A free trial of an amount of credits that would otherwise cost $100, I'm assuming.

Could be. Does such a thing exist?

Not outwardly/visibly/readily from a quick scan of their site and a short list of search results.

I misremembered, because I was checking out all the various trials available. I think I was thinking of Google Cloud's $300 in credits, since I'm using Claude through their VertexAI.