x2y2-js

SDK for the X2Y2 protocol

https://web3w.github.io/x2y2-js

Installation

In your project, run:

npm i x2y2-js

Getting Started

To get started, create a new OpenSeaJS client, called an using your chainId and address:

import {X2Y2SDK} from 'x2y2-js'
import {Web3Wallets} from 'web3-wallets'

const {chainId, address} = new Web3Wallets({name:'metamask'})
const x2y2 = new X2Y2SDK({chainId, address},{apiKey:"xx-xx-xx"})

In the browser environment, only the chainId and address need to be configured，If you want to use the bash environment, configure the private key and RPC

type WalletInfo = {
    chainId: number;
    address: string;
    privateKeys?: string[];
    rpcUrl?: RpcInfo; // User-defined RPC information of the provider
}

type APIConfig = {
    apiKey?: string; //opensea api key
}

Advanced Settings

type WalletInfo = {
    offsetGasLimitRatio?: number; // Set the GAS limit offset of the wallet to be greater than 1 eg：1.2
}
# TODO

Fetching Assets

Assets are items on OpenSea. They can be non-fungible (conforming to standards like ERC721), semi-fungible (like ERC1155 assets), and even fungible (ERC20).

Assets are represented by the Asset type, defined in TypeScript:

/**
 * Simple, unannotated non-fungible asset spec
 */
export interface Asset {
    // The asset's token ID, or null if ERC-20
    tokenId: string | undefined;
    // The asset's contract address
    tokenAddress: string;
    // 'erc20' | 'erc721' | 'erc1155' | 'cryptokitties' | 'ensshortnameauction' | 'cryptopunks'
    schemaName: string;
    // Optional for fungible items
    name?: string;
    data?: string;
    decimals?: number;
    chainId?: number;
    collection?: {
        "royaltyFeePoints": 500,
        "royaltyFeeAddress": "0x9F7A946d935c8Efc7A8329C0d894A69bA241345A"
    };
}

The Asset type is the minimal type you need for most marketplace actions. SchemaName is optional. If omitted, most actions will assume you're referring to a non-fungible, ERC721 asset. Other options include 'ERC20' and 'ERC1155'.

You can fetch an asset using the OpenSeaAPI, which will return an OpenSeaAsset for you (OpenSeaAsset extends Asset):

 
const assetFee = await x2y2.getAssets([asset_contract_addresses])

Checking Balances and Ownerships

The nice thing about the Asset type is that it unifies logic between fungibles, non-fungibles, and semi-fungibles.

Once you have an Asset, you can see how many any account owns, regardless of whether it's an ERC-20 token or a non-fungible good:

const asset = {
    tokenId: '9',
    tokenAddress: '0xb556f251eacbec4badbcddc4a146906f2c095bee',
    schemaName: 'ERC721'
}

const balance = await x2y2.userAccount.getAssetBalances(asset, accountAddress)

You can use this same method for fungible ERC-20 tokens like wrapped ETH (WETH). As a convenience, you can use this fungible wrapper for checking fungible balances:

const balanceOfWETH = await x2y2.getTokenBalance({
    accountAddress, // string
    tokenAddress: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
})

Making Offers

Once you have your asset, you can do this to make an offer on it:

// Token ID and smart contract address for a non-fungible token:
const {tokenId, tokenAddress} = YOUR_ASSET

const offer = await x2y2.createBuyOrder({
    asset: {
        tokenId,
        tokenAddress,
        schemaName // WyvernSchemaName. If omitted, defaults to 'ERC721'. Other options include 'ERC20' and 'ERC1155'
    },
    // Value of the offer, in units of the payment token (or wrapped ETH if none is specified):
    startAmount: 1.2,
})

Making Listings / Selling Items

To sell an asset, call createSellOrder. You can do a fixed-price listing, where startAmount is equal to endAmount, or a declining Dutch auction, where endAmount is lower and the price declines until expirationTime is hit:

// Expire this auction one day from now.
// Note that we convert from the JavaScript timestamp (milliseconds):
const expirationTime = Math.round(Date.now() / 1000 + 60 * 60 * 24)

const listing = await x2y2.createSellOrder({
    asset: {
        tokenId,
        tokenAddress,
        schemaName,
        "collection": {
            royaltyFeeAddress,
            royaltyFeePoints
        }
    },
    startAmount: 3,
    // If `endAmount` is specified, the order will decline in value to that amount until `expirationTime`. Otherwise, it's a fixed-price order:
    endAmount: 0.1,
    expirationTime
})

Posting Order

// const orderStr = JSON.stringify(offer)
const orderStr = JSON.stringify(listing)
const order = await x2y2.postOrder(orderStr).catch((err: any) => {
    throw err
}) 

Fetching Orders

To retrieve a list of offers and auction on an asset, you can use an instance of the OpenSeaAPI exposed on the client. Parameters passed into API filter objects are underscored instead of camel-cased, similar to the main OpenSea API parameters:

import {OrderSide} from 'x2y2-js'

// Get offers (bids), a.k.a. orders where `side == 0` 
const query = {
    asset_contract_address: tokenAddress, //
    token_ids: [tokenId]
}
const {orders, count} = await x2y2.api.getOrders(query)

// Get page 2 of all auctions, a.k.a. orders where `side == 1`
const {orders, count} = await x2y2.api.getOrders({
    asset_contract_address: tokenAddress,
    token_ids: [tokenId],
    side: OrderSide.Sell
}, 2)

// Get Owner Orders
const {orders, count} = await x2y2.getOwnerOrders()

Buying Items

To buy an item , you need to fulfill a sell order. To do that, it's just one call:

const orders = await x2y2.api.getOrders({side: OrderSide.Sell, ...})
const tx = await x2y2.fulfillOrder(JSON.stringify(orders[0]))
console.log(tx.hash)
await tx.wait()

const orderList = [{orderStr: JSON.stringify(order[0])}, {orderStr: JSON.stringify(order[0])}]
const res = await sdk.fulfillOrders({orderList})
console.log(res.hash)
await res.wait()

Note that the fulfillOrder promise resolves when the transaction has been confirmed and mined to the blockchain. To get the transaction hash before this happens, add an event listener (see Listening to Events) for the TransactionCreated event.

If the order is a sell order (order.side === OrderSide.Sell), the taker is the buyer and this will prompt the buyer to pay for the item(s).

Accepting Offers

Similar to fulfilling sell orders above, you need to fulfill a buy order on an item you own to receive the tokens in the offer.

const orders = await x2y2.api.getOrders({side: OrderSide.Buy, ...})
const tx = await x2y2.fulfillOrder(JSON.stringify(orders[0]))
console.log(tx.hash)
await tx.wait()

If the order is a buy order (order.side === OrderSide.Buy), then the taker is the owner and this will prompt the owner to exchange their item(s) for whatever is being offered in return. See Listening to Events below to respond to the setup transactions that occur the first time a user accepts a bid.

Transferring Items or Coins (Gifting)

A handy feature in OpenSea.js is the ability to transfer any supported asset (fungible or non-fungible tokens) in one line of JavaScript.

To transfer an ERC-721 asset or an ERC-1155 asset, it's just one call:

const transactionHash = await x2y2.userAccount.transfer({
    asset: {tokenId, tokenAddress},
    fromAddress, // Must own the asset
    toAddress
})

For fungible ERC-1155 assets, you can set schemaName to "ERC1155" and pass a quantity in to transfer multiple at once:

const transactionHash = await x2y2.userAccount.transfer({
    asset: {
        tokenId,
        tokenAddress,
        schemaName: "ERC1155"
    },
    toAddress,
    quantity: 2,
})