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We enforce an odds ladder to prevent diming. Your offer, in implied odds, must fall on one of the steps on the ladder. Currently, that is set to intervals of 0.125%, meaning that your offer cannot fall between the steps. An offer of 50.25% would be valid, but an offer of 50.20% would not. You can check if your odds would fall on the ladder by taking the modulus of your odds and 1.25 * 10 ^ 17 and checking if it’s equal to 0. You can get the current interval from GET /metadata. It will spit out a number from 0 to 1000, where 10 = 0.010%, and 125 = 0.125%.
Odds not on the ladder will be rejected and your order(s) will not be posted.

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Validating and rounding odds

export const ODDS_LADDER_STEP_SIZE = 125n; // (0.125% = 125n, 0.25% = 250n, etc)

/**
 * Check if the odds are valid, i.e., in one of the allowed steps
 * @param odds Odds to check (as bigint)
 */
export function checkOddsLadderValid(odds: bigint): boolean {
  // Logic:
  // 100% = 10^20
  // 10% = 10^19
  // 1% = 10^18
  // 0.1% = 10^17
  // 0.001% = 10^15 → step = 10^15 * 125 = 1.25 * 10^17 = 0.125%
  const step = 10n ** 15n * ODDS_LADDER_STEP_SIZE;
  return odds % step === 0n;
}

/**
 * Rounds odds down to the nearest step.
 * @param odds Odds to round (as bigint).
 */
export function roundDownOddsToNearestStep(odds: bigint): bigint {
  const step = 10n ** 15n * ODDS_LADDER_STEP_SIZE;
  return (odds / step) * step;
}