Bridge

Swap Tokens

Build a custom token swap interface that allows users to exchange tokens across chains using thirdweb Payments.

Simple Swap Component

Create a basic swap interface with token selection and amount input:


import React, { useState, useEffect } from "react";
import { Bridge } from "thirdweb";
import { useActiveAccount } from "thirdweb/react";
import { createThirdwebClient } from "thirdweb";
import { ethereum, polygon } from "thirdweb/chains";
 
const client = createThirdwebClient({
  clientId: "YOUR_CLIENT_ID",
});
 
function SwapInterface() {
  const account = useActiveAccount();
  const [fromToken, setFromToken] = useState("ETH");
  const [toToken, setToToken] = useState("MATIC");
  const [amount, setAmount] = useState("");
  const [quote, setQuote] = useState(null);
  const [isLoading, setIsLoading] = useState(false);
 
  const getQuote = async () => {
    if (!amount || !account) return;
 
    setIsLoading(true);
    try {
      const preparedQuote = await Bridge.Buy.prepare({
        originChainId: ethereum.id,
        originTokenAddress:
          "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE", // ETH
        destinationChainId: polygon.id,
        destinationTokenAddress:
          "0x0000000000000000000000000000000000001010", // MATIC
        amount: BigInt(amount * 1e18), // Convert to wei
        sender: account.address,
        receiver: account.address,
        client,
      });
      setQuote(preparedQuote);
    } catch (error) {
      console.error("Failed to get quote:", error);
    }
    setIsLoading(false);
  };
 
  useEffect(() => {
    if (amount && account) {
      const timer = setTimeout(getQuote, 500);
      return () => clearTimeout(timer);
    }
  }, [amount, account]);
 
  const executeSwap = async () => {
    if (!quote || !account) return;
 
    try {
      for (const step of quote.steps) {
        for (const transaction of step.transactions) {
          const result = await sendAndConfirmTransaction({
            transaction,
            account,
          });
 
          // Wait for cross-chain completion if needed
          if (
            ["buy", "sell", "transfer"].includes(transaction.action)
          ) {
            let swapStatus;
            do {
              swapStatus = await Bridge.status({
                transactionHash: result.transactionHash,
                chainId: transaction.chainId,
                client,
              });
              if (swapStatus.status === "PENDING") {
                await new Promise((resolve) =>
                  setTimeout(resolve, 3000),
                );
              }
            } while (swapStatus.status === "PENDING");
          }
        }
      }
 
      alert("Swap completed successfully!");
      setQuote(null);
      setAmount("");
    } catch (error) {
      console.error("Swap failed:", error);
      alert("Swap failed. Please try again.");
    }
  };
 
  return (
    <div className="max-w-md mx-auto p-6 bg-white rounded-lg shadow-lg">
      <h2 className="text-2xl font-bold mb-6 text-center">
        Token Swap
      </h2>
 
      {/* From Token */}
      <div className="mb-4">
        <label className="block text-sm font-medium mb-2">From</label>
        <div className="flex gap-2">
          <input
            type="number"
            placeholder="0.0"
            value={amount}
            onChange={(e) => setAmount(e.target.value)}
            className="flex-1 p-3 border rounded-lg focus:ring-2 focus:ring-blue-500"
          />
          <select
            value={fromToken}
            onChange={(e) => setFromToken(e.target.value)}
            className="p-3 border rounded-lg focus:ring-2 focus:ring-blue-500"
          >
            <option value="ETH">ETH</option>
            <option value="USDC">USDC</option>
            <option value="WETH">WETH</option>
          </select>
        </div>
        <p className="text-sm text-gray-500 mt-1">Ethereum</p>
      </div>
 
      {/* Swap Arrow */}
      <div className="flex justify-center mb-4">
        <button className="p-2 rounded-full bg-gray-100 hover:bg-gray-200">
          ↓
        </button>
      </div>
 
      {/* To Token */}
      <div className="mb-6">
        <label className="block text-sm font-medium mb-2">To</label>
        <div className="flex gap-2">
          <input
            type="text"
            placeholder="0.0"
            value={
              quote
                ? (Number(quote.destinationAmount) / 1e18).toFixed(6)
                : ""
            }
            readOnly
            className="flex-1 p-3 border rounded-lg bg-gray-50"
          />
          <select
            value={toToken}
            onChange={(e) => setToToken(e.target.value)}
            className="p-3 border rounded-lg focus:ring-2 focus:ring-blue-500"
          >
            <option value="MATIC">MATIC</option>
            <option value="USDC">USDC</option>
            <option value="WETH">WETH</option>
          </select>
        </div>
        <p className="text-sm text-gray-500 mt-1">Polygon</p>
      </div>
 
      {/* Quote Info */}
      {quote && (
        <div className="mb-4 p-3 bg-blue-50 rounded-lg">
          <p className="text-sm">
            <span className="font-medium">Rate:</span> 1 {fromToken} ={" "}
            {(
              Number(quote.destinationAmount) /
              Number(quote.originAmount)
            ).toFixed(6)}{" "}
            {toToken}
          </p>
          <p className="text-sm">
            <span className="font-medium">Fee:</span>{" "}
            {(
              (Number(quote.originAmount) - Number(amount) * 1e18) /
              1e18
            ).toFixed(6)}{" "}
            {fromToken}
          </p>
          <p className="text-sm">
            <span className="font-medium">Estimated time:</span>{" "}
            {Math.round(quote.estimatedExecutionTimeMs / 1000)}s
          </p>
        </div>
      )}
 
