What market tide describes
Market Tide is a name popularised by Unusual Whales for a market-wide view of options flow: net call and net put premium aggregated across a broad universe of tickers and plotted cumulatively through the trading day.
The chart usually shows two running totals (cumulative net call premium and cumulative net put premium) building from the open. The read is comparative: calls pulling away from puts is treated as risk appetite, puts pulling away as demand for protection, and the two moving together as indecision.
Similar constructions exist under other names on other platforms. The idea is not proprietary even where the specific implementation is.
What it aggregates
Each point on the curve is a sum of net premium, premium traded aggressively by buyers minus premium traded aggressively by sellers, across every ticker in the universe, accumulated since the open.
That inherits every limitation of the underlying measure, and adds one of its own.
The inherited ones matter first. Trade prints carry no buyer or seller flag, so the aggressive side is inferred from whether a fill landed near the bid or the ask. Multi-leg structures print as separate legs, so a spread contributes to both totals. Hedges are indistinguishable from speculation. Closing trades look identical to opening ones.
The problem cumulation adds
The specific hazard of a cumulative curve is that it never forgets.
A single large print early in the session shifts the level for the rest of the day. Every subsequent reading sits on top of it. Two hours later, a trader looking at the chart sees a persistent tilt and reads it as sustained pressure, when it may be one trade at 09:35 and noise since.
This produces a characteristic misreading: the curve looks like a trend because cumulative sums always look like trends. Any series of same-signed increments does. The shape is partly an artefact of the construction rather than a property of the market.
Two habits help. Look at the slope rather than the level, the rate at which the gap is widening now, not how wide it has become since the open. And check whether the separation happened gradually or in one step, because those are very different observations wearing the same shape.
Where it is genuinely useful
Aggregating across hundreds of tickers does something the single-name version cannot: it averages out the idiosyncratic explanations. One name's flow might be a spread leg or an earnings hedge. Across the whole market, those largely cancel, and what remains is closer to a genuine aggregate tilt.
That makes market-wide flow more defensible than single-name flow as a sentiment reading, which is the reverse of how the two are usually presented.
It is also most informative at extremes rather than in the middle. A day that ends near the widest call-put separation of the last several months is telling you something. A day in the middle of the range is not, and most days are in the middle of the range.
How it relates to other breadth measures
Market tide is one of several ways to ask whether participation is broad or narrow, and it is worth reading against the others rather than alone.
The put/call ratio asks the same question using contract counts rather than dollars, which weights a hundred cheap contracts equally against one expensive one, and so behaves quite differently.
Traditional breadth indicators (advancers versus decliners, new highs versus new lows) ask it of the underlying stocks rather than the options.
Divergence between them is the interesting case. Options flow tilting bullish while breadth deteriorates is a different market than both agreeing, and the disagreement is usually more informative than either reading on its own.
What we publish
We publish a free market tide page: cumulative net call premium and cumulative net put premium through the session, rebuilt from the 06:30 Pacific open, with no account.
Read the differences before comparing the two side by side. Ours is computed from repeated snapshots of a delayed options chain rather than from trade prints, so a contract contributes the premium behind its day volume rather than one execution at a time. The universe is the 20 symbols our scanner rotates through, not the whole market. The aggressive side is inferred from where the last trade sat relative to the quote, and contracts that printed mid-market stay unknown and are reported in their own total rather than being pushed onto one side. What that buys is that the curve never claims a side it could not observe; what it costs is resolution.
The single-name view of the same activity is the free options flow scanner, our positioning work is concentrated on dealer gamma, where we compute from the full chain rather than aggregating inferred trade sides, and our comparison of SquawkFlow and Unusual Whales sets out what each side actually publishes.