Repair Once and Repair Continuous in Tradetron, Explained

Huzefa Kudrati Apr 15, 2020 Updated Oct 7, 2026 10 min read

In Tradetron, a repair condition changes a position you already hold, without waiting for the set's exit. Repair Once fires one time per entry: use it to exit a single leg, add a hedge, or roll a strike. Repair Continuous fires on every check while its condition is true: use it for repeated adjustments, and always give it a limit.

Repair Once vs Repair Continuous on Tradetron, and why every repeating repair needs a brake, in 3 minutes. हिन्दी में देखें: Tradetron पर Repair Once और Repair Continuous का फ़र्क, 3 मिनट में

Illustration of a one-time repair versus a continuous repair on a running strategy

Where repairs fit in a strategy

A Tradetron strategy is made of sets. Each set has conditions of different types:

Tradetron's strategy builder showing Set 1 with an Entry condition (time between 9:20 and 15:00), two NIFTY 50 sell legs (ATM call and put), and empty Repair and Exit sections The layout of a set: entry conditions, positions, then Repair and Exit. This set sells an ATM straddle; the worked example below buys a strangle instead

Condition type	What it does	Fires
Entry	Opens the set's positions	Once, then waits for the exit
Repair Once	Adds, removes or changes a leg	Once per entry
Repair Continuous	Adds, removes or changes a leg	Every check while true
Exit	Closes everything the set opened	When true, once positions are open
Universal Exit	Closes the whole strategy	When true

The order inside a set is Entry, then repairs, then Exit. A repair only runs while the set's entry is active.

A multi-leg strategy takes several positions for one entry: for example, a strangle buys a call and a put at different strikes. Repairs are what let you treat those legs separately, so one leg can be closed while the other keeps running.

Repair Once vs Repair Continuous

The difference is how often the repair can fire.

Timeline of twelve engine checks: the condition is true in checks 3 to 5 and 8 to 9; Repair Once fires only at check 3, Repair Continuous fires at all five true checks The same condition, read by Repair Once and by Repair Continuous

Repair Once fires the first time its condition is true. It then stays quiet until the set exits and enters again. It is the right choice for one-time actions:

Exit a leg when it hits its stop loss.
Add a hedge leg the first time the market moves against you.
Roll a short strike once a level is breached.

Repair Continuous is checked again on every cycle, and fires every time it finds the condition true. It suits actions that must repeat:

Add one lot every time the price moves another 50 points in your favour (pyramiding).
Re-hedge with futures each time the strategy's Net Delta drifts outside a band.
Re-enter a stopped-out leg each time its premium comes back to the entry price.

The keywords repairs depend on

Traded Instrument

Returns a value from a position you already took. Its inputs:

Condition Type: where the leg was opened: Entry, Repair Once or Repair Continuous
Field: price, strike, quantity, P&L or time
Underlying: for example NIFTY 50
Set Number, Condition Number, Leg Number: the exact leg

So Traded Instrument (Entry, price, NIFTY 50, 1, 1, 1) is the entry price of leg 1 of the first entry condition in set 1.

Tradetron keyword search showing the Traded Instrument keyword The Traded Instrument keyword

Traded Instrument keyword inputs: condition type, field, underlying, set number, condition number and leg number Its inputs

Traded Instrument Name works the same way but returns the instrument itself (or its expiry). Put it inside LTP and you get the live price of exactly the option you bought.

ATM

Returns the at-the-money strike, or a strike a given number of steps away. ATM uses the futures price; ATM SPOT uses the spot index price and is the usual choice for the weekly NIFTY expiry.

ATM keyword in the Tradetron keyword list The ATM keyword

ATM keyword inputs: underlying and ATM plus or minus N steps Underlying and number of steps

Steps	For a call (CE)	For a put (PE)
+1, +2, +3	Out of the money	In the money
0	At the money	At the money
−1, −2, −3	In the money	Out of the money

Option chain showing strikes above and below the at-the-money strike Steps count strikes away from ATM on the option chain

Open Positions Detail

Reads what is open right now. With the field set to count, it returns how many instruments are still open; closed legs drop out completely. That makes it the cleanest way to ask "are both legs still on?" The older Positions Detail keyword also reads quantity and value, including for positions that have closed.

Worked example: a NIFTY long strangle with one-leg stops

Here is the strategy we will build:

A long strangle profits from a big move in either direction. It loses if the market stays quiet, as both options lose value with time.

