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SFO Contract & Expiry

Contract & Expiry

SFO

Lot size, strike step and the expiry calendar.

Lot size / contract value

per lot (NSE lot size) or per contract (Delta: BTC 0.001, ETH 0.01). Quantity, cash secured and P&L all use lots × this.

Strike step

The chain’s . sit on its multiples so every level is a listed contract.

NSE monthly

Last Tuesday of the month, 15:30 IST; moved to the previous trading day on a holiday.

Delta weekly / monthly

Friday / last Friday at 12:00 UTC.

Broker	Option symbol format	Example
Zerodha	NFO:{ROOT}{YY}{MON}{STRIKE}{CE\|PE}	NFO:RELIANCE25OCT1200PE
Flattrade / Shoonya / AliceBlue	NFO:{ROOT}{DD}{MON}{YY}{C\|P}{STRIKE}	NFO:RELIANCE28OCT25P1200
Delta Exchange	{C\|P}-{UNDERLYING}-{STRIKE}-{DDMMYY}	P-BTC-62000-311025

Expiry Decision — Roll, Expire or Deliver
Automation / Predefined Strategies / SFO Wheel
Run for every short option at the configured time before expiry.
Cash-Secured Put Grid
Automation / Predefined Strategies / SFO Wheel
0 = at the money (nearest strike), k = the k-th strike below spot.
Covered Call Grid
Automation / Predefined Strategies / SFO Wheel
The first listed strike ≥ max(spot, net cost × (1 + minimum gain)), plus the offset.
Reading the Wheel Preview
Automation / Predefined Strategies / SFO Wheel
Expiry timeline, put table and covered-call table explained.
SFO Capital, Orders & Risk
Automation / Predefined Strategies / SFO Wheel
A put is only sold if strike × quantity fits within max capital × (1 − reserve). Auto-filled from the grid until edited.
SFO Delivery
Automation / Predefined Strategies / SFO Wheel
The ITM put is held through expiry and assigned at the strike; the shares arrive in demat (usually T+1). The engine reconciles holdings until the shares…
SFO Particulars
Automation / Predefined Strategies / SFO Wheel
Zerodha, Shoonya, AliceBlue, Flattrade. The underlying is an NSE F&O stock; its options are physically settled.
SFO Wheel — Overview
Automation / Predefined Strategies / SFO Wheel
Grids of cash-secured puts and covered calls, joined by a roll-or-deliver decision at every expiry.
DCA Particulars
Automation / Predefined Strategies / DCA Bot
The venue and instrument. Sizes are in that instrument’s lots / contracts / shares.