# Hearth Markdown - Wallet Balance Lookup

> Hearth Markdown - Wallet Balance Lookup is a paid API for AI agents from 138-197-15-135.sslip.io, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-26).

Looks up the ETH balance, nonce, and contract status of a blockchain wallet address on Base, Ethereum, Arbitrum, or Optimism.

## Facts

- Endpoint: GET https://138-197-15-135.sslip.io/v1/base/wallet?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hearth-markdown-wallet-balance-lookup-f4eff18a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XAQ9f4Q2nQ5VamFI24ifN

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 hearth-markdown-wallet-balance-lookup-f4eff18a
```

Example prompt: What's the current ETH balance and nonce for wallet address 0xAbC123… on Base — and is it a contract or a regular wallet?

## When to prefer this

Use this endpoint when you need lightweight, on-chain wallet data (balance, nonce, contract status) from EVM-compatible networks (Base, Ethereum, Arbitrum, Optimism) and are comfortable paying micro-fees per call via x402/USDC. Prefer this over heavier blockchain explorer APIs when you only need account-level data rather than transaction history or token balances.

## Known failure modes

- Invalid or malformed wallet address returns an error response
- Unsupported chain value returns an error
- Network congestion on the target chain may cause slow or failed RPC calls
- Payment failure via x402 (insufficient USDC) prevents the request from completing
- Address not found on the specified chain may return zero balances

## How this service works

Web page to clean Markdown for AI agents. Pay per call with x402 (USDC on Base).

## Output

Returns a JSON object containing the wallet's ETH balance (as a decimal string and in Wei), the current block number, the account nonce, whether the address is a smart contract, the chain name, and the queried address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "queryParams"
   ],
   "properties": {
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "description": "Chain: base (default), ethereum, arbitrum, optimism"
      },
      "address": {
       "type": "string",
       "description": "Address"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "eth": "0",
  "block": 1,
  "chain": "base",
  "nonce": 0,
  "ethWei": "0",
  "address": "0x…",
  "isContract": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hearth-markdown-wallet-balance-lookup-f4eff18a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 138-197-15-135.sslip.io](https://www.zero.xyz/host/138-197-15-135.sslip.io/llms.txt)