Step 1: the entry

Tradetron entry condition: time between 9:15 and 9:20 Entry: a time window at the open

In the position builder, choose the option details and, in the strike field, pick Fx to open the Formula Builder. There, use the ATM keyword with +2 for the call and −2 for the put.

Tradetron position builder with Fx selected in the strike field Fx opens the Formula Builder for the strike

Formula Builder using the ATM keyword two steps away Two strikes out of the money

Final entry positions: buy a call and buy a put, both two strikes out of the money The two entry legs

Step 2: a Repair Once for the call's stop loss

The call is leg 1 of the first entry condition in set 1. Its stop condition reads:

LTP of Traded Instrument Name (Entry, instrument, NIFTY 50, 1, 1, 1) ≤ Traded Instrument (Entry, price, NIFTY 50, 1, 1, 1) × 0.95

In words: the call's live price is at or below 95% of the price you paid.

Repair Once condition comparing the call's LTP with 95% of its traded price Repair 1: the call's 5% stop

In this repair's position builder, add the opposite trade, a sell of the same call. For the strike, use Fx with Traded Instrument and Field = strike, so it squares off exactly the strike you bought rather than today's ATM + 2.

Formula Builder with Traded Instrument and Field set to strike Same strike as the one you entered

Repair 1 position: sell the call at the traded strike Repair 1 closes the call

Step 3: a second Repair Once for the put

The put is leg 2 of the same condition, so the numbers become set 1, condition 1, leg 2, in both the stop condition and the strike formula.

Repair 2 condition for the put leg using set 1, condition 1, leg 2 Repair 2: the put's 5% stop

Repair 2 position: sell the put at the traded strike Repair 2 closes the put

Step 4: stop the second repair once the first has fired

As built so far, both legs could be stopped out. The rule says only the first stop should act; the surviving leg should run to the Universal Exit.

Add one more clause to both repairs, joined with AND:

Open Positions Detail (All, All, NIFTY 50, count) = 2

While both legs are open, the count is 2 and either stop can fire. Once one leg is closed, the count drops to 1, so the other repair can no longer trigger.

Step 5: the Universal Exit

Finish with a Universal Exit, such as a fixed time before the close, so whatever is still open is squared off.

Universal Exit condition based on time Universal Exit closes whatever is left

Common mistakes with repairs

Mistake	What happens	Fix
Repair Continuous with no limit	Trades on every check until the deployment is Blocked	Gate it with a runtime variable or a condition that turns false after firing
Wrong leg number	The stop watches the other leg	Count legs in the order they appear in the entry
Strike from ATM instead of Traded Instrument	The square-off sells a different strike and opens a new position	Use Traded Instrument, Field = strike
Hard-coded quantities	Breaks when the lot size changes	Use counts, or Traded Instrument with Field = quantity
Entry and exit true at the same time	The set opens and closes in a loop	Make the exit the opposite of the entry, or add a guard

Keep going with keywords in Tradetron, logical operators, Advanced Settings and how to debug a strategy.

Frequently asked questions

What is the difference between Repair Once and Repair Continuous in Tradetron?

Repair Once fires the first time its condition is true and then waits until the set exits and enters again. Repair Continuous is checked on every cycle and fires every time its condition is true, so it can act many times during one entry.

When should I use Repair Continuous?

Use it for actions that must repeat during a trade, such as adding a lot at each new price step, re-hedging when delta drifts, or re-entering a stopped leg. Always add a limit, such as a runtime variable it updates or a counter it caps.

Why did my strategy go to Blocked after adding a repair?

The most common cause is a Repair Continuous whose condition stays true, so it trades on every check. The other is an entry and an exit that are both true at once. Add a gate to the repair, or make the entry and exit mutually exclusive.

How do I exit only one leg of a multi-leg strategy?

Add a Repair Once with the leg's exit condition, and in its position builder place the opposite trade on the same instrument. Use Traded Instrument with Field = strike (and Traded Instrument Name for the expiry) so it closes exactly the leg you entered.

What does Traded Instrument return?

It returns a value from a position you already took: its price, strike, quantity, P&L or time. You choose which leg with the condition type, set number, condition number and leg number.

Can I backtest strategies that use repairs?

Yes. Repairs are part of the strategy logic, so they run in a Tradetron backtest the same way they run live. Check the backtest's trade list to confirm each repair fired when you expected.