I think they mean, 100 free tx for each person every hours. "you can submit any TXID of delayed transactions that at least include a fee of 0.0001BTC/KB" every tx must have at least 0.0001btc/kb fee. Updated website page and thread.
~snip
And if it's 100 per person every hour, why does it always rejects my very first 10sat+/byte tx at Hour:10 and above?

But they always accept my 60+sat/byte transaction regardless of the minute.
I'm almost 100% certain it used to be a fixed 100 transactions per hour, because I used to be able to put in the min 10 sat/byte txs if I submitted right on the time the 100-limit counter refreshed (which, if I recall used to be on the hour, and then randomly within a 5-min period around the hour).
I haven't used it for the longest time, since I only do 1 sat/byte txs now =p... and last I checked, antpool still accepted that (but apparently, is ineffective anyway).
Well, afaik antpool need to log in. So, in case some people don't want to log in or create account there, can try this one.
You need an account yes, but it's only an email that you need registered. Been using a throwaway account for antpool.