Strike-by-strike open interest, IV, Delta, Theta, Vega, plus implied range, PCR, max pain, and support/resistance markers — refreshed every 60 seconds.
The standard exchange option-chain page shows you the raw numbers but stops short of interpretation. Strota's option chain takes the same data and lays it out as a strike ladder with smart-money markers — highest call OI flagged as resistance, highest put OI flagged as support, max pain flagged as the writers' magnet — plus the option Greeks (Delta, Theta, Vega) computed per strike so you can see what each option is worth in directional and time-decay terms.
Everything is live during market hours via real-time broker quote feeds; outside market hours it falls back to official end-of-day data (the same dataset, just last close).
Each row is a strike price, with calls on the left and puts on the right. The OI bars are sized as a percentage of the highest-OI strike in the visible window — wide bars = where the open interest is concentrated.
Under each OI value, Greeks are displayed compactly: IV (implied volatility, %), Delta (between -1 and 1), Theta (in ₹/day time decay), and Vega (₹ per 1% IV change). One glance tells you that the 24000 call has Delta 0.55 and Theta -₹17/day — you don't have to compute that yourself.
Day-over-day OI change is shown next to each value (e.g. +24k means OI grew by 24,000 contracts since yesterday). Helps spot fresh option-writer activity vs. positions that have been sitting for days.
Three markers appear next to specific strikes:
R (Resistance): the strike with the highest call open interest across the chain. Option writers expect the underlying to stay below this level — writing calls there is their bet. Acts as a soft ceiling.
S (Support): the strike with the highest put open interest. Option writers expect the underlying to stay above this level. Acts as a soft floor.
MP (Max Pain): the strike at which option writers collectively lose the least money if expiry happened today. Near expiry, the underlying often gravitates toward this level — a phenomenon traders call the 'max-pain magnet'.
Above the strike ladder, an implied-range banner translates the support/resistance markers into plain English: 'Writers expect NIFTY between 24,000 and 25,000 this week — +4.0% upside, -0.1% downside, upside-skewed.'
This one sentence captures what the entire option chain is telling you. It's the synthesised summary that traders quote on Twitter when they share a screenshot.
PCR is total put OI divided by total call OI on the nearest expiry. PCR > 1 means more puts than calls — typically a contrarian bullish signal (option writers expect a floor). PCR < 0.7 means call-heavy — typically contrarian bearish.
For each candidate strike, we sum the loss to call writers (when the strike is above their short strikes) and put writers (below). The candidate with the minimum total loss wins — that's the max-pain strike.
Implied volatility is back-solved from each option's last traded price using Newton-Raphson on the Black-Scholes pricing formula. Greeks then follow from standard closed-form formulas. Risk-free rate held at 6.5%.
If an option had no trades today or hit edge-case math (deep OTM with vanishing price), the IV back-solver can fail to converge. Rows with no IV simply omit the Greeks line rather than show wrong numbers.
Yes — every per-stock page (e.g. /stock/RELIANCE) renders that stock's option chain with the same Greeks treatment.