> ## Documentation Index
> Fetch the complete documentation index at: https://docs.methodfi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Request Errors

Method uses conventional HTTP response codes to indicate the success or failure of an API request.
In general: Codes in the `2xx` range indicate success. Codes in the `4xx` range indicate an error occurred
with the information provided (e.g., a required parameter was omitted, a resource was not found, etc.).
Codes in the `5xx` range indicate an error occurred within Method's servers.

## Attributes

#### HTTP STATUS CODE SUMMARY

| code | function | Description |
| - | - | - |
| `2xx` | `OK` | Everything worked as expected. |
| `400` | `Bad Request` | The request was unacceptable, often due to missing a required parameter. |
| `401` | `Unauthorized` | No valid API key provided. |
| `403` | `Forbidden` | The API key doesn't have permissions to perform the request. |
| `404` | `Not Found` | The requested resource doesn't exist. |
| `409` | `Conflict` | The request conflicts with the current state of the resource. |
| `429` | `Too Many Requests` | Too many requests hit the API too quickly. We recommend an exponential backoff of your requests. See [Rate Limiting](https://docs.methodfi.com/2026-03-30/reference/rate-limiting.md). |
| `500` | `Server Errors` | Something went wrong on Method's end. |

```javascript THE ERROR OBJECT theme={null}
{
  "type": "INVALID_REQUEST",
  "code": 400,
  "sub_type": "INVALID_SOURCE_LIABILITY",
  "message": "Invalid source account received. Only ACH accounts can be used as a source."
}
```

```json theme={null}
{
  "success": false,
  "data": {
    "error": {
      "type": "INVALID_REQUEST",
      "code": 400,
      "sub_type": "INVALID_SOURCE_LIABILITY",
      "message": "Invalid source account received. Only ACH accounts can be used as a source."
    }
  },
  "message": "Invalid source account received. Only ACH accounts can be used as a source."
}
```


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