What is a taker?
A taker removes liquidity by executing against orders already resting in the order book. A maker generally supplies resting liquidity.
A marketable buy executes against asks; a marketable sell executes against bids.
Taker buy and sell ratios
A data provider may express taker-buy volume as a percentage of total classified taker volume, with the remainder attributed to taker selling.
Always verify the provider's exact formula and instrument.
Aggression versus outcome
Strong taker buying shows aggressive demand in the observed trades, but price can still stall if passive sell liquidity absorbs it.
Strong taker selling can similarly be absorbed by passive buyers.
Why scanners use taker flow
Taker flow can add market-participation context to trend or momentum conditions because it describes how aggressively participants are crossing the spread.
Important limitations
Taker flow is venue- and instrument-specific. Spot and perpetual markets can show different behavior at the same time.
How aggressive trades are classified
A marketable buy that executes against resting sell liquidity is commonly classified as buyer-initiated or taker-buy activity. A marketable sell executing against resting bids is commonly classified as seller-initiated or taker-sell activity.
The exact fields and classification available depend on the exchange or data provider.
Aggression and price response are different observations
Strong buyer-initiated volume can occur while price rises, stalls or even falls. Likewise, strong seller-initiated activity does not mechanically require price to decline.
Comparing aggressive flow with the resulting price movement can provide additional context because it separates who crossed the spread from what price ultimately did.
Aggregation changes what the metric shows
Taker flow measured over one minute can tell a different story from the same data aggregated over an hour. Venue selection also matters because crypto liquidity is fragmented across exchanges.
A strategy should therefore specify the market, aggregation interval and whether the measure uses raw volume, a ratio or a normalized value.
Aggressor classification describes execution behavior. It does not identify a trader's motive, information quality or future profitability.
Key takeaways
- Takers remove resting liquidity.
- Taker flow describes aggressive execution.
- Aggressive buying or selling can be absorbed.
- Spot and derivatives taker flow may differ.
Sources & further reading
This lesson is educational material. Market structure, exchange rules, fees, margin requirements and derivatives mechanics can differ by venue and can change over time. Verify current rules with the venue you use.