You soul can't be traded you fucking idiot, your soul isn't a thing you just have and give away, it's your fucking mind and astral body. If you sold your soul into slavery, all you would end up experiencing is being a slave to this demon, you wouldn't even get to actually experience whatever the demon gave you to have on Earth.
Unless you set up the deal something like (
>>28099 ) in which case soon as you die, your soul will be claimed, and you will do slavery for a long period of time.
Here's the thing OP though; you have to be really fucking skilled in the occult to even do this transaction and if you had the skill needed you'd realize how damned precious your soul is and wouldn't give it up. You'd also surely have the skill to accomplish what you want without giving up your soul.
Another thing; many entities do not necessarily have a need for you soul.
Yet another fact; some entities can just take your soul from you and bring it under their control without you having to give it to them. They just fucking make you their bitch and don't give a fuck if you made a deal.
If you want easy riches and whatever, well faggot, there is no easy way. You're just going to have to become disciplined and develop yourself in the occult.
Go to the actual question thread and read the FAQ, read those books, then get started on your occult journey.
What the fuck do you need several millions or billions of dollars in a few days for? It's hard enough to get a few hundred or a few thousand dollars in a few days, nigga, you ain't ever gonna get millions or billions.
You think you soul is worth much? Your soul is probably fucking garbage. The souls of higher beings are worth far more. If you want your soul to be worth a lot, read and practise
The Universal Master Key by Franz Bardon. Your soul will acquire a ton of worthy through virtue.