Wallet token balances (indexed)

All token balances for any address in one call, from Coinbase's indexed data API - ERC-20 + native on EVM, SPL on Solana; no per-token contract calls, no RPC wrangling. Send GET /api/wallet-balances with the required field address and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with address, network, balances and count.

Networks: base, ethereum, base-sepolia, solana, solana-devnet. Symbols/decimals populated for whitelisted tokens (USDC always included).

Category: Wallet operations · Tags: cdp coinbase wallet onboarding x402 agent-wallet balances erc-20

TRY IN PLAYGROUND →

Parameters

Example request

curl -i "https://agent402.tools/api/wallet-balances?address=0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0&network=base"

Without payment this returns HTTP 402 Payment Required with the exact price for wallet-balances; any x402 v2 or MPP client pays it and retries.

Example response

{
  "address": "0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0",
  "network": "base",
  "balances": [
    {
      "symbol": "USDC",
      "name": "USD Coin",
      "contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "amount": "8.655",
      "raw": "8655000",
      "decimals": 6
    }
  ],
  "count": 1
}

From an MCP client

catalog.call {
  "slug": "wallet-balances",
  "params": {
    "address": "0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0",
    "network": "base"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for wallet-balances; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• address is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged: settlement is cancelled when the tool fails.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/wallet-balances is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again.

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/wallet-balances?address=0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0&network=base");

Part of these workflows

Wallet token balances (indexed) is one step in this skill pack, each sold as a single call:

• Agent wallet readiness check - One call answers 'can this wallet pay right now?' - USDC balances on Base AND Solana, live Base gas, and a ready-to-share Coinbase Onramp funding link if it's running dry.

Related tools