Normally, we can go long or short on bitcoin with the BTC/USD pair on an exchange. However, I would like to know if it is possible to open a position on the USD/BTC pair. This could be useful in a bear market to make a short that can never be vaporized on 1x leverage (because the USD/BTC never goes to 0, even if the price doubles or goes higher), but could go higher. For example, if you shorted this pair when Bitcoin was $19,000 on 5x leverage and let go when it was $3,700 on Christmas Eve with an initial bet of $100, you could have gotten $2,570 after. This pair is particularly profitable during a bear market, and I want to know how to do this.