A project for the Polygon blockchain that consists of a factory contract that can be used to create new NFT collections.
NFTs of gotSwapz collections can be purchased in packages whose content is random.
Users can also exchange their NFTs with other users in order to complete a collection.
Live app: https://www.gotswapz.online
Alternative link: https://falling-flower-1161.on.fleek.co
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.
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.
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.
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 |
The client application has been built with React and Tailwind CSS.
It is hosted in IPFS though Fleek.
The backend is a NodeJS application built with Express.js.
It is hosted in AWS with its Elastic Beanstalk service.
Object-relational PostgreSQL database, managed with AWS RDS service.
The NFTs metadata and media files are stored in IPFS with NFT.Storage.