If you want to fix the price of a currency between (for example) $0.95 and $1.05, you simply offer to sell to anyone at $1.05 and offer to buy from anyone at $0

If you want to fix the price of a currency between (for example) $0.95 and $1.05, you simply offer to sell to anyone at $1.05 and offer to buy from anyone at $0.95. As long as you don't go bankrupt, you can keep doing this and pretty much guarantee the price will never exceed that range even on other market, or people will simply arbitrage the excess away.