Payouts are made automatically every 2 hours when reaching 0.5 XPM.
Pool fee is 2% and you will paid for the transaction fee ( 0.01 min ).
Round-Based Pay Per Share (RBPPS), when a block is found, the reward is distributed among all workers proportionally to how many shares each of them has found, but payouts are delayed until a block is confirmed by the network. If a found block gets orphaned, earnings relative to it are not paid.
Minimum difficulty for a Primecoin share is 7.0 (7ch or above)
pool url: http://www.minin.gs