5xx error in Google Search console for 'get-order-info'

I'm getting a 5xx error in Google Search console for this page:

.../wp-json/fluent-cart/v2/checkout/get-order-info

This is over my head but my instinct is to exclude /wp-json/ from indexing

but it does make me wonder...

what is that? and if GSC is finding it, does that mean there's a link to it and then if so, shouldn't it be working?