Do I need permission from news sites to crawl their headlines that link back to them?

I want to create an app that sort of is an aggregator of news, so I would crawl sites like naij.com and get their headlines for the day and when users click on them they get sent to naij.com to continue reading. Do I need a permission for this? Also, do they have an API?

I will go ahead then provide a feature like: remove my site

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