Invalid Formula Reference

A formula references a name that cannot be resolved when the expression runs. This usually means one of the following:

Missing payload field (signal.<key>)

• The name is misspelled or uses the wrong casing (JSON keys are case-sensitive).
• The field is missing from the webhook JSON (for example you reference signal.entryPrice but only sent closePrice).
• You used a bare identifier (for example closePrice) instead of the required signal.<field> form.
• A nested path is wrong (for example signal.extras.atr when the payload key is ATR).

Formulas can read top-level keys and nested object properties from the same webhook payload — for example signal.limitPrice, signal.extras.ATR, or signal.extras["ATR"]. JSON arrays remain arrays (for example min(signal.values)). If a nested key is missing, the formula fails with this error and the message includes the nested path (for example extras.doesNotExist).

Unknown rounding mode (rounding.<mode>)

The third argument to round() may use the built-in rounding context, for example rounding.halfEven. Property names are camelCase. Legacy PHP constant-style names (for example rounding.HALF_EVEN) are not supported.

Supported names:

• rounding.halfAwayFromZero, rounding.halfTowardsZero, rounding.halfEven, rounding.halfOdd
• rounding.towardsZero, rounding.awayFromZero, rounding.negativeInfinity, rounding.positiveInfinity

You may also pass an integer from 1 to 8 as the third argument to round().

Typical error details (webhook log)

The formula in field limitPrice references entryPrice, which is not present in the payload.

The formula in field x references rounding.unknownMode, which is not a supported rounding mode.

(The field name and the missing identifier are filled in for your request.)

Incorrect (missing payload key)

{
  "ticker": "SPY",
  "action": "buy",
  "closePrice": "450.25",
  "limitPrice": "=signal.entryPrice + 0.5"
}

entryPrice was never sent, so the reference cannot resolve.

Incorrect (missing signal. prefix)

{
  "ticker": "SPY",
  "action": "buy",
  "closePrice": "450.25",
  "limitPrice": "=closePrice + 0.5"
}

Use signal.closePrice so the expression reads from the payload context.

Incorrect (unknown rounding mode)

{
  "ticker": "SPY",
  "action": "buy",
  "x": "=round(2.5, 0, rounding.HALF_EVEN)"
}

Use rounding.halfEven instead.

Correct

{
  "ticker": "SPY",
  "action": "buy",
  "closePrice": "450.25",
  "limitPrice": "=signal.closePrice + 0.5"
}

Correct (nested object under extras)

{
  "ticker": "SPY",
  "action": "buy",
  "quantity": "=signal.extras.riskBudget / signal.extras.ATR",
  "extras": {
    "ATR": 53,
    "riskBudget": 150
  }
}

Related errors

• Invalid formula dependency — the name you referenced is another field whose value starts with = (chained formulas are not supported). Use a single formula or send a literal value for the intermediate field.
• Invalid formula syntax — the expression could not be parsed at all; fix operators and parentheses first, then re-check field names.
• Invalid formula runtime — an integer outside 1–8 was passed as round()'s third argument; use a rounding.* name or a valid mode integer.