it is possible to pay for ERC721 nft with existing ERC20 token

[Nakinthorn]

I have created my own ERC20 token already (1 year ago).

Now i try to deploy the ERC721 token for NFT marketplace.
After i deploy by the tutorial everything work well. i

But if i want to mint, buy, sell via my own ERC20 token

How i can do ?

change the contract on .sol or something else ?

pls help me or explain

thx :)

[Markkop]

Hey, @nakamuratokio!
I believe you would have to implement some token transfers logic inside the ERC721 contract, in a way it removes a given ERC20 token quantity in the msg.sender account when he mints the NFT. He would have to approve it first, of course.
If you give me a few days I can try it myself, but feel free to try it too if you've got the idea.

[Nakinthorn]

Hey, @nakamuratokio! I believe you would have to implement some token transfers logic inside the ERC721 contract, in a way it removes a given ERC20 token quantity in the msg.sender account when he mints the NFT. He would have to approve it first, of course. If you give me a few days I can try it myself, but feel free to try it too if you've got the idea.

thank you for your reply.
i try to find the solution a week already. T_T

btw, if you can figure out this.
will be very grateful

[Markkop]

What's up, @nakamuratokio.
I hope you've found a solution already.
However, in case you haven't, I've managed it to implement in my project.
Feel free to check it out, it's on feat/use-custom-token branch.
You can see the diff code on #2: https://github.com/Markkop/nft-marketplace/pull/2/files

We're basically using the ERC20 .approve method before calling the createMarketItem and createMarketSale functions and using .transferFrom inside them.

Let me know if need help understanding it!