OTC - Cancel Order

The following code example is provided to help you understand the business process. For commercial use, you must handle parameter validation and exception handling on your own.

This example is tested on the Polygon-Amoy chain. Information used in the example can be retrieved from the Source directory. Any amounts involved must be converted using toWei(amount, "decimal") for proper precision.

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Code Example

javascriptCopy code// Import web3js library
import Web3 from 'web3';
import OTCTradeABI from '../abi/OTCTrade.json';

// This example is tested on the Polygon-Amoy chain
const amoy_chainId = 80002;
const amoy_chainName = "AMOY";
const amoy_chainRpcUrl = "https://polygon-amoy.infura.io/v3/4ba314367838400fb88f2a1d0e14d42d";
const amoy_contract_OTCTrade = "0x0C4A4390A1ae1186644a0F0354c49880595aD328";
const amoy_account = "0xA3932E6Dbf96983Ffdf43974c0BF7edE9fed76DF";

// Initialize web3 instance
// WalletProvider or HttpProvider
const web3 = new Web3("** Wallet **"); // window.ethereum
const Contract = new web3.eth.Contract(OTCTradeABI, amoy_contract_OTCTrade);

// 1. Cancel Order Parameters
// Parameters are retrieved from the creator's history API, located in the `f_order_info` field.

const maker = "0xA3932E6Dbf96983Ffdf43974c0BF7edE9fed76DF";
const taker = "0x0000000000000000000000000000000000000000"; // Open to all buyers

const assets = [
    {collection: "0x9A3fad316eB9cC7db65aB6f89672796574CD1B76", assetClass: "0x0000000000000000000000000000000000000721", amountOrID: "28308257", name: "Bored Ape Yacht Club", symbol: "BAYC", decimal: 0},
    {collection: "0x9A3fad316eB9cC7db65aB6f89672796574CD1B76", assetClass: "0x0000000000000000000000000000000000000721", amountOrID: "28308487", name: "Bored Ape Yacht Club", symbol: "BAYC", decimal: 0},
    {collection: "0x98700d8fF27Af5F16FdA3bE3bD30aa4585234DCa", assetClass: "0x0000000000000000000000000000000000000020", amountOrID: "100000000", name: "WBTC", symbol: "Wrapped BTC", decimal: 9},
    {collection: "0xc94BC02ecFf5f14b73fe1A3137bb587f5Fa62F5d", assetClass: "0x0000000000000000000000000000000000000020", amountOrID: "100000", name: "USDT", symbol: "Tether USD", decimal: 6}
];

const currency = [
    {collection: "0x0000000000000000000000000000000000000001", assetClass: "0x0000000000000000000000000000000000000000", amountOrID: "100000000000000000", name: "MATIC", symbol: "MATIC", decimal: 18}
];

const deadline = "1728955149"; // End of transaction validity (in seconds)
const sig = "0x65ca1ca8dc706025eb125e40e059e1b768abf909956698237d3ed9eafb276ec03ddb9ef68364652c362f245fce464a286a0fc692470d09de741404621236a4db1b"; // Signature from order creation

// 2. Initiate Cancel Order Operation
const handleCancel = Contract.methods.cancelOrder([
    maker,
    taker,
    assets.map(item => { return [item.collection, item.assetClass, item.amountOrID]; }),
    currency.map(item => { return [item.collection, item.assetClass, item.amountOrID]; }),
    deadline,
    sig
]).send({
    from: amoy_account
});

handleCancel.then(receipt => {
    console.log(receipt);
}).catch(error => {
    console.log(error);
});

Key Notes:

1. Order Parameters: The parameters for canceling the OTC order are retrieved from the creator's history API and are identical to those used when the order was created.

2. Signature: The signature sig was generated when the order was created and must be reused for cancellation.

3. Assets and Currency: Ensure that all asset and currency details match the original order to avoid issues with the cancellation.

This example demonstrates how to cancel an OTC order on the Polygon-Amoy chain. Adjust the parameters as needed based on your specific requirements.