      {/* Swap Button */}
      <button
        onClick={executeSwap}
        disabled={!quote || isLoading || !account}
        className="w-full py-3 px-4 bg-blue-600 text-white rounded-lg font-medium hover:bg-blue-700 disabled:bg-gray-300 disabled:cursor-not-allowed"
      >
        {!account
          ? "Connect Wallet"
          : isLoading
            ? "Getting Quote..."
            : "Swap"}
      </button>
 
      {!account && (
        <p className="text-center text-sm text-gray-500 mt-3">
          Connect your wallet to start swapping
        </p>
      )}
    </div>
  );
}

Advanced Swap with Route Selection

Build a more sophisticated swap interface with multiple route options:


import React, { useState, useEffect } from "react";
import { Bridge } from "thirdweb";
import { useActiveAccount } from "thirdweb/react";
 
function AdvancedSwapInterface() {
  const account = useActiveAccount();
  const [routes, setRoutes] = useState([]);
  const [selectedRoute, setSelectedRoute] = useState(null);
  const [quotes, setQuotes] = useState([]);
 
  // Get available routes
  const getRoutes = async () => {
    try {
      const availableRoutes = await Bridge.routes({
        originChainId: 1, // Ethereum
        originTokenAddress:
          "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
        client,
      });
      setRoutes(availableRoutes.slice(0, 5)); // Show top 5 routes
    } catch (error) {
      console.error("Failed to get routes:", error);
    }
  };
 
  // Get quotes for multiple routes
  const getQuotes = async (amount) => {
    if (!amount || !account) return;
 
    const quotePromises = routes.map(async (route) => {
      try {
        const quote = await Bridge.Buy.prepare({
          originChainId: route.originToken.chainId,
          originTokenAddress: route.originToken.address,
          destinationChainId: route.destinationToken.chainId,
          destinationTokenAddress: route.destinationToken.address,
          amount: BigInt(amount * 1e18),
          sender: account.address,
          receiver: account.address,
          client,
        });
        return { route, quote };
      } catch (error) {
        return { route, error };
      }
    });
 
    const results = await Promise.all(quotePromises);
    setQuotes(results.filter((result) => result.quote));
  };
 
  useEffect(() => {
    getRoutes();
  }, []);
 
  return (
    <div className="max-w-2xl mx-auto p-6">
      <h2 className="text-2xl font-bold mb-6">Advanced Token Swap</h2>
 
      {/* Amount Input */}
      <div className="mb-6">
        <input
          type="number"
          placeholder="Enter amount to swap"
          onChange={(e) => getQuotes(e.target.value)}
          className="w-full p-3 border rounded-lg focus:ring-2 focus:ring-blue-500"
        />
      </div>
 
      {/* Route Options */}
      <div className="space-y-3">
        <h3 className="text-lg font-medium">Available Routes</h3>
        {quotes.map(({ route, quote }, index) => (
          <div
            key={index}
            className="border rounded-lg p-4 hover:bg-gray-50 cursor-pointer"
            onClick={() => setSelectedRoute({ route, quote })}
          >
            <div className="flex justify-between items-center">
              <div>
                <p className="font-medium">
                  {route.originToken.symbol} →{" "}
                  {route.destinationToken.symbol}
                </p>
                <p className="text-sm text-gray-500">
                  {route.originToken.name} to{" "}
                  {route.destinationToken.name}
                </p>
              </div>
              <div className="text-right">
                <p className="font-medium">
                  {(
                    Number(quote.destinationAmount) /
                    Math.pow(10, route.destinationToken.decimals)
                  ).toFixed(6)}
                </p>
                <p className="text-sm text-gray-500">
                  ~{Math.round(quote.estimatedExecutionTimeMs / 1000)}
                  s
                </p>
              </div>
            </div>
          </div>
        ))}
      </div>
 
      {selectedRoute && (
        <div className="mt-6 p-4 bg-blue-50 rounded-lg">
          <h4 className="font-medium mb-2">Selected Route</h4>
          <p>
            {selectedRoute.route.originToken.symbol} →{" "}
            {selectedRoute.route.destinationToken.symbol}
          </p>
          <button
            onClick={() => executeSwap(selectedRoute.quote)}
            className="mt-3 w-full py-2 px-4 bg-blue-600 text-white rounded-lg hover:bg-blue-700"
          >
            Execute Swap
          </button>
        </div>
      )}
    </div>
  );
}

View it in action:

Token Swap Playground

Try building and testing swap interfaces with live data

Key Features

Cross-chain swaps - Exchange tokens across 50+ supported chains
Real-time quotes - Get up-to-date pricing and execution estimates
Route optimization - Find the best path for any token pair
Price comparison - Compare multiple routes to maximize output
Status tracking - Monitor cross-chain transaction progress

Gas Optimization Tip: For frequently traded pairs, consider caching route data to reduce API calls and improve UI responsiveness.

Going Further

Send a Payment - Learn about peer-to-peer transfers
Get Routes - Explore route discovery APIs
Token Prices - Access real-time token pricing
Webhooks - Get notified when swaps complete