Errors are sent per offending item, a
subscribe with three channels where
one is already-subscribed will get a confirmation for the two new ones plus one
ALREADY_SUBSCRIBED error for the third. Errors are advisory and don’t close
the connection
Per-market kill switch (FORBIDDEN)
The server keeps a hot-reloaded block list config/blocked-markets.toml). Any
subscribe, subscribe_kline, subscribe_mid_kline, or resync targeting a
blocked market is rejected with FORBIDDEN before it reaches the normal
handlers. unsubscribe / ping / set_format are never gated, so you can
always clean up an existing subscription. The list is operational and can change
without notice; treat FORBIDDEN as “this market is temporarily unavailable,”
not a permanent state.