How can you actually tell if a swap agg is safe to use?

I’m trying to move my smaller trades away from CEXs to aggregators, but I’m struggling to vet their reliability. CEXs at least have audit histories and proof of reserves, whereas aggregators feel like a black box. I don't want to just blindly trust online reviews.

> For those who use them: do the final rates actually match what's shown on the widget? Also, if a swap ever gets delayed or stuck, how responsive is their support team?