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Listing 4.5: Reducer applied to leasing actions. Similarly, we also have an accountReducer and a loanReducer . However, all the states from our three reducers have to be combined into a single central state for the Redux store of the application, following the guidelines of using Redux. To achieve this we have combined all the reducers into the rootReducer using the combineReducers function of Redux. We could have as many reducers as needed, but there has to be a single central store. 4.2.4 OpenSea Services OpenSea provides access to their APIs for fetching ERC-721 assets. [40] We have decided to use their API because it would cut overhead and switch the focus to the development of the core functionalities of the NFT.finance platform. Moreover, it has proven to be flexible and reliable enough for all our needs, which will be explained in this section. It works on the Rinkeby test network and the main Ethereum network. Since the application is not ready for release at the moment we have decided to use Rinkeby, where our smart contracts have been deployed. Moreover, there are multiple ERC-721 tokens available on Rinkeby for purchase through the OpenSea marketplace using Rinkeby Ether, which is free. First of all, the APIs were used to retrieve and display the ERC-721 tokens of the user, as well as their properties. 1 2 3 4 5 6 7 8 9 export const getAssetsOpensea = async (account) => { return axios.get( 'https://rinkeby-api.opensea.io/api/v1/assets/', { params: { }); } order_direction: 'desc', owner: account, } Listing 4.6: Example of API call to OpenSea using Axios to retrieve user assets. The API calls are made using Axios and will return a promise. For the API to return the user’s assets we have to specify the owner in the query parameters. Finally, this function is exported to be used by the account actions, namely getAccountAddressAction . Another use of the OpenSea APIs is to retrieve the assets for the NFTs of each individual lease offer or loan request. This request is mapped on all the lease offers and loan requests, using the corre- sponding smartContractAddressOfNFT and tokenIdNFT. 51PDF Image | NFT finance Leveraging Non-Fungible Tokens
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