# DXtrade order rejection reason: OrdRejReason 18 INVALID_PRICE_INCREMENT

Independent and unofficial. Not affiliated with or endorsed by any broker or platform named here. Educational only: nothing here is advice, and nothing here recommends a broker or a trade.

This is the markdown version of https://openbrokerapi.com/errors/dxtrade/ordrejreason-18, written from the same records as that page.

Risk warning: CFDs and spread bets are complex instruments and come with a high risk of losing money rapidly due to leverage. You can lose money on these products, and each provider publishes its own loss figure under FCA rules. You should consider whether you understand how they work and whether you can afford to take the high risk of losing your money. Automated and API trading can amplify losses through bugs, connectivity failures and runaway orders.

The error, as text you can copy:

```
OrdRejReason 18 INVALID_PRICE_INCREMENT
```

- Kind: Order rejection reason
- Where you meet it: In the rejection the API reports, not in the HTTP status
- API: [DXtrade APIs](https://openbrokerapi.com/platforms/dxtrade)
- Status: verified. Source: [demo.dx.trade](https://demo.dx.trade/developers/#/DXtrade-FIX-Trading-API), checked 2026-10-09.

## What does OrdRejReason 18 INVALID_PRICE_INCREMENT mean on the DXtrade API?

In the DXtrade FIX Trading API, INVALID_PRICE_INCREMENT is value 18 of the OrdRejReason (103) field, which the vendor says is present only on rejected orders. The vendor's page lists the value by name and gives it no further description.

## No fix in the source

The vendor's page gives no remedy. The Text (58) field of the reject carries the vendor's error code and description.

That is all the source says, so this page does not invent a fix. General guidance: [the other order rejection reasons recorded for DXtrade](https://openbrokerapi.com/errors/dxtrade#order-rejection-reason), the [error lookup](https://openbrokerapi.com/tools/error-lookup) for the exact text of the reply you received.

## More on the DXtrade API

- [All DXtrade API error codes](https://openbrokerapi.com/errors/dxtrade)
- [DXtrade API error codes](https://openbrokerapi.com/errors/dxtrade): 79 decoded, each with what it means, and the fix where the source gives one.
- [DXtrade API endpoints](https://openbrokerapi.com/platforms/dxtrade/endpoints): 21 documented, each with its method, path, parameters and source.
- [DXtrade messages](https://openbrokerapi.com/platforms/dxtrade/messages): 8 documented, each with its fields and source.
- [DXtrade API page](https://openbrokerapi.com/platforms/dxtrade): The full record: access, authentication, limits and the source for each.

## Licence and how to cite

The records behind this page are all rights reserved. This file is the page itself, at its own address, in another format. It is not part of the CC BY 4.0 downloads listed at https://openbrokerapi.com/data. Quote from it with a link to the page.

Cite as: DXtrade order rejection reason: OrdRejReason 18 INVALID_PRICE_INCREMENT. Broker API Hub, https://openbrokerapi.com/errors/dxtrade/ordrejreason-18, newest check 2026-10-09.

Where you rely on a single figure, cite the source and the checked date printed beside it as well. Where this page and a broker's own documentation differ, the documentation wins.