> For the complete documentation index, see [llms.txt](https://docs.deltadefi.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.deltadefi.io/start-trading/developers/status-code.md).

# Status code

## 🚨 API Error Codes

### Response Format

All API errors return a consistent JSON structure with both human-readable messages and machine-readable codes for programmatic handling.

{% tabs %}
{% tab title="Response Structure" %}

```json
  {
    "error": "Invalid request data",
    "code": 4000
  }
```

{% endtab %}

{% tab title="Typescript" %}

```typescript
  interface ErrorResponse {
    error: string;
    code: number;
  }
```

{% endtab %}

{% tab title="Go" %}

```go
  type ErrorResponse struct {
      Error string `json:"error"`
      Code  int16  `json:"code"`
  }
```

{% endtab %}
{% endtabs %}

***

📊 Error Code Reference

| Error code |                        Message                       |
| :--------: | :--------------------------------------------------: |
|    4000    |                 Invalid request data                 |
|    4010    |                  Unauthorized access                 |
|    4050    |          Insufficient balance to place order         |
|    4100    |           Order size must be at least 5 ADA          |
|    4101    |          Order price must be greater then 0          |
|    4102    |       Price must have at most 4 decimal places       |
|    4103    |      Quantity must have at most 4 decimal places     |
|    4104    |   Post-only order would match with existing orders   |
|    4105    |   Post-only flag can only be used with limit orders  |
|    4106    |              Invalid trading pair symbol             |
|    4107    |         Order Quantity must be greater then 0        |
|    4108    | Max Slippage basis point must be between 0 and 10000 |
|    4109    |    Insufficient liquidity to execute market order    |
|    4110    |        Maximum number of open orders exceeded        |
|    4111    |  Price exceeds maximum allowed limit for this market |
|    4112    |   Price below minimum allowed limit for this market  |
|    4200    |                    Order not found                   |
|    4201    |                   Order is not open                  |
|    4202    |                Order State in invalid                |
|    4290    |      Rate limit exceeded, please try again later     |
|    4300    |        Transaction expired, please build again       |
|    4301    |              UTxO has already been spent             |
|    4302    |        Transaction has already been submitted        |
|    4400    |                    User not found                    |
|    4402    |                 Transaction not found                |
|    4404    |                Invalid status paramter               |
|    4405    |               Invalid interval paramter              |
|    4406    |       Account is missing required operation key      |
|    4407    |              Failed to sign transaction              |
|    5000    |                 Internal Server Error                |
|    5001    |        System resources temporaily unavailable       |
|    5002    |  Trading is currently locked, please try again later |