# Base Address Summary

> Base Address Summary is a paid API for AI agents from heb-utils-x402.hebutils-api.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Returns an on-chain summary of a Base network address including ETH balance, USDC balance, transaction count, and whether it is a contract

## Facts

- Endpoint: GET https://heb-utils-x402.hebutils-api.workers.dev/base-address-summary?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-address-summary-eb5ec72f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NfAlfa7J8jw0QsEtFugGx

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 base-address-summary-eb5ec72f
```

Example prompt: Can you pull up the on-chain summary for the Base address 0x1234...abcd — I want to see its ETH balance, USDC balance, transaction count, and whether it's a smart contract?

## When to prefer this

Choose this endpoint when you need a quick, affordable ($0.005 USDC) on-chain summary of a Base network address covering ETH balance, USDC balance, transaction count, and contract status — particularly when screening counterparties, auditing wallets, or enriching address data without needing a full-featured blockchain explorer API.

## Known failure modes

- Invalid or malformed address string returns an error
- Address not found on Base network may return zero values
- Network or RPC node outages could cause timeout errors
- Missing required 'address' query parameter returns a 400-level error

## How this service works

Pay-per-call utility APIs in USDC on Base: Hebrew calendar and text tools, Shabbat times, Base token control-risk screen and address summary, plus finance arithmetic tools. General information and arithmetic only; not investment, tax or legal advice and not a recommendation to buy, sell or hold anything.

## Output

A JSON object containing: chain name ('base'), transaction count (integer), ETH balance (string), USDC balance (string), and a boolean flag indicating whether the address is a smart contract.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "tx_count": 0,
  "eth_balance": "0",
  "is_contract": false,
  "usdc_balance": "0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-address-summary-eb5ec72f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from heb-utils-x402.hebutils-api.workers.dev](https://www.zero.xyz/host/heb-utils-x402.hebutils-api.workers.dev/llms.txt)