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Some free APIs run by governments provide fairly good stability as they fall under the umbrella of "critical infrastructure".

To help with the real time, could maybe add a layer of hot caching or the user could submit a batch job. if one fails, it's not blowing up the request.

> But since these are public/free APIs, I would be careful using them into production work, mainly for stability/scale reasons.

Many of the ones I saw are "free up to N requests, then $". That is, things that have a free tier.

Which is still valuable, but is very different if you want to be able to scale. Scaling by writing a larger check is a nice safe path forward.