# DXtrade API error: 31 Malformed query URI

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/31-malformed-query-uri, 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:

```
31 Malformed query URI
```

- Kind: API error code
- HTTP status: 400
- API: [DXtrade APIs](https://openbrokerapi.com/platforms/dxtrade)
- Status: verified. Source: [demo.dx.trade](https://demo.dx.trade/developers/#/DXtrade-REST-API), checked 2026-10-09.

## What does 31 Malformed query URI mean on the DXtrade API?

DXtrade errorCode 31, description "Malformed query URI" (the vendor's wording). The request URI is malformed and cannot be matched with the query criteria.

## How do I fix 31 Malformed query URI?

Correct the request URI.

## 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 API error: 31 Malformed query URI. Broker API Hub, https://openbrokerapi.com/errors/dxtrade/31-malformed-query-uri, 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.