And yes this is the lowest fee on mixer markets. For example another mixer will send you only 0.001484.
ChipMixer will give you 0.002
BTC exactly.
Yes you 100 % right, amounts less then 0.04 cheaper at bestmixer.io, but we also take 0.00015 for fast output of clean coins (30min-1hour) and confirmed coins with you. In bestmixer.io this fee are lower then 0.00015 , but there also you have to wait more time (2-3hours) confirming output funds. Mixing with us more advantageous starting from 0.04 btc for now, but we found a way how to be comfortable for all people and be most advantageous service on market despite on low or high amount you mix with us.Soon we will add 3rd slider for manual setting of output fee,it will be under delay slider. But for now mixing starting from 0.04 btc is the best price on market!
The mempool currently has 0.94 MB worth of transactions that pay a fee of 6 sat/byte, or greater. Assuming a 2 input, 2 output compressed address transaction, that's 374 bytes, meaning you'd need a fee of 0.00002244
BTC to have a near 100% chance of getting into the next block (not 100% due to SPV pools). You can overpay the fee around 7 times, but you're not going to have a faster confirmation than bestmixer.
But for now mixing starting from 0.04 btc is the best price on market!
ChipMixer will give you 0.04
BTC 
I'll help test though if you'd like.