# 44000
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/44000/index.md

This error occurs when calls made have reached the maximum limit allowed by a financial institution in a given time frame.

|             Title             |                                                                                    Details                                                                                     |
|-------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Aggregation Status Code**   | 44000                                                                                                                                                                          |
| **Remediation Category**      | Retry Later                                                                                                                                                                    |
| **HTTP Status**               | 202                                                                                                                                                                            |
| **Error Type**                | Request Error                                                                                                                                                                  |
| **Data Connect Alert**        | No associated alert.                                                                                                                                                           |
| **Error Message**             | Invalid App key.                                                                                                                                                               |
| **Common Causes**             | This error indicates that you have reached your maximum API usage plan limit. The number of requests you have made has exceeded the threshold set for your current usage plan. |
| **Troubleshooting Steps**     | Review your usage plan to understand rate limits. Reach out to your support team if you require higher rate limit than what's available to you. ​                              |
| **Data Connect Fix Eligible** | No.                                                                                                                                                                            |
| **Retriable by End User**     | No.                                                                                                                                                                            |
| **Access to Latest Data**     | You cannot access the latest data for this account until the issue is resolved.                                                                                                |

[Full Error List](https://developer.mastercard.com/open-finance-us/documentation/errors/error-list/index.md) \| [Request Errors](https://developer.mastercard.com/open-finance-us/documentation/errors/request-errors/index.md)