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Select a leg at a fixed strike distance

Use a StrikePrice selector to place a leg a fixed number of strike points above or below another leg.

For example, this expression selects a strike 25 points below the short put's strike:

"StrikePrice": "leg_short_put_strike - 25"

Define the referenced leg first so its strike is available when the next leg is selected. In this example, short_put comes before long_put.

Example: a 25-point put spread​

In the AI Editor, use the following Legs array within the Structure section. Keep the other required fields in your Strategy Definition, including the expiration named 0dte.

"Legs": [
  {
    "Name": "short_put",
    "Qty": "-1",
    "ExpirationName": "0dte",
    "StrikeSelector": {
      "Min": 4,
      "Max": 6,
      "Delta": "5"
    },
    "OptionType": "Put"
  },
  {
    "Name": "long_put",
    "Qty": "1",
    "ExpirationName": "0dte",
    "StrikeSelector": {
      "StrikePrice": "leg_short_put_strike - 25"
    },
    "OptionType": "Put"
  }
]

If the short put is selected at a strike of 5000, the long put targets a strike of 4975. Use + 25 instead to target a strike 25 points above the referenced leg.

For a complete example, open the SPX-0DTE-IronCondor template from the Strategy Library in MesoSim. Follow Create and run a backtest to validate and run your strategy.