Curriculum·S209 The Centralized Exchange in Depth·about 32 min
The full order type inventory
By the end of this lesson you can
- →Classify every order type by the two variables it fixes and the one it leaves open
- →Predict how each order type behaves when depth collapses, rather than in normal conditions
- →Choose the flags that change an order's meaning, and name what each one prevents
- →Select an order type from a stated objective rather than from habit
Sophomore · enrolled learners
This lesson opens with When the book went to 2 percent.
- What happened
- During the deleveraging event of 10 October 2025, order-book data on the Binance pairs measured showed depth collapsing by around 98 percent as market makers withdrew. On Binance's USDE/USDT pair, Rena Labs data published by Cointelegraph Research showed total book liquidity falling from an average of about $89M to about $2M in roughly a quarter of an hour; Coinwatch data on the 1 percent depth of one unnamed Binance token, as analyzed by the researcher YQ, showed a fall from about $1.2M to about $27,000. More than $19B of leveraged positions were liquidated within 24 hours across more than 1.6 million accounts, by CoinGlass's count. Against a book like that, a market order fills against whatever remains, a stop triggers and becomes a market order, and a limit order sits unfilled while the price passes. The venues also strained: Binance acknowledged platform-related issues, and traders documented reduce-only orders rejected for well over an hour, so orders sent during the event could not be counted on to arrive.
- The decision point
- Order types are usually chosen by imagining normal conditions, in which the differences between them are small. Their behavior diverges enormously precisely when depth is gone, which is the only situation in which the choice matters, and it is the situation nobody is picturing when they select from the dropdown. It is also a situation in which an order you try to place may not be accepted, so the choice has to be made in advance.
What you will be able to answer
- →What two variables does an order type fix?
- →What is a stop order, precisely?
- →What does post-only prevent?
- →How should an order type be chosen?
Orientation and Year One are open: anyone can read them without an account. From Year Two onward the lessons are for enrolled learners, because progress through the later years only means anything if it is tracked against a record.
It is free. We do not sell the list and there is nothing to buy at the end of it.
Sources and review
- https://cointelegraph.com/research/exclusively-obtained-orderbook-data-reveals-details-about-usde-crash
- https://panews.io/articles/134ad2b2-44e2-4673-9915-6db858a89e88
- https://www.coingecko.com/learn/october-10-crypto-crash-explained
- https://www.coindesk.com/markets/2025/11/15/crypto-liquidity-still-hollow-after-october-crash-risking-sharp-price-swings
- https://www.coindesk.com/research/market-spotlight-the-19-billion-liquidation-that-shook-crypto
- https://www.forbes.com/sites/boazsobrado/2025/10/21/locked-out-and-liquidated-traders-blame-binance-for-19-billion-crash/
- https://www.binance.com/en/support/announcement/detail/0989d6c7f32545bfb019e3249eaabc3f
Confidence medium·Volatility high·Reviewed 2026-10-22·Owner unassigned
Contested
F107-02 teaches order types as an execution skill at Freshman level using the Binance.US flash crash. This lesson is the full inventory and the stress-behavior analysis. Keep the split; do not re-derive the basics here.
The $1.2M to $27,000 figure is Coinwatch data on the 1 percent bilateral depth of one unnamed Binance token, from an analysis by the researcher YQ that PANews compiled; it is not a market-wide measurement and its token is not named. The USDE/USDT figure (about $89M to about $2M) is Rena Labs data published by Cointelegraph Research. Other datasets differ: CoinDesk Research's daily averages show a smaller fall in an altcoin basket (roughly .5M to .3M at 1 percent). Quote each with its scope.
The $19B and 1.6 million figures are CoinGlass counts as reported by CoinGecko and CoinDesk; Forbes put the number of traders liquidated at 1.5 to 1.7 million. CoinShares reported that the officially reported total is likely understated.
An earlier version of this lesson said no order type malfunctioned and no exchange failed to honor its own rules. The record does not support that: Binance acknowledged platform-related issues, CoinDesk reported its infrastructure buckled, and Forbes reported traders' logs of rejected reduce-only orders. The stress behavior of each order type described here is what the type specifies, which is the lesson; it is not a claim that every venue processed every order as specified.
Order type names, flags and availability differ by venue and change. Teach the classification, not any venue's menu.