FX · Reading the FX market · lesson 6 of 9 · 5 min read · David Alexander

Volume in FX, and why every platform's differs

Tick volume

FX has no central record of traded amounts, so the volume bars on a retail FX chart do not show volume. They count ticks - how many times that broker's own quote changed in the period - which correlates loosely with activity and says nothing about size. Two platforms disagree about it routinely, and both are counting honestly.

The volume bars under your FX chart look like an instrument reading - a measured quantity, like the price above them. They are the least trustworthy numbers on the screen, and knowing exactly why protects you from a whole family of confident-sounding analysis built on top of them.

What is the platform actually counting?

Quote changes. A share exchange records every trade and its size, so equity volume is a measurement. FX's dealer network from module 1 has no such tape: nobody sees every trade, and nobody publishes sizes. So platforms count the only thing they have - how many times their own assembled quote ticked in the period - and label the count volume. A EUR 50m order and a EUR 50,000 order that each move the quote once count the same. A busy quote feed counts more than a quiet one carrying identical flow. The number is a shadow of activity, cast by one broker's feed.

To be fair to the shadow: tick counts do rise when the market is busy, because busy books re-quote more. Across a day the shape of tick volume tracks the sessions from module 1 well enough. The trouble starts when the proxy is promoted into a measurement - volume confirms this, volume diverged from that - carrying a precision it has never had. It feels like a real indicator. It is a count of quote flickers, and it changes with the broker, as the worked example shows.

Worked example

figures in USD

You hold 0.5 lots of EUR/USD through an hour that travels 35 pips. A pip on a full lot is worth $10.

The same hour of EUR/USD on two platforms: one reports 4,100 ticks of volume, the other 2,900 - 40% apart, both counting their own feeds honestly.
Your 0.5 lots position experienced the identical hour on either: 35 pips of travel at $5 per pip ($10 per full lot) is $175, to the penny, on both platforms.
That is the asymmetry to remember: price settled your account and the two feeds agree on it within a wick. Volume touched nothing and they disagree by nearly half. One of these numbers deserves your attention.

What this means for you

Use tick volume for the one thing it weakly supports - a rough sense of busy against quiet, which the session clock already gave you - and refuse every promotion beyond that. When analysis leans on FX volume as confirmation, ask what was actually counted, because the answer is quote flickers from one feed. If you want a liquidity gauge with consequences, the next lesson has one: the spread is measured, it differs by the minute, and unlike tick volume, you pay it.

Check your understanding

Question 1 of 4

What do the volume bars on a retail FX chart count?