How accurate is the listing status?
blipton reports recall (of the properties genuinely on the market, how many were caught) and precision (of the properties flagged, how many really are listed), measured only on the on-market class. A single "accuracy" percentage is deliberately not quoted: because only ~1.1% of addresses are on the market, a system that labelled every address not listed would score 98.9% accuracy while finding nothing.
Where does the address data come from?
The Geocoded National Address File (G-NAF), Australia’s authoritative address register, published by Geoscape Australia and licensed under the Open G-NAF End User Licence Agreement. blipton loads the complete NSW set and collapses alias records onto their principal address.
How are delistings detected?
A property is marked delisted only after it has been absent from the public listing surface for 3 consecutive daily runs. This confirmation window prevents listings that briefly drop out and return from flipping the data back and forth.
Does blipton include prices, photos or listing descriptions?
No. blipton publishes facts, not content: an address, a suburb, a postcode, a listing status, and dates. No photographs, prices, descriptions, agent details or third-party listing identifiers are collected or resold.
Is there an API?
Yes — a token-authenticated REST API for per-address status lookups, suburb sweeps and fuzzy address matching, priced at A$0.02 per metered lookup (incl. GST). Every new account starts with $2 of free credit — 100 calls, no card required. Daily on-market CSVs are available per suburb (A$99/month) or statewide (A$2,200/month). Full reference at /developers.
Which areas does blipton cover?
All of New South Wales today — metro and regional, 4,905,892 residential addresses. Victoria, Queensland and other states are planned before 2027 on the same schema.