# Base Address Inspector

> Base Address Inspector is a paid API for AI agents from automaton-tx-explainer.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).

Inspects a Base mainnet address and returns its type, token standards, proxy details, ETH balance, and a human-readable summary.

## Facts

- Endpoint: GET https://automaton-tx-explainer.vercel.app/v1/base/address?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-address-inspector-05e5c419
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_au4lESFmKWxwPpvxE-neg

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-inspector-05e5c419
```

Example prompt: What kind of address is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Base mainnet — is it a contract or a wallet, and if it's a contract, what token does it represent and is it a proxy?

## When to prefer this

Choose this endpoint when you need a quick, structured breakdown of any Base mainnet address — whether it's an EOA, a token contract, or a proxy — including balance and ERC-20 metadata, all in a single call. Prefer it over raw RPC calls when you want a pre-parsed, human-readable summary without writing custom ABI decoding logic.

## Known failure modes

- Invalid address format (not matching ^0x[0-9a-fA-F]{40}$) — request rejected before payment
- Address not found or RPC node unavailable — upstream error
- Payment failure via x402 — 402 response if USDC payment not completed
- Rate limiting or Vercel cold-start latency causing timeout

## How this service works

Inspect any Base address: EOA vs contract vs EIP-7702 delegated, ETH balance, nonce, proxy implementation (EIP-1967/1167/zos), and ERC-20 name/symbol/decimals/supply.

## Output

Returns a JSON object containing the address type (EOA or contract), optional ERC-20 metadata (name, symbol, decimals), optional proxy information (standard and implementation address), the ETH balance in wei, and a concise human-readable summary string combining all findings.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Base address (EOA or contract)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "type": "contract",
  "erc20": {
   "name": "USD Coin",
   "symbol": "USDC",
   "decimals": 6
  },
  "proxy": {
   "standard": "EIP-1967",
   "implementation": "0x..."
  },
  "summary": "contract (EIP-1967 proxy) · ERC-20 USDC · 0 ETH",
  "ethBalance": "0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-address-inspector-05e5c419/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from automaton-tx-explainer.vercel.app](https://www.zero.xyz/host/automaton-tx-explainer.vercel.app/llms.txt)