Reading the Net-Arb Board
// Every arbitrage pitch shows you the left column. The right column is where the money actually is - or is not. Learn to read both, and run the arithmetic yourself.
Crypto arbitrage is real. Price gaps between venues appear constantly, and capturing them is one of the oldest trades in any market on earth. That is exactly what makes the pitch around it so effective - the first half is completely true.
The half that gets left out is the arithmetic. A spread is a headline number. What reaches you is that number minus four tolls, and on a thin gap the tolls routinely eat all of it. A net-arb board puts both columns side by side so nobody can wave the left one at you again.
// WHAT YOU WILL LEARN
- What the gross column on an arbitrage board is actually measuring.
- The four tolls that stand between a spread and a profit.
- How to read a gross-versus-net board row by row.
- A five-line test you can run on any gap, anywhere, in about thirty seconds.
- Why the surviving gaps are thin - and who took the rest.
// THE GROSS COLUMN IS A HEADLINE
The gross spread is the difference between the quoted price on one venue and the quoted price on another, at one instant. That is all it is. It is a real observation and it is also the single most misleading number in the trade, because it describes a world with no fees, no transfers, no order book depth and no clock.
Screenshots of that column are the entire marketing budget of the arbitrage bot industry. The screenshot is not lying about the number. It is lying by stopping there.
// TOLL ONE AND TWO: THE FEES
You do not make one trade, you make two. Buying on the cheap venue and selling on the expensive one means both venues charge you, once on each side. At the fee tier a normal account actually gets - not the tier a promotional table assumes - that is already a real bite out of a thin spread.
Then the asset has to move. A withdrawal carries its own fee, and while some are percentage-based, many are flat. Flat fees are the quiet killer, because on small size a single flat withdrawal fee can consume the entire spread by itself. The same gap that is workable at large size is arithmetically dead at small size, and nothing on the board tells you which case you are in.
// TOLL THREE: SLIPPAGE
The advertised price is the price for the first sliver of the order book. Push real size through and you walk down the ladder, filling at progressively worse prices the deeper you go.
This is why depth matters more than the quote. A gap that looks like half a percent at the top of the book can be a fraction of that by the time a full order fills, and thin books make the effect worse. A board that shows you a spread without showing you depth has shown you half a picture.
// TOLL FOUR: TIME
Your coins do not teleport. A withdrawal takes minutes, sometimes considerably longer when a network is busy, and the spread does not wait for the bus. By the time the coins arrive at the expensive venue, the gap you chased may have closed. It may have inverted, leaving you holding the wrong side of it.
The professional workaround is to pre-position capital on both venues so nothing ever has to travel. That works, and it is worth seeing what it costs: half a stack sitting idle on a second platform, earning nothing, waiting for a gap, and exposed to that platform's failure for every hour it waits. That is a real, continuous risk, and it never appears in a screenshot.
// READING THE BOARD, ROW BY ROW
A net-arb board is two columns and one question. Left: the gross spread, the number the pitch shows. Right: the same gap after both taker fees, the withdrawal toll and a realistic slippage haircut.
Here is a real board with the columns named. Read the card header first - that is the net figure - then work back down to the gross line that produced it. One honest caveat about any board like this: it ranks by net and shows the strongest rows, so a healthy snapshot can show every visible row surviving. That is what a ranked view does, and it is not evidence that most gaps survive - the rows that died are simply not on it. The figure is here for the anatomy of a row, not for the state of any market at any particular minute.
Read it one row at a time and the pattern appears immediately. Row after row, green on the left turns red on the right. Some gaps are dead on arrival. Some do not even cover the withdrawal. A few survive - thin, brief and real.
It is worth being precise about what a board like this can and cannot know. It knows the quotes, the published fee schedules and the depth it can see. It does not know your fee tier, and it cannot know your size - and those two inputs move the net column more than anything else on the page. A gap that clears comfortably for a large account at a negotiated tier can be underwater for a small account paying rack rates on the same two venues, at the same instant, on the same row.
That is not a defect in the board. It is the reason the board is a reading instrument rather than a signal. It shows you the mechanism and the order of magnitude; you supply the two numbers that are yours alone. Any product that claims to skip that step has quietly assumed a fee tier on your behalf, and it is almost never the one you have.
The skill is not finding a green row. The skill is being able to produce the right column yourself, so that a left column on its own never moves you again.
// THE FIVE-LINE NAPKIN TEST
You will not always have a board in front of you, and the pitch tends to arrive precisely when you do not. Five lines, any gap, any market.
- Write down the gross spread - the number being waved at you.
- Subtract both trading fees, at the tier you actually have.
- Subtract the withdrawal toll for moving the asset, and if your size is small, watch how loud a flat fee gets.
- Give slippage an honest haircut, larger if the books are thin.
- Whatever survives is the net - then ask the clock question: does this gap live longer than the minutes it takes to act on it?
Worked through with round illustrative figures, so the shape is visible: start at a gross spread of one percent. Two taker fees at roughly a tenth of a percent each removes about a fifth of it. A flat withdrawal fee on modest size might cost another third of a percent. An honest slippage haircut of a quarter percent follows. What began as a full percent is now a fraction of one - before the clock question has even been asked.
If the net is thin and the clock is fast, the answer is no. No charts, no debate, about thirty seconds. That habit is worth more than any bot subscription, because it works on everything - arbitrage today, whatever costume the next free-money story wears tomorrow.
// WHO ACTUALLY WINS THIS
Firms capture arbitrage every day, at scale and profitably. Look at what they bring: machines placed in the same buildings as the exchanges, firing in milliseconds; fee tiers negotiated at volumes an individual will never reach, so their tolls are a fraction of yours; and capital pre-positioned on every venue at once, so nothing ever travels.
When a fat gap appears, they are through it before a browser finishes refreshing. That is not a reason to feel cheated. It is the answer to the only question that matters - why is everything left over so thin? Because the good meat gets taken at machine speed, and what trickles down to a person with a browser is exactly what the right column shows.
// THE PITCH TEST
You do not need to know who is selling. You need to know the pattern.
| The tell | What it means | |---|---| | Shows gross, never net | If the word slippage never appears, the arithmetic is a costume | | A highlight window instead of a full ledger | The best week is not a result, it is a selection | | Cannot state the assumed fee tier instantly | The numbers came from a spreadsheet nobody stress-tested | | Needs your keys or a deposit into their platform | That is a custody arrangement, not an arbitrage product |
No names are needed for any of that. If a pitch dies the moment the tolls are subtracted, it was never alive.
// KEEP READING
A related trade where the income is real, the mechanism is public, and the costs are still the whole story.
The periodic payment that sits underneath a large share of venue-to-venue pricing.
// READ THE SERIES // OPEN THE ARB CALCULATOR // OPEN SPOT CARRY // ENTER THE FORGE