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For my amazon associates links (and all external links for that matter) I use the plugin, Broken Link Checker (search for it on the WordPress plugin search), which checks all the external links on my WordPress site every 72 hours (that's an adjustable timeframe). One thing to note is that on your Associates account, it will show clicks on all those links every 72 hours because of the checking, so expect that one stat to blow up if you pay attention to that kind of thing.
503 Service Unavailable
errors.I'm also looking for a better solution for this. The best I have found is a software called amzwatcher. I like it because it also finds items that are out of stock rather than just returning 404 pages. It is a bit pricey though, especially the more/bigger sites that you have.Thread dig: does anyone have a smart way of doing this in 2021?
I know about GeniusLink and use WPMU Broken Link Checker. The former is an added expense and means loading more scripts on my site, while the latter regularly shows a bunch of503 Service Unavailable
errors.