Mineralt pays per solved hash. The payout rate is adjusted automatically every few hours based on  the global difficulty of the network and the average reward per block. The payout rate is calculated like this:

(solved_hashes)/(global_difficulty) * (block_reward) * 0.7

With the current network difficulty of 29.876G (updated Oct 24, 2017 - 14:59:23) and average block reward of 6.19 XMR (556 USD):

(solved_hashes)/29875768001 * 6.19 XMR * 0.7 = 0.000145 XMR (0.013 USD) per 1M hashes.

0.7 means that you as Mineralt’s partner will get 70% of the average XMR we earn. It's important - unlike a traditional mining pool, this rate is fixed, regardless of actual blocks found and the luck involved in finding them. We keep 30% for us to operate this service and to turn a profit.