My situation is that I haven't been able to get in touch with the founders of a YC company for a few months after engaging them on a project, signing agreements, and wiring them a considerable sum of money (tens of thousands).
The last communication from the company was an informal email from the CEO in July saying they were dealing with funding issues, but that's the last I heard from them, which feels totally unacceptable.
Is there a channel for communicating this type of issue directly with YC?
It seems that what you are looking at is a breach of contract where the company did not deliver what they agreed to deliver.
If the company ran out of money, they are probably a dead company/ bankrupt and have or will shut down. They are unlikely to be able to return the money or deliver, and you could end up either trying to sue a company that is dead and/or pierce the corporate veil alleging fraud.
Check with your lawyers.
YC, HN has nothing to do with it, though.