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API rate limiting

Article: 000054558
Updated: December 15, 2025

API rate limiting

Abstract

Describes the API rate limiting enforced by Moosend to prevent having too many requests.

The Moosend API enforces rate limiting to prevent the API from being overwhelmed by too many requests. This means that it allows only a certain number of API calls from users within a given time. If a user sends too many requests, API rate limiting can throttle client connections.

The following table describes the current rate limit (number of requests per 10 seconds) per user (per API key):

Resource

Method

Endpoint path

Rate limit

Campaign Statistics Activity

GET

/campaigns/{CampaignID}/stats/{Type}.{Format}

2 calls / 60s

Add subscribers

POST

/subscribers/{MailingListID}/subscribe.{Format}

10 calls / 10s

Add multiple subscribers

POST

/subscribers/{MailingListID}/subscribe-many.{Format}

2 calls / 10s

Unsubscribe a subscriber from an account

POST

/subscribers/unsubscribe.{Format}

20 calls / 10s

Unsubscribe a subscriber from an email list

POST

/subscribers/{MailingListID}/unsubscribe.{Format}

20 calls / 10s

Unsubscribe a subscriber from an email list and a campaign

POST

/subscribers/{MailingListID}/{CampaignID}/unsubscribe.{Format}

20 calls / 10s

Delete a subscriber

DELETE

/subscribers/{MailingListID}/delete.{Format}

40 calls / 10s

Delete multiple subscribers

DELETE

/subscribers/{MailingListID}/delete_many.{Format}

8 calls / 10s

Send a transactional campaign

POST

/campaigns/transactional/send.{Format}

6 calls / 1s

Manage a transactional campaign

POST

/campaigns/transactional/send.{format}

500

Example response

The following is an example of a response when request submissions exceed the rate limit. When you go over the rate limit, you receive a RATE-LIMITING error in the response body.

{
  "Code": 429,
  "Error": "RATE-LIMITING",
  "Context": null
}
 



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