Swaps from Tron

Connecting a Web3 Wallet and Executing a Transaction through Rubic API

This page explains how to connect a Web3 wallet, retrieve token quotes, approve tokens, and execute a transaction using Rubic API, with examples using ethers.js, web3.js, and viem

Connecting a Web3 Wallet

To interact with the blockchain, we first need to connect a wallet. Here are examples using tronWeb.

const TronWeb = require('tronweb');

async function connectWallet() {
    if (window.tronLink) {
        const response = await window.tronLink.request({ method: 'tron_requestAccounts' });
       return window.tronLink.tronWeb.defaultAddress.base58;
    } else {
        console.error("Tron provider not found. Please install TronLink.");
    }
}

Retrieving Token Quotes

Now that the wallet is connected, we can request token quotes from Rubic API.

Endpoint: POST https://api-v2.rubic.exchange/api/routes/quoteBest

async function quoteBest() {
    const response = await fetch("https://api-v2.rubic.exchange/api/routes/quoteBest", {
        method: "POST",
        headers: {
            "Content-Type": "application/json",
        },
        body: {
            "srcTokenAddress": "0x0000000000000000000000000000000000000000",
            "srcTokenAmount": "1000.05",
            "srcTokenBlockchain": "TRON",
            "dstTokenAddress": "0x0000000000000000000000000000000000000000",
            "dstTokenBlockchain": "ETH",
            "referrer": "rubic.exchange"
          }
    });
    const data = await response.json();
    const { estimate, transaction, id } = data;
    console.log(estimate);
    // {
    //     This is an estimated amount you will get after the swap.
    //     "destinationTokenAmount": "8248.453781656313882666",
    //     "destinationTokenMinAmount": "8001.000168206624466186",
    //
    //     "destinationUsdAmount": 2637.13,
    //     "destinationUsdMinAmount": 2558.02,
    //
    //     "destinationWeiAmount": "8248453781656313882666",
    //     "destinationWeiMinAmount": "8001000168206624466186",
    //
    //     "durationInMinutes": 5,
    //     "priceImpact": 0.14,
    //     "slippage": 0.03
    // }
    console.log(transaction.approvalAddress);
    // This is the address you need to give approve to spend tokens.
    // See next section for details.
    // TMmBsvNipjm4VTqt5gydp72i7Facbzk1Ee
    console.log(id);
    // This is the swap ID. It will be needed later for swap request.
    return data;
}

You get more information about quote endpoint here:

Request Quote

Approving Tokens for Transaction

Before sending a transaction, you need to approve the token. Approve allows a user to authorize a contract or application to manage a specified amount of their tokens, which is necessary for secure interaction with decentralized applications such as exchanges or DeFi protocols. This gives users control over how many tokens can be used, providing an additional layer of security.

Below are examples for different libraries.

const tronWeb = require('tronweb');
import { TRC20_CONTRACT_ABI } from "./TokenABI"; // replace with the correct ABI

async function approveToken(
    // Token address
    tokenAddress,
    // Contract to give approve to.
    // Put here transaction.approvalAddress obtained on previous step
    spenderAddress,
    // Amount of tokens to approve.
    // For security reasons it's better to set approve
    // amount equal to from amount
    amount
) {
    const contract = await tronWeb.contract(TRC20_CONTRACT_ABI, tokenAddress);
    const tx = await tokenContract.approve(spenderAddress, amount);
    console.log("Approval successful:", tx.hash);
}

Retrieving Data to Execute a Transaction

To perform a token swap through Rubic API, we need to get the necessary data for the transaction.

Endpoint: POST https://api-v2.rubic.exchange/api/routes/swap

async function getSwapData() {
    const response = await fetch("https://api-v2.rubic.exchange/api/routes/swap", {
        method: "POST",
        headers: {
            "Content-Type": "application/json",
        },
        body: {
            "srcTokenAddress": "0x0000000000000000000000000000000000000000",
            "srcTokenAmount": "1000.05",
            "srcTokenBlockchain": "TRON",
            "dstTokenAddress": "0x0000000000000000000000000000000000000000",
            "dstTokenBlockchain": "ETH",
            "referrer": "rubic.exchange"
            "fromAddress": "USER WALLET ADDRESS",
            "id": "ID FROM QUOTE STEP",
            "receiver": "RECEIVER ADDRESS"
          }
    });
    const result = await response.json();
    const { transaction } = result;
    console.log(transaction);
    // EXAMPLE WITH RANDOM VALUES, don't supposed to be as a response for TRON->ETH swap
    // {
    //     "approvalAddress": "TMmBsvNipjm4VTqt5gydp72i7Facbzk1Ee",
    //     "arguments": [<called method arg 1>, <called method arg 1>, ...],
    //     "signature": "06fdde03",
    //     "to": "TMmBsvNipjm4VTqt5gydp72i7Facbzk1Ee",
    //     "rawParameter"?: "0a020add22086c2763abadf9ed2940c8d5deea822e5a65080112610a2d747970652e676f6f676c65617069732e636f6d2f70726f746f636f6c2e5472616e73666572436f6e747261637412300a15418840e6c55b9ada326d211d818c34a994aeced808121541d3136787e667d1e055d2cd5db4b5f6c880563049186470ac89dbea822e",
    //     "callValue"?: "1138554300",
    //     "feeLimit"?: 10000000000
    // },
    return result;
}

You get more information about swap endpoint here:

Request Data

Executing a Transaction with the API Response Data

Using the data obtained from the Rubic API, you can now execute the transaction.

async function executeSwap(
    // Signer object, obtained while ethers.js initializing
    tronWeb,
    // User wallet address
    fromAddress
    // Address of called contract
    contractAddress: string,
    // Method selector
    methodSignature: string,
    // tx arguments array
    parameters: Array<{type: string; value: string | TronParameters;}>,
    // tx options
    options: {feeLimit?: number; callValue?: string; rawParameter?: string;}
) {
    const tronTx = await tronWeb.transactionBuilder.triggerSmartContract(
        contractAddress,
        methodSignature,
        options,
        parameters,
        fromAddress
    );
    const signedTransaction = await tronWeb.trx.sign(tronTx.transaction);

    const receipt: TronTransactionReceipt = await this.tronWeb.trx.sendRawTransaction(
        signedTransaction
    return receipt.txid;
}

Track your transaction

Now you can track your transaction status

Endpoint: GET https://api-v2.rubic.exchange/api/routes/status

async function getStatus(
    // Your transaction hash, otained while executing transaction
    hash
) {
    const response = await fetch(`https://api-v2.rubic.exchange/api/info/status?srcTxHash=${hash}`);
    const data = await response.json();
    const { status, destinationTxHash } = data;
    console.log(status);
    // Current TX status can be one of
    // 'PENDING' | 'LONG_PENDING' | 'REVERT' |
    // 'REVERTED' | 'FAIL' | 'READY_TO_CLAIM' |
    // 'SUCCESS' | 'NOT_FOUND';
    console.log(status);
    // shows the hash on the target network if the transaction
    // is successfully completed
    return status;
}

You get more information about status endpoint here:

Get Cross-Chain Status