# Error Codes

| HTTP Error Code | RPC Error Code | Error Message                                                  | Explanation                                                           | Mitigation                                                                                               |
| --------------- | -------------- | -------------------------------------------------------------- | --------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| 400             | -32700         | `parse error`                                                  | The request body contains invalid JSON.                               | Check the request format and ensure valid JSON syntax.                                                   |
| 403             | -32601         | `rpc method is not whitelisted`                                | The requested RPC method is not allowed by the proxy configuration.   | Use only whitelisted RPC methods. Contact MegaETH if you need access to additional methods.              |
| 400             | -32019         | `block is out of range`                                        | The requested block number is out of range.                           | Check the block number and ensure it's within the valid range.                                           |
| 500             | -32020         | `backend response too large`                                   | The backend response is too large.                                    | Reduce the scope of the request or contact MegaETH for assistance.                                       |
| 429             | -32021         | `over network traffic limit, retry in X seconds`               | The user is incurring too much network traffic.                       | Wait for the specified number of seconds before retrying. Reduce the number of requests sent per second. |
| 429             | -32022         | `over compute unit limit, retry in X seconds`                  | The user is incurring too much computation on the backend RPC server. | Wait for the specified number of seconds before retrying. Reduce the number of requests sent per second. |
| 200             | -32000         | `permanent error forwarding request context deadline exceeded` | The API proxy cannot connect to the backend RPC server.               | Pause for a while and retry. Notify MegaETH if the error persists.                                       |

## Related Pages

* [RPC Reference](https://docs.megaeth.com/developer-docs/overview-2) — full method availability table