How do you artificially hold up an exchange rate? If I wanted to sell my BTC I sell and that now means there are less dollars to buy any more BTC.
Right now, there exists an unusually large gap between Bid and Ask walls on Bistamp with unusually steep walls lining up at 815 and 825 respectively. In between them, there is not very much to speak off. However, all a bot (or a person) has to do is buy 0.01 BTC into the Ask wall, and that is the spot price at 825. So along comes Joe Bloggs to buy some Bitcoins and if he doesn't know any better, he thinks the price of a Bitcoin is 825, and puts in an order for 10 BTC @ 825, thus eating 10 BTC into the ask wall and probably taking the BTC from the bot owners account as their bots will ensure their coins are 1 cent cheaper than all the other coins on the wall. Thus the price is manipulated higher than the market wants it to be and the bot operators get to sell their coins at a higher price than everyone else.
But anytime there is any meaningful volume being shifted on Stamp at the moment, it is always at markedly lower prices than the spot price being maintained by algorithmic bot micro-trades. However as soon as an 80 BTC order goes through at $816, the bot orders 0.001 BTC at the ask wall, and the spot price is back up at 825 within a microsecond.
