Is crypto order book data free from the exchange APIs?
Updated
Is crypto order book data free from the exchange APIs?
Live data is free from every exchange’s public API, and if you only need the current book on one venue you do not need a vendor. What no exchange serves at any price is history: their endpoints return only recent data, so a deep, gap-free, cross-venue record has to be collected and kept the day it happens. That record, plus the computed columns, is what you pay for.
What is genuinely free
Every exchange gives away its live market data. Binance, Coinbase, Kraken and the rest all publish a public WebSocket for the current order book and the trade tape, and a REST endpoint for a depth snapshot. For a single venue, in real time, this is enough, and you should use it. BlackForge is not competing with the free live feed; it uses those same feeds.
What is not available at any price
History. An exchange REST endpoint returns a snapshot of the book now and the most recent trades, never the book as it stood last Tuesday. There is no historical order book endpoint on any major venue. If you want last month’s depth, you had to be recording last month. This one fact is why a paid market-data category exists at all.
BlackForge keeps every five-minute window forever, back to 14 July 2026, and reads never age out of the archive. That is the part the free feed cannot give you, because the free feed is a live stream, not a store.
Three things beyond history
Even for live data, the free feed leaves real work on your side of the line:
- Rate limits and reconnection. A single exchange WebSocket connection is valid for a limited time and is dropped if it misses a heartbeat, so continuous recording means reconnection logic, gap handling and re-seeding. Miss it and you have holes you cannot backfill.
- Sequencing. A correct local order book has to apply diff updates in strict sequence against a seed snapshot; a single skipped update silently desynchronises the book, and everything computed from it is then wrong while still looking valid.
- Cross-venue normalisation. Each venue names pairs differently, quotes in different assets and serves different depth. Making nine venues comparable, in one schema, in USD-normalised terms, is a project in itself. BlackForge does it once, the same way, for all 9.
Where the free feed wins
- Live, sub-second data for one venue, at zero cost, straight from the source.
- No vendor dependency, no plan, no rate on top of the exchange’s own.
- The raw stream, if you specifically need every tick rather than a five-minute measurement.
Choose the free exchange API if you only need current data on a single venue and never need to look back. Choose BlackForge the moment you need history, more than one venue compared, or the maintained book without building the pipeline.
Isn’t all this data available for free from the exchange’s APIs?
The live data is. Every exchange publishes a free public WebSocket and REST API for its current order book and trades. What is not free, and not available at any price from those APIs, is history: the endpoints return only recent data, so a deep, gap-free record has to be collected and stored the day it happens. BlackForge is that stored record, across nine venues, plus the computed columns.
Can I get historical order book data from an exchange API?
No. Exchange REST endpoints serve a current depth snapshot and recent trades, not a historical order book. To have last month’s book you must have been recording last month. This is the founding fact of every paid market-data vendor in the category.
What do I actually pay for, then?
Three things the free feed does not give you: history (kept forever, back to July 2026), the same measurements computed the same way across nine venues so they are comparable, and a maintained order book rather than a raw stream you have to reconstruct and keep in sync yourself.
Sources
- Tardis.dev, Show HN discussion on historical order book data: news.ycombinator.com/item?id=20463215
- Binance Spot API, managing a local order book and connection limits: developers.binance.com
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