Limitation on openURL crawling


I came across CrossRef when I was looking for a way retrieve metadata for multi DOIs. I think I would like to use openURL but I have roughly 7million data points. Is there a limit on how much I can crawl daily or for certain time frame? Many thanks.


Hello Jungyoun,

From what I can tell from your previous message I would advise that instead of using OpenURL that you query our REST API. You can find all the technical documentation for the API here and it will advise on the different routes and metadata that you are able to retrieve.

More information on the API in general can be found here: REST API - Crossref

Please do pay attention to the tips for using the REST API page which discusses the “polite” request route and backing off if there are errors.

I hope this helps and if you have further questions then please do let me know.

Many thanks,