# EVM Chain Read – Native Balance Lookup (x402)

> EVM Chain Read – Native Balance Lookup (x402) is a paid API for AI agents from chain-read.frcompanycheck.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns the native token balance (e.g. ETH) for a given address on Base (chain 8453) or Robinhood Chain (4663), paid per-call via x402 USDC micropayment.

## Facts

- Endpoint: GET https://chain-read.frcompanycheck.workers.dev/v1/%7Bchain%7D/balance/%7Baddress%7D?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-chain-read-native-balance-lookup-x402-ee1095d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AVqJ7-3kbtMOvXqYXobEy

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 evm-chain-read-native-balance-lookup-x402-ee1095d3
```

Example prompt: What's the current ETH balance for wallet 0xAbC123...on Base (chain 8453)?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call native balance check on Base or Robinhood Chain without setting up your own RPC credentials or API key. It is ideal for lightweight agents that make infrequent balance queries and want to pay only for what they use via x402 USDC micropayments on Base.

## Known failure modes

- Invalid or malformed address returns an error response
- Unsupported chain ID (anything other than 8453 or 4663) results in a 400 or unrecognized-chain error
- Insufficient x402 USDC payment causes a 402 Payment Required response
- RPC node temporarily unavailable may cause a 503 or timeout
- Address with zero balance returns balance: 0 rather than an error

## How this service works

Pay-per-call EVM reads on Base (8453) and Robinhood Chain (4663): native balance, block tip, ERC-20 meta/balance/allowance, is-contract. Public RPCs, no API key. x402 USDC on Base.

## Output

Returns a JSON object with the native token symbol (e.g. 'ETH'), the current balance as a decimal number, and the chain ID confirming which network was queried.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "ETH",
  "balance": 0.01,
  "chain_id": 8453
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-chain-read-native-balance-lookup-x402-ee1095d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain-read.frcompanycheck.workers.dev](https://www.zero.xyz/host/chain-read.frcompanycheck.workers.dev/llms.txt)