Reward Kit is still in early alpha, and may contain bugs or unexpected behavior.
The Boost V2 Docs are under active development and will be subject to changes.
A React hook that fetches and tracks token balances specifically for tokens used in active and featured RewardKit Boosts. The hook automatically filters and sorts balances based on incentive asset addresses.
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props
object
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Return Value
object

useRewardKitBalances TSDoc

See in-depth technical documentation

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Basic Usage

Here’s a simple example showing how to display token balances: 
import { useRewardKitBalances } from '@boostxyz/reward-kit-react';

function TokenBalanceList() {
  const { balances, isPending, error } = useRewardKitBalances({
    address: "0x123..." // User's wallet address
  });

  if (isPending) {
    return <div>Loading balances...</div>;
  }

  if (error) {
    return <div>Error: {error.message}</div>;
  }

  return (
    <div>
      <h2>Your Token Balances</h2>
      <ul>
        {balances.map((balance) => (
          <li key={balance.address}>
            {balance.symbol}: {balance.amount}
            <span>(${balance.amountUsd})</span>
          </li>
        ))}
      </ul>
    </div>
  );
}

​
Advanced Implementation

Here’s a more comprehensive example showing balance tracking with formatting: 
import { useRewardKitBalances } from '@boostxyz/reward-kit-react';
import { formatUnits } from 'viem';

function TokenBalanceTracker() {
  const {
    balances,
    isPending,
    error
  } = useRewardKitBalances({
    address: "0x123..."
  });

  // Format currency values
  const formatUsd = (value: string) => {
    return new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: 'USD'
    }).format(Number(value));
  };

  // Handle different states
  if (isPending) {
    return <div>Fetching token balances...</div>;
  }

  if (error) {
    return (
      <div className="error">
        Failed to load balances: {error.message}
      </div>
    );
  }

  if (balances.length === 0) {
    return <div>No relevant token balances found</div>;
  }

  return (
    <div className="balance-container">
      <h2>Token Balances</h2>
      <table>
        <thead>
          <tr>
            <th>Token</th>
            <th>Balance</th>
            <th>Value (USD)</th>
          </tr>
        </thead>
        <tbody>
          {balances.map((balance) => (
            <tr key={balance.address}>
              <td>{balance.symbol}</td>
              <td>{balance.amount}</td>
              <td>{formatUsd(balance.amountUsd)}</td>
            </tr>
          ))}
        </tbody>
        <tfoot>
          <tr>
            <td colSpan={2}>Total Value:</td>
            <td>
              {formatUsd(
                balances.reduce((sum, b) =>
                  sum + Number(b.amountUsd), 0
                ).toString()
              )}
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
  );
}

​
With Real-time Updates

Example showing how to implement real-time balance updates: 
import { useRewardKitBalances } from '@boostxyz/reward-kit-react';
import { useEffect, useState } from 'react';

function RealTimeBalances() {
  const [lastUpdate, setLastUpdate] = useState(new Date());
  const {
    balances,
    isPending,
    refetch
  } = useRewardKitBalances({
    address: "0x123..."
  });

  // Refresh balances every 30 seconds
  useEffect(() => {
    const interval = setInterval(() => {
      refetch();
      setLastUpdate(new Date());
    }, 30000);

    return () => clearInterval(interval);
  }, [refetch]);

  return (
    <div>
      <div className="header">
        <h2>Live Token Balances</h2>
        <small>
          Last updated: {lastUpdate.toLocaleTimeString()}
        </small>
      </div>

      {isPending ? (
        <div>Refreshing balances...</div>
      ) : (
        <ul>
          {balances.map((balance) => (
            <li key={balance.address}>
              <strong>{balance.symbol}</strong>
              <div>Amount: {balance.amount}</div>
              <div>Value: ${balance.amountUsd}</div>
            </li>
          ))}
        </ul>
      )}
    </div>
  );
}
The hook automatically integrates with RewardKit’s configuration through RewardKitProvider and filters balances to only show tokens relevant to the configured boosts. It also handles multi-chain scenarios by tracking balances across all chains where boosts are active.