The fees are constantly changing because of the Bitcoin network. If you want to confirm the minimum fee at the moment of your transaction, you can contact the support team through the Live Chat on spectrocoin.com.
How retarded do you take your clients for? Having a static minimum fee of 0.001 which ammounts to ~222sat/b is not what you call constantly changing, while transactions with fees like 10sat/b go in the next block. Stop ripping off your customers, classic Lithuanian scammers.