Maximum limit of inbound REST API Calls

[mdash]

Hi,

What is the maximum number of parallel transaction (Inbound API calls) that can be made into ServiceNow Scripted REST API Endpoint? For example, if I expose a Snow endpoint to a portal and simultaneously multiple global users are sending POST request to that endpoint, what is the maximum count after which it will fail? 

@Chuck Tomasi Is there any official documentation on this? I have seen articles that say semaphores+150 as the answer, but its not very clear. 

Thanks

[Ankur Bawiskar]

@mdash 

I don't believe any such limit exists out of the box.

But you can apply the limit

Inbound REST API rate limiting

How to restrict inbound REST web service calls

Regards
Ankur

[Stephen Farrar]

This might help:

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0792305 

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Limitations on the number of inbound API REST calls without triggering attack alert

 2118 Views  Last updated : Jun 27, 2021  Public  Copy Permalink

Description

To find the maximum number of REST transactions:

Go to the stats.do page of the instance. You can use the API_INT semaphore set, and find the value for queue_depth_limit*available_semaphores.

Resolution

In case you are worried of the max number of simultaneous requests without provoking an attack alert, you can counter this risk by setting up a Rate Limit Rule. You can define the max number of REST queries that are expected from that user. More information here:https://docs.servicenow.com/csh?topicname=create-REST-API-rate-limits.html&version=latest

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[Service_RNow]

Hi,

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0747638

Thanks

RS