Why you should know this
The top price may cover only a small quantity; depth shows how an order may move through several levels.
This is not about being told which trade to take. We are learning how to inspect the mechanism together, so a later decision is more deliberate and reviewable.
The short answer
This lesson turns the mechanic into a pre-trade execution check covering price control, cost, fill risk and the reader’s next action.
Price level versus individual order
A row may combine several individual orders at the same price. The displayed 300 units at ₱103 could belong to one participant or many. The interface may also group nearby prices into a wider display bucket.
Do not infer identity or coordination from a row. We see eligible displayed interest according to that venue’s data presentation, not the complete motives behind it.
The DEPTH check
Before placing a meaningful order:
- D — Direction: buys consume asks; sells consume bids.
- E — Each level: how much quantity is available at each price?
- P — Price impact: what average and worst price does the static book imply?
- T — Time: how quickly is the book changing?
- H — Hidden uncertainty: cancellations, other venues and undisplayed liquidity?
If the implied worst price exceeds the plan, reduce size, use a controlled limit or decline the trade.
Philippine practical scenario
Miguel wants to convert crypto to PHP. The top bid appears attractive, but it covers only a small fraction of his amount. A larger sell would move down several levels.
He compares:
- smaller staged orders;
- a limit order with non-fill risk;
- another verified route;
- the total PHP after trading and Withdrawal costs;
- whether delaying is acceptable.
The order book helps with one stage. It does not verify the provider, bank route or final availability.
Common mistakes
- Looking only at the best bid or ask.
- Treating a wall as guaranteed support or resistance.
- Ignoring cumulative quantity.
- Forgetting that order rows may be aggregated.
- Assuming trades at our limit guarantee our place has reached the front.
- Using global volume to justify local order size.
- Accusing manipulation from cancellation alone.
A no-money depth lab
Copy the fictional book above. Calculate:
- Average fill for a 250-unit market buy.
- Average fill for a 400-unit market sell.
- Unfilled quantity if a 450-unit buy limit is capped at ₱102.
- Which side matters for a planned crypto-to-PHP sale.
- Three reasons the actual result could differ from the screenshot.
A familiar Philippine or Asian example
A learner in the Philippines studies a fictional crypto quote and writes the pair direction, intended action, price control, estimated cost, possible fill problem and exit plan. The exercise uses paper values only. No order is placed.
One risk or limitation
Examples simplify execution. Real venues differ in order logic, trigger source, fees, tick and lot sizes, available liquidity and outage handling. A checklist can reduce avoidable mistakes, but it cannot guarantee a price, fill, exit or profit.
How this connects to market mastery
Market mastery includes execution discipline. A strong market view can still fail when the pair, order type, size, liquidity, fee or exit mechanics are misunderstood.
Quick check — no money needed
Use a fictional quote. Write the pair, buy or sell action, order type, price control, size, estimated fees, liquidity concern and the condition that would cancel the plan. Then explain which field protects you from the largest avoidable mistake.
If you can explain your answer and name the main limitation, this lesson is complete.
*Cryptocurrency and virtual asset transactions are highly volatile and irreversible, may result in significant losses, and do not guarantee returns; customers should trade only after understanding the risks involved.
