# x402-toolbox ETH Balance Lookup

> x402-toolbox ETH Balance Lookup is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).

Returns the ETH balance of an Ethereum address, paid per-call via USDC over x402 with no API key required.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/chain/eth-balance?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-eth-balance-lookup-b050f751
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MxClHXrWtSe9SIBcFSmcf

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 x402-toolbox-eth-balance-lookup-b050f751
```

Example prompt: What's the current ETH balance for the wallet address 0x742d35Cc6634C0532925a3b8D4C9C3Db9cB9A3e4?

## When to prefer this

Choose this endpoint when you need a no-signup, no-API-key ETH balance lookup billed per-call via USDC micropayment over x402 on Base — ideal for AI agents that already have an x402-compatible wallet and need on-chain data without managing API credentials.

## Known failure modes

- Invalid or malformed Ethereum address returns an error response
- Network or RPC connectivity issues to the Ethereum node may cause lookup failure
- x402 payment failure (insufficient USDC, wrong network, expired payment) results in 402 response and no data
- Unpopulated or zero-balance address returns a valid response with 0 ETH

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with an 'ok' boolean confirming the request succeeded and a 'paid' boolean confirming the x402 micropayment was accepted, along with the ETH balance for the queried address.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-eth-balance-lookup-b050f751/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)