# Tollkit Chain Balance

> Tollkit Chain Balance is a paid API for AI agents from extract.tollkit.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Returns the native ETH balance plus USDC, USDT (Ethereum), and up to 20 additional ERC-20 tokens for a given wallet or contract address on Base, Ethereum, or Solana, read live from the chain.

## Facts

- Endpoint: POST https://extract.tollkit.dev/chain/balance?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tollkit-chain-balance-a313434c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2mX53zB8d_x0IYSCUzUAu

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tollkit-chain-balance-a313434c -d '<json body>'
```

Example prompt: What's the ETH and USDC balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum, and also check its holdings for the USDT contract 0xdAC17F958D2ee523a2206206994597C13D831ec7?

## When to prefer this

Choose this endpoint when you need live, on-chain balance data for a wallet across Base, Ethereum, or Solana, especially when you want native ETH plus stablecoins (USDC/USDT) and custom ERC-20 holdings in a single call. Prefer this over block explorer APIs when you want pay-per-call pricing with no API key, or when you need decimals already applied. Not suitable for historical balances, NFT holdings, or transaction history.

## Known failure modes

- Invalid address format returns an error without charging the $0.002 fee
- RPC node failure or chain unavailability returns an error without charging
- Requesting more than 20 extra token contracts returns a validation error
- Providing a Solana address format for an EVM chain (or vice versa) may return an error
- Unknown or unverified ERC-20 contract addresses may return zero balance or missing metadata

## How this service works

Wallet balance on Base or Ethereum: give an address, get its native ETH plus USDC (and USDT on Ethereum), and any other ERC-20 tokens you list (up to 20), with symbols and decimals applied. Read live from the chain. $0.002 per call; a bad address or an RPC failure is not charged.

## Output

Returns the wallet's native balance (ETH or SOL) and balances for USDC, USDT (on Ethereum), plus any additional ERC-20 or SPL token contracts specified, with each token's symbol and decimals already applied so amounts are human-readable. Data is read live from the chain at time of request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "base",
    "ethereum",
    "solana"
   ],
   "type": "string",
   "default": "base",
   "description": "Which chain to read: \"base\" (default), \"ethereum\" or \"solana\"."
  },
  "tokens": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^(0x[0-9a-fA-F]{40}|[1-9A-HJ-NP-Za-km-z]{32,44})$"
   },
   "maxItems": 20,
   "description": "Extra ERC-20 contracts (or SPL mints on Solana) to include."
  },
  "address": {
   "type": "string",
   "pattern": "^(0x[0-9a-fA-F]{40}|[1-9A-HJ-NP-Za-km-z]{32,44})$",
   "description": "Wallet (or contract) address to check."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tollkit-chain-balance-a313434c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from extract.tollkit.dev](https://www.zero.xyz/host/extract.tollkit.dev/llms.txt)