Anyone not using SPL trader should be it seems to be a highly perfuming bot that trades cards on the card market and has been averaging about 18-20% APR on DEC after a 40% carry cost. They also have a OTC market with cheaper cards and a cash back system as well as a service where they sell your cards for you in a efficient way using the bot. Deff worth looking at and plopping a bit of DEC into as it could be a good source of DEC to use to pair with land resources at 20% ish and if I can ever get a chance to develop my own bot like this as i was planning to do maybe ill be able to earn a bit more than the amount due to the carry assuming i can make it profitable but these cards tend to fluctuate quite a bit and im sure once I see the actual order books and data it wouldnt be to hard to pick out patterns by analyzing all sorts of data from discord, hive , other patterns etc to determine which cards to buy up and which ones to dump and which ones to rent out while holding and looking for a buyer if there are multiple copies just make sure one is coming due every day to sell and only rent if it can fetch a nice 100% plus APR.