Hello everyone, is there any way to interact with deposit/withdraw functions of a DEX or a yield aggregator using Solidity? I'm new to these things, I'm a C#/C++ Dev, I was expecting to find some APIs on those platforms' github.

You can create on telos blockchain if you know c/c++

Problem half-solved. I need to use Solidity, I found the right yield aggregator, but I need the DEX now. Curve isn't built with Solidity, then I tried with UniswapV3 but it doesn't have docs for V3, then I tried with UniswapV2 but I'd have lost too much for the swap, then I tried 1inch but it doesn't have a router afaik.

You can interact with other contracts, yep.

I'm trying to swap using UniSwapV3 Router, but I'm wasting time cause Openzeppelin sucks.

???

OpenZeppelin is awesome dude.

I use it on daily basis.

The github repo sucks. I'm dealing with Solidity 0.6.6 and all deps don't work. I'm remaking all of them on my repo, using the 0.6.0.

What's the issue with v2 router?

The issue with v2 router is that I can't swap without losing 50%

On v3 router I can swap and lose only 0.225% or something like that.

Why that specific version?

Aave's flash loan works on 0.6.6 according to the guide.

Umm losing what exactly?😅 Fees?

Example: I need to swap a stable coin for a stable coin, the amount to swap is 1mln. When I make the swap, the amount is not 1mln, but 400k. That's a huge difference.

On v3 if I swap 1mln, I get 1mln.

Aah the lower liquidity. Yeah I think most of them migrated to v3 liquidity pool

Maybe try sushis router then?

It gives me 200k

Anyway, I got 20 error like these. That's not my fault obviously. How can I compile a contract that need dependences that don't find their dependences? That's a nightmare.

That's wierd. Just tried usdc usdt and for 1 mil I get 980k

And USDT -> USDC?

982k

Mine was an example. I got a flash loan of 10mln+.

Well I'm using frontend

Try to swap 10mln+, you'll lose at least 15%.

You can't expect that much liquidity other than uniswap tbh🙃

1inch

I'm not sure how to deal with it tbh

1inch is not a dex, its an aggregator of dex

Ah

Swaps through different dexes at the same time

That's cool

They have some kind of aggregation router, not sure how exactly that works

Well, I'm gonna use uniswap v3.

The main problem is that it uses solidity 0.7.6, but I can't use this version.

Why not?

Why are you importing external contracts/interfaces?

You should develop with Truffle honestly for starters.

Cause all files were on 0.6.6
Nvm, I'm gonna redo everything.
All flash loan platforms use 0.5.0/0.6.6
UniSwapV3 uses 0.7.6.

For instance: SafeMath can be copied locally pretty easily

think this is a real issue.
Have you tried dydx? They don't have flashloan per se. But you could build a canonical contract to do the same

I'm trying dydx right now, I need to deal with js tho.

Yeah, there's that