Native and USDC balance API across 5 EVM networks

$0.005 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Read a wallet's native coin and USDC balances on Base, Ethereum, Arbitrum, Optimism and Polygon in one call, live from each network, plus the USDC total. Use to find where a wallet's funds are before a payment or bridge; for one token on one network use <chain>_token_balance, for all tokens on Base use wallet_portfolio. A network whose nodes do not answer is listed with an error instead of failing the call.

When to use it

Check an address's ETH/POL and USDC on Base, Ethereum, Arbitrum, Optimism and Polygon in one call
Confirm a wallet is funded before a payment
Monitor treasury or bot wallets

Guide: Wallet balance API, multi-chain

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Inputs

Name	Type	Description
`address` (required)	string	0x wallet address

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/wallet/balances?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/wallet/balances?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "usdcTotal": "12.5",
  "networks": [
    {
      "chain": "Base",
      "chainId": 8453,
      "native": "0.0123",
      "nativeSymbol": "ETH",
      "usdc": "12.5",
      "error": null
    }
  ]
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is wallet_balances, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

Which networks?

Base, Ethereum, Arbitrum, Optimism and Polygon.

How do I pay?

Each successful call costs $0.005; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.