hook_unavailable

The pre-trade hook didn't give a valid answer. The hook fails closed, so the order wasn't sent.

HTTP 503. Nothing reached the broker.

Likely cause: The hook URL is down, slow or answered invalidly.

What to do: Fix the hook, then send the order again.

Retry: Yes. Nothing happened (or it was a read), so repeat it, after Retry-After when present.

Listed under Pre-trade hooks, holds and kill switches in Errors. Send the error’s requestId to support and we can find the request.