---
schema_version: "1"
id: 87b4b68fec1f3a42182485f3daa5ee37315265d460d3303c2ca859f22e77059c
title: Rate Limiting Errors
collection: developer
version: current
locale: en-us
portal_url: https://docs.salesforce.com/developer/current/en-us/marketing-cloud/guides/mc-apis/rate-limiting-errors.md
canonical_url: https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/rate-limiting-errors.html
source_site: developer.salesforce.com
content_type: documentation
content_hash: f32447a5ab00e3c30af45042836d2d829d405cf14c43d9fa8fd13703723a8fd5
products:
  - Marketing Cloud Engagement APIs and Programmatic Languages
  - Marketing Cloud
---
# Rate Limiting Errors

If API calls from an account negatively impact system performance, Marketing Cloud Engagement temporarily throttles subsequent REST API calls from that account. The throttling rate is variable depending on the severity of the impact.

If your account is throttled, API requests produce HTTP 429 error messages until the issue is resolved. If you are receiving 429 errors, [refer to this documentation](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/rate-limiting-best-practices.md) for strategies to resolve this issue.

## Error Code 50100

```json
HTTP/1.1 429 Too Many Requests Content-Type: application/json; charset=utf-8
Retry-After: 5

{
  "message": "Rate limit exceeded",
  "errorcode": 50100,
  "retryAfter": 5,
  "documentation": "https://developer.salesforce.com/docs/atlas.en-us.mc-apis.meta/mc-apis/error-handling.htm"
}
```

## Error Code 50200

```json
HTTP/1.1 429 Too Many Requests Content-Type: application/json; charset=utf-8
{
  "message": "Your requests are temporarily blocked.",
  "errorcode": 50200,
  "documentation": "https://developer.salesforce.com/docs/atlas.en-us.mc-apis.meta/mc-apis/error-handling.htm"
}
```