gotSwapz

A platform to create NFT collections that can be purchased in packages whose content is random and where users can also exchange their NFTs with other users for free to complete a collection.

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Live app: https://www.gotswapz.online

Alternative link: https://falling-flower-1161.on.fleek.co

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🔷 Inspiration

This project has been inspired by reputed NFT marketplaces like OpenSea and by the trading card collections from companies like Panini.

🔷 How it works

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🎴 Create a collection

Anyone can create a collection through the factory contract, specifying its name, a URI for the metadata of the NFTs, the size and price for each package and a rarity value for each NFT that will determine the likelihood of receiving it in a package.

When a package of the collection is sold, the owner of the collection gets the amount Matic paid by the buyer, minus a service fee established in the creation of the collection.

🛒 Buy items

Each collection can have one or more package sizes with different prices. To buy a package users call the collection contract specifying the size of the package and sending the required amount of Matic to purchase it. The order is forwarded to the factory contract, which will request random words to Chainlink. Once the random words are returned, they are sent back to the collection contract, where the NFTs for the package that the user receives are chosen randomly and proportionally to the rarity of each NFT.

🤝 Swap items

NFT owners will probably receive duplicated NFTs when they buy a package, so they can swap their NFTs with other users for free (paying just the gas fees). To do so a user can create a swap offer to another user, indicating the NFTs that are offered and the NFTs of the other user that they want in return.

The receiver of a swap offer can accept it or reject it and the creator of the swap offer can cancel at any time while it is still open.

🔷 Architecture

architecture

📜 Smart contracts

The smart contracts are written in Solidity and Foundry has been used for testing and deployment.

The NFTs use the ERC1155 standard.

Chainlink VRF service is used to achieve randomness.

They have been deployed to Mumbai and the Polygon mainnet.
Mumbai 0x4cd94a3f94b3cb6c623dff21437b1b5755c6df66
Mainnet 0x5d7addd96b0ca979b86e5eeb34b45b21cd671027

🖥 Front end

The client application has been built with React and Tailwind CSS.

It is hosted in IPFS though Fleek.

🔌 Back end

The backend is a NodeJS application built with Express.js.

It is hosted in AWS with its Elastic Beanstalk service.

🗄 Database

Object-relational PostgreSQL database, managed with AWS RDS service.

💾 NFT storage

The NFTs metadata and media files are stored in IPFS with NFT.Storage.

🔷 What's next

  • Special NFT feature: Free mintable NFT for accounts that have completed a collection.

  • Enhancements in UI/UX, including new designs and thorough validations.

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