Best Practice

Transferring token example

Step 1: Get Token Info

You can call the get Token List API to get all the available tokens we have on the blockchain you choose.

• Method: Get

• URL: https://api.0xgen.io/v1/:chain/tokenList

• Parameters:

parameter	type	example	description
chain	string	bsc	eth, bsc, polygon, avax, arbitrum, fantom, xdai, moonriver, aurora, cronos, harmony, solana, sifchain, osmosis, optimism, ont, tron, okex, zksync, linea, scroll

Your request will look like this:

 async tokenList() {
    const { data } = axios.get('https://api.0xgen.io/v1/bsc/tokenList');
 }

And your response will look like this:

{  "code": 200,
    "data": [
        {
            "id": 2048,
            "code": "ezeth",
            "name": "Renzo Restaked ETH",
            "address": "0x2416092f143378750bb29b79eD961ab195CcEea5",
            "decimals": 18,
            "symbol": "ezETH",
            "icon": "https://s3.0xgen.io/logos/1720409237571_35144943543615725.png",
            "chain": "bsc",
            "createtime": "2024-07-08T03:27:21.000Z",
            "hot": null,
            "sort": "2024-07-08T03:27:21.000Z",
            "chainId": null,
            "usd": null
        },...]
}

Then you pick up the token you choose in the specific chain which is included. You need to save the token information you need for further operations

Step 2: Quote

You can obtain quotes from different platforms.

• Method: Get

• URL: https://api.0xgen.io/v1/:chain/quote
• Parameters:

  parameter	type	example	description
  chain	string	bsc	eth, bsc, polygon, avax, arbitrum, fantom, xdai, moonriver, aurora, cronos, harmony, solana, sifchain, osmosis, optimism, ont, tron, okex, zksync, linea, scroll
  inTokenAddress	string	0x783C08b5F26E3daf8C4681F3bf49844e425b6393	token address
  outTokenAddress	string	0xD81D45E7635400dDD9c028839e9a9eF479006B28	out token address
  amount	string	5	token amount(without decimals)
  gasPrice	string	1	without decimals

Your request will be like this

   let params = {
        inTokenAddress: '0x9029FdFAe9A03135846381c7cE16595C3554e10A',
        outTokenAddress: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE',
        amount: 5,
        gasPrice: 1,
        };
   async quote(){
      const { data } = await axios.get('https://api.0xgen.io/v1/bsc/quote', {params})
   }

And your response will look like this:

  {
    "code": 200,
    "data": {
        "dexes": [
            {
                "name": "openOcean",
                "amount": "1614773503060146858429"
            },
            {
                "name": "1inch",
                "amount": "1614222924617714762008"
            }
        ],
        "maxOutAmount": "1614773503060146858429",
        "minOutAmount": "1614222924617714762008",
        "inToken": {
            "symbol": "BNB",
            "name": "Binance Coin",
            "address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
            "decimals": 18
        },
        "outToken": {
            "symbol": "1INCH",
            "name": "1INCH Token",
            "address": "0x111111111117dc0aa78b770fa6a738034120c302",
            "decimals": 18
        },
        "inAmount": "5000000000000000000"
    }
}

Step 3: Obtain on-chain transaction data.

You can obtain the on-chain transaction data from a specified platform.

• Method: Get

• URL: https://api.0xgen.io/v1/:chain/:dex/swap_quote
• Parameters:

  parameter	type	example	description
  chain	string	bsc	eth, bsc, polygon, avax, arbitrum, fantom, xdai, moonriver, aurora, cronos, harmony, solana, sifchain, osmosis, optimism, ont, tron, okex, zksync, linea, scroll
  dex	string	openOcean	openOcean, 1inch, paraSwap, matcha, jupiter, 1sol
  inTokenAddress	string	0x783C08b5F26E3daf8C4681F3bf49844e425b6393	token address
  outTokenAddress	string	0xD81D45E7635400dDD9c028839e9a9eF479006B28	out token address
  amount	string	5	token amount(without decimals)
  gasPrice	string	5	without decimals
  slippage	number	1	1 equals 1%, 1%-100%
  account	string		user's address
  disableEstimate	boolean	true	true/false(check balance and allowance)
  referrer	string?	0x0000000000000000000000000000000000000000	Please contact us for a unique referrer parameter

For example, you want to use openocean to obtain the on-chain transaction data;

{
    let params = {
        inTokenAddress: '0x9029FdFAe9A03135846381c7cE16595C3554e10A',
        outTokenAddress: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE',
        amount: 5,
        gasPrice: 1,
        slippage:100,
        account: ''// wallet address
        };
    const res = await axios.get('https://api.0xgen.io/v1/bsc/openOcean/swap_quote', {params})
}

response:

If you call it right, you will get a result like this:

{
    "code": 200,
    "data": {
        "inToken": {
            "symbol": "BNB",
            "name": "Binance Coin",
            "address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
            "decimals": 18
        },
        "outToken": {
            "symbol": "USDT",
            "name": "Binance-Peg USD (T)",
            "decimals": 18,
            "address": "0x55d398326f99059ff775485246999027b3197955"
        },
        "inAmount": "5000000000000000",
        "outAmount": "1533988843342961506",
        "estimatedGas": "198245",
        "minOutAmount": "1518648954909531891",
        "from": "0x929B44e589AC4dD99c0282614e9a844Ea9483C69",
        "to": "0x6352a56caadC4F1E25CD6c75970Fa768A3304e64",
        "value": "5000000000000000",
        "gasPrice": "5000000000",
        "data": ""
    }
    }

sendTransaction

Here is a case for you to make a transaction on BNB Chain.

import { ethers } from "ethers";
import axios from "axios";
async function swap() {
    const account = ''; // wallet address;
    const private_key = ''; //private key;
    const provider = new ethers.providers.JsonRpcProvider('');
    const wallet = new ethers.Wallet(private_key, provider);
    let params = {
        inTokenAddress: '0x9029FdFAe9A03135846381c7cE16595C3554e10A',
        outTokenAddress: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE',
        amount: 5,
        gasPrice: 1,
        slippage: 100,
        account// wallet address
    };
    const res = await axios.get("https://api.0xgen.io/v1/bsc/openOcean/swap_quote", { params });
    if (res) {
​
        const { estimatedGas, data, gasPrice } = res.data.data;
        const swapParams = {
            from: '', // wallet address
            to: '0x6352a56caadc4f1e25cd6c75970fa768a3304e64', //Please use the contract from the contract page
            gas: estimatedGas,
            gasPrice: gasPrice,
            data
        };
​
        if (isNativeToken(params.inTokenAddress.toLowerCase())) {
            swapParams.value = ethers.BigNumber.from(res.data.value);
        }
​
        const { hash } = await wallet.sendTransaction(swapParams)
    } else {
        return
    }
}