Dry Run

### Validate an order without placing it. **Available to:** All authenticated users **Environments:** Demo, Live **[Rate Limit](/overview/core-concepts/rate-limits):** 500 requests per hour, 1-second back-off, counts all requests Submit one or more orders (up to four) for validation against the account's pre-trade risk settings without actually placing them. The response includes a `rejectReason` if the batch would be rejected, so you can surface issues to the trader before they submit a real order. Use this to check whether an order would pass margin requirements, position limits, and other risk checks before committing to a live trade. The optional `extraPreTradeRisk` field lets you apply additional risk constraints beyond the account's default settings during validation. **Common Failure Scenarios** - The account does not exist (returns `HTTP 404`) - The caller doesn't have access to the account (returns `HTTP 401`) - The request contains more than four orders - Invalid `contractId` in one or more orders