# Base Address Snapshot Lookup

> Base Address Snapshot Lookup is a paid API for AI agents from agenttoll-pi.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns ETH balance, transaction count, and account type (contract or EOA) for a given Base network address

## Facts

- Endpoint: GET https://agenttoll-pi.vercel.app/api/base/address/:address
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-address-snapshot-lookup-a2042fc9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NwyHSjfR-mso5pbu-rb79

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-snapshot-lookup-a2042fc9
```

Example prompt: Can you pull up the onchain snapshot for Base address 0x742d35Cc6634C0532925a3b8D4C9C0583c0fF9E — I want to know its ETH balance, how many transactions it's made, and whether it's a smart contract or a regular wallet.

## When to prefer this

Use this endpoint when you need a quick, single-call summary of a Base network address — specifically when you want ETH balance, transaction count, and contract/EOA classification in one shot without querying a block explorer manually. Prefer this over general blockchain APIs when you're working specifically on the Base L2 and need low-latency, pay-per-call access without API key setup.

## Known failure modes

- Invalid address format (not a 0x-prefixed 40-hex-char string) returns a validation error
- Address not found or never used on Base may return zero values for balance and tx count
- RPC or node connectivity issues may cause 5xx errors
- Payment failure (x402) if USDC balance is insufficient blocks the request
- Rate limiting if too many requests are made in a short window

## How this service works

Base address snapshot: ETH balance, tx count, contract or EOA

## Output

Returns a JSON object containing the ETH balance of the address, its total transaction count on Base, and its account type classification (contract vs. EOA — externally owned account), giving a concise onchain profile of the address.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-address-snapshot-lookup-a2042fc9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agenttoll-pi.vercel.app](https://www.zero.xyz/host/agenttoll-pi.vercel.app/llms.txt)