The trade mining method was first introduced into the exchanges market by FCoin. Basically it is the method of rewarding customers according to the amount of trading made on the platform with the exchange token itself. If you traded 1 BTC on the day, that means your commission paid for exchange is 0.001 BTC (0.1%). Now supposing that the token is worth 0.00001 BTC, you will then receive 100 tokens as a payback from your commission. This is the method used by FCoin.
The idea was revolutionary that caused FCoin to fire in the exchanges' ranking, surpassing Binance 3 times in its heyday and dominating world #1 in trading volume. However, this method has the negative side, created a self-destructive ecosystem where the few had most tokens. The mass issue caused the FT token to go through overinflation and that it was no longer worth "mining" token FT.
After FCoin, came dozens of exchanges with the same concept or slightly altered in quantity and some details added, just to attract more audiences. But all of them after some time were left behind by failing to maintain healthy token cycle.
The Micro came with a new concept of mining by percentage of contribution. In the Micro has a determined quantity of tokens to be mined and user that makes more contribution in volume of negotiations, it takes more tokens. For example, the amount to be mined on the day is 100,000 tokens and trading volume on the platform was 100 BTC. If a user made trades on the day equivalent to 1 BTC, that is, contributed 1% of total volume, it takes 1% of 100 thousand tokens which is 1 thousand tokens.
What's more, the Micro has a reward system for MIC token holders.