I just marked up my AAVE page for the benefit of discussion.
There's two strategies here. One is borrowing MATIC, let's go over that first.
You deposit your MATIC in AAVE. Simply having it sitting there pays out, as of this screenshot, 1.94 percent MATIC and 5.16 percent wMATIC (wrapped MATIC.) Just doing this alone, you're making money.
But, there's no reason JUST to leave it like this. So what you can do is, actually take a loan OF MATIC with your own MATIC as collateral...which doesn't make sense, why would taking a loan net you money? Well, it does, because they're giving a bonus to borrowing to get people using the site and providing liquidity.
So as you see, BORROWING MATIC costs you 6.14 APR. BUT...look right under that...you actually get 13.09 percent BONUS wMATIC for borrowing...which makes you borrowing money get paid more than what you pay to borrow it.
This wMATIC bonus accrues every 10 seconds. Then you collect it, and it goes into your wallet, and you can convert it to regular MATIC on QuickSwap for no real cost because MATIC is cheap as fuck to deal with.
That's the 1 easy, lazy thing you can do...and since you're borrowing MATIC *with* MATIC, you don't have to be worried about being liquidated because it obviously goes up and down with itself. The even cooler thing is, you can redeposit the MATIC you borrow and borrow more MATIC against it, just enhancing your gains of bonuses.
STRATEGY NUMBER TWO:
You borrow a stablecoin - - USDT, USDC, DAI - - all pegged to $1. These also have a base APR and bonus wMATIC, but those numbers you can more or less ignore, because that's not the point of borrowing stablecoin.
Let's say you borrow $10,000 worth of USDT, which is obviously 10,000 coins, when MATIC costs exactly $1 a coin. You borrow these 10,000 coins, you go to QuickSwap, and convert them to $10,000 worth of MATIC, then redeposit that in AAVE.
You wait a day, and MATIC goes up to $1.50. Well guess what...since your MATIC is worth 50 percent more now, you can go to QuickSwap, convert the MATIC back to USDT, and pay it back with half the coins you used to buy it...which nets you essentially 5000 "free" MATIC in arbitrage. Get it?
Now you DO have to be careful here...see the "health factor" below in the image? If that gets to 1, you get liquidated...so if you borrowed that USDT and MATIC goes half price, and you overextended, you're fucked...so you want to keep that at, in my opinion, 2.5 or so to sleep good at night and not worry about it. Don't get greedy...if you keep it at 2.5 or so there would have to be a catastrophic dip for it to be liquidated. This number matters very little when you're borrowing MATIC as it stays stable, but when you're borrowing anything else...
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