How to read DaySwingTrader

One card, five questions

Every card answers the same five things, in this order:

Point 4 is the one people misread most. It is about the stock, not the option. Someone writing puts wants the stock to hold up — that is bullish for the stock, even though they sold an option.

What kind of trade it was

Sweep

One order filled fast across several price levels at once. Someone wanted in now and did not wait for a better price. Urgency is the signal.

Accumulation

Not one order — many prints on the same contract in a short window, leaning the same way. Slower and more deliberate than a sweep.

Block

A single large negotiated trade. Note: this is our word for a big print. It is not the ₹25-crore exchange "block deal" you see in the news — different thing entirely.

OI Spike

Open interest jumped sharply on a contract. This one has no tape — we see the position change, not the individual trades, so there is no bid/ask evidence behind it. Treat it as weaker than a sweep.

IV Spike

Implied volatility on a contract moved sharply — the market repriced how much it expects the underlying to move.

What the trade did

These come from two things together: which side was urgent (did they pay the ask, or hit the bid?) and whether open interest rose or fell (was a position opened, or closed?).

Those two facts give you the four states every Indian F&O trader already knows by name. Everything in the table below is one of these four, or an honest blank:

This describes the contract, not the stock. A "Long Buildup" on a put means that put is being bought with fresh money. It is not a statement about where the share price is going.

About that last column. "Conventional reading" is what the market traditionally takes each state to mean — it is not our forecast. We tested whether these labels predict what the underlying does next, across 1,225 variations, and none of them survived. Heavy call buying is not a promise the stock rises; on 18 August 2026 the two most crowded NIFTY call strikes of the day both expired worth 5 paise. Read the column as vocabulary, not as a signal.

Why "Direction Unclear" exists. If a trade prints exactly between the bid and the ask, nobody lifted the offer and nobody hit the bid. We could guess. We would rather tell you we do not know — a guess that reads as confident is worse than an honest blank.

What it means for that price level

On accumulation cards you will also see a structure word. It describes what repeated activity at that strike suggests about the level itself. These appear as "Bullish Breakout Accumulation", "Bearish ITM Call Writing", and so on.

Breakout Accumulation

Repeated call buying at a strike above the current price. Someone is paying up for the stock to break through that level.

Breakdown Accumulation

Repeated put buying at a strike below the price — positioning for a fall through it.

CE OI Build

Repeated call writing at a strike above the price, with open interest rising — so a short-call position is genuinely being built there. Whether that is a view or a hedge, we cannot see.

PE OI Build

Repeated put writing at a strike below the price, with open interest rising — a short-put position being built there.

ITM Call Buying · ITM Put Buying · ITM Call Writing · ITM Put Writing

The same activity, but the strike is already in the money. We say ITM instead of "resistance" or "breakout", because a level the price has already passed is not a ceiling or a floor any more.

Call / Put Position Unwind

The accumulation is people leaving positions, not building them.

Call / Put Accumulation

Repeated activity we can see, without enough evidence to make a structure claim. The plain version.

The score, and what it is not

The 0–100 score measures how good the evidence is — not how likely the trade is to make money. A perfect score means the tape and the open interest agree cleanly. It is not a prediction.

Strongest at the top, weakest at the bottom — the band is shown on every card, so you never have to work it out yourself. Every point traces to a stated reason on that card. If you disagree with a reason, you should discount the score — that is the point of showing them.

A real card, start to finish

A reader wrote in with a fair question: the card said bullish, so why did the call chart fall? Working through that exact trade teaches most of what matters on this site — and the answer is in the second leg.

14 August 2026, 09:15. Two prints landed on the same NIFTY strike, twelve seconds apart:

Long the call, short the put, same strike. That shape is a synthetic long — it behaves like being long NIFTY itself. Hence the BULLISH label: it describes a view on NIFTY.

What actually happened next

NIFTY opened around 24,389, dipped to 24,346, and closed at 24,424 — up about 0.14%. Almost flat. Across the prints we detected on those two contracts through the day:

The whole result sat in the put leg. Someone who sold that put watched it lose a quarter of its value, which is exactly what they wanted. The call — the only leg our card named — finished the day where it started.

The two lessons

A two-leg trade is not one chart

Looking at the call alone showed a flat-to-ugly line. The position was fine. If a card names a structure — synthetic, straddle, spread — both legs matter, and we now print both.

“Bullish” is about the stock, not the option price

It means the flow implies an up view on NIFTY. It is not a prediction that the option contract will gain value. On a flat day an option loses value to time decay no matter which way the flow leaned — that is the option working normally, not the read being wrong. A bought call and a sold put feel that same decay in opposite directions.

A second card: the one that looks bearish and isn't

The commonest misread on this site is a big put trade. The reflex is "someone is betting this falls". Often it is the exact opposite. Here is a real card from 18 August 2026, 09:22:

Read it in the order the page has been describing. Who was urgent? The seller — this filled on the bid, and cleanly, so there is no doubt about the side. Did open interest rise? Yes: 3,936 at the open, up to 5,594, closing at 4,684. Fresh positions were created, not closed. Premium down plus open interest up is Short Buildup — and on a put, that means puts were being written.

Writing a put is collecting premium in exchange for agreeing to buy at ₹3,300. You do that when you think the stock will not fall through that level. So the biggest put trade of that morning was, conventionally read, the opposite of bearish.

Newer things you may have seen

Building Now

Which strikes are adding open interest right now, refreshed through the session (9:15 AM – 3:40 PM IST). It shows where positions are being built today, rather than yesterday's finished picture.

Round trip on the trade tape

A print of similar size going the opposite way on the same contract, at least 30 minutes later, with both sides clearly one-sided. That pattern looks like a position opened and then closed.
We never claim it was the same trader — we cannot see identities. It is a pattern worth seeing, not proof. Stocks only: index strikes trade both ways all day, so there the same pattern is usually coincidence.

Call Wall · Put Wall whale tracker

The strikes holding the most call or put open interest — where the most contracts are parked. Whether a wall acts as support or resistance depends on where the price is now, which is shown next to it.