Testing NFT2NFT — ERC20 for NFT (EV) Polygon Network

3 min readJun 3, 2021

This guide will take you through the first test towards the goal of the NFT2NFT marketplace release

Circuits of Value (COVAL)’s project EmblemVault https://emblem.finance is one step closer to its Universal Cryptocurrency/NFT Marketplace.

What is EmblemVault ?

EmblemVault (EV) is a custom Non Fungible Token (ERC-721) that is used to transfer multiple different cryptocurrencies…

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First thing to do, is to create an EmblemVault (EV) NFT

How to use EmblemVault

EmblemVault can be currently used on both Ethereum & Matic Mainnets.

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Funding the EV BTC Address with 0.0013 ($50) Bitcoin. https://www.blockchain.com/btc/address/1M9mu1WSmReS5JBo4CqzRp8GGFEb7K2wPt

If looked at from a different EVM address you see the above “Make an Offer (NFT2NFT)”.

I shall be purchasing the EV from Polygon address 0x5fD31ec5b8bEdDF0312ae0905B74E50ab0DcDDa4

I have changed the settings to switch off Dark Mode — top left corner, easier to read the drop down button text.

Clicking the “Make an Offer (NFT2NFT)” button and selecting any ERC20 token in your network address (This will be enabled for Ethereum, Polygon, BSC, xDai & Fantom networks)

On MetaMask confirm the token you wish to to the swap with (you may have to confirm this action twice).

Select the “Make an Offer (NFT2NFT)” button again and the token you just approved, then select the quantity you wish to offer for the purchase.

You have the option to “Withdraw Offer” if you wish to cancel the transaction.

I have changed EVM account to the Owner of the NFT (0x5B3cFb86a9575a2C42fd88AA71F0957004fa9209)

Clicking “My Offers (NFT2NFT)” Sign the MetaMask confirmation.

Clicking the button again will allow you to Reject or Accept the Offer, opening up MetaMask to sign the confirmation and swap will occur.

The Purchaser will get the EV NFT, and the Seller will get the ERC20 token payment.

https://explorer-mainnet.maticvigil.com/tx/0xe92b22cf2d0b4077b17a89ed65a9f92b09e5700704d1a85fb4a631723a70c955/token-transfers

1 Coval sent to the Sellers account.

This test was to show an ERC20 token swap for a NFT, however it also enabled an Over The Counter trade of 0.0013 Bitcoin ($50) for 1 Coval ERC20 token ($0.009) without any market reaction to the trade, as the Bitcoin remains in the BTC address, and has simply changed ownership.