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Documentation Index

Fetch the complete documentation index at: https://docs.cloud.coinbase.com/llms.txt

Use this file to discover all available pages before exploring further.

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Overview

The CDP SDK allows you to retrieve token balances of an address using the listTokenBalances method for Base. For Solana token balances, use the REST API directly. Additional information can be found in our SDK Reference. In this guide, you will learn how to retrieve ERC-20 and native gas token balances of an address on Base networks.

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Prerequisites

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Configure

1

Install dependencies

npm install @coinbase/cdp-sdk dotenv
2

Create an .env file

Create a .env file in your project root:
touch .env
3

Add API credentials

If you downloaded your CDP API key as a JSON file, it will look like this. Otherwise, you can copy the values directly from the CDP Portal:
{
  "id": "3008043e-4528-46b7-82ff-111111111111",
  "privateKey": "a-long-base64-encoded-string"
}
Copy these values into your .env file:
CDP_API_KEY_ID=3008043e-4528-46b7-82ff-111111111111
CDP_API_KEY_SECRET=a-long-base64-encoded-string

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Example

In the example below, we query token balances for a known exchange address on Base mainnet. 
import { CdpClient } from "@coinbase/cdp-sdk";
import "dotenv/config";

const cdp = new CdpClient();

// Check token balances for a known exchange wallet with many tokens
const walletAddress = "0x835678a611b28684005a5e2233695fb6cbbb0007";
const network = "base";  // Base mainnet

const result = await cdp.evm.listTokenBalances({
  address: walletAddress,
  network: network,
});

console.log(`Checking wallet: ${walletAddress}`);
console.log(`Network: ${network}\n`);

result.balances.forEach((item) => {
  // Token amounts are stored as large integers on-chain
  // We divide by 10^decimals to get the human-readable amount
  const readableAmount = Number(item.amount.amount) / Math.pow(10, item.amount.decimals);
  
  // The address 0xEeee... represents native ETH (not an ERC-20 token)
  if (item.token.contractAddress === '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE') {
    console.log(`ETH: ${readableAmount.toFixed(6)}`);
  } else {
    console.log(`Token: ${readableAmount.toFixed(2)} (contract: ${item.token.contractAddress})`);
  }
});
After running the snippet above, you should see the following output: 
Checking wallet: 0x835678a611b28684005a5e2233695fb6cbbb0007
Network: base

Token: 150.00 (contract: 0x1198CabDb2b9fF79EC8CbaFfB8977DAF74AFa25a)
Token: 87331987.01 (contract: 0x6D51bC9d512072B6399B81c73F02ba935B2771e5)
Token: 11000.00 (contract: 0x260b9AC75753FbD67F2Ea6D10724dd89a52C1913)
Token: 1261267.05 (contract: 0x3A95F48Cb4c04Eb0EC2a54d72DAA9e1138D9238d)
Token: 2900.00 (contract: 0x1aD2449781a03197BD6A072598Ac311B8bA1f5BD)
Token: 3086.69 (contract: 0xd6e03dEd9Cf9213b207E69570561E08cc3BC681e)
This output shows:
  • Token balances: Each ERC-20 token with its amount and contract address
  • Contract addresses: The long hex strings identify each specific token contract on Base mainnet
  • Large holdings: This exchange wallet holds millions of various tokens

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Sample response

The token balance response provides detailed token information: 
{
  "balances": [
    {
      "token": {
        "network": "base",
        "symbol": "ETH",
        "name": "Ether",
        "contractAddress": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"
      },
      "amount": {
        "amount": "1250000000000000000",
        "decimals": 18
      }
    }
  ],
  "nextPageToken": "..."
}

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Response fields

FieldDescription
balancesThe list of EVM token balances.
amountAmount of a given token in JSON format, includes amount, denominated in the smallest indivisible unit of the token; and decimals.
tokenGeneral information about a token in JSON format.
networkName of the blockchain network, e.g. base.
symbolThe symbol of the ERC-20 or native gas token, e.g. ETH.
nameThe name of the ERC-20 or native gas token, e.g. Ether.
contractAddressAddress of the ERC-20 or native gas token smart contract.
nextPageTokenThe token for the next page of items, if any.

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Pagination

listTokenBalances supports paginated responses for addresses with many balances: 
import { CdpClient } from "@coinbase/cdp-sdk";

const cdp = new CdpClient();

const page = await cdp.evm.listTokenBalances({
  address: "0x835678a611b28684005a5e2233695fb6cbbb0007",
  network: "base",
  pageSize: 5
});

const nextPage = await cdp.evm.listTokenBalances({
  address: "0x835678a611b28684005a5e2233695fb6cbbb0007",
  network: "base",
  pageToken: page.nextPageToken
});