# Ethereum Address Activity Lookup

> Ethereum Address Activity Lookup is a paid API for AI agents from asistent-crypto.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the ETH balance and recent large transfers in and out for a given Ethereum address

## Facts

- Endpoint: POST https://asistent-crypto.vercel.app/api/x402/data/address
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ethereum-address-activity-lookup-c1aca469
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J2ac5okoHuj0o3vNKi99k

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 ethereum-address-activity-lookup-c1aca469 -d '<json body>'
```

Example prompt: Pull up the ETH balance and recent large transfers for this Ethereum address: 0xBE0eB53F46cd790Cd13851d5EFf43D12404d33E8 — I want to see what's been moving in and out.

## When to prefer this

Use this endpoint when you need a quick snapshot of a specific Ethereum address — its current ETH balance plus recent large-value transfers — without querying a full blockchain explorer. Ideal for investigating wallets named in news stories, monitoring exchange or treasury wallets, or doing rapid due diligence on a specific address. Prefer this over general market data endpoints when the user has a specific address in mind and wants movement context, not price data.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- Address with no recent large transfers returns empty transfer list but valid balance
- Network or RPC provider downtime may cause timeouts
- Payment failure (insufficient USDC or x402 protocol error) blocks the request
- Rate limiting if called too frequently

## How this service works

Ethereum address activity: ETH balance plus recent large transfers in and out. Point it at an exchange wallet, a treasury or a wallet a headline just named, and get the movement behind the story rather than the story.

## Output

Returns the ETH balance of the specified address along with a list of recent large transfers (both inflows and outflows), including transfer amounts, counterparty addresses, and direction, enabling on-chain movement analysis without needing a full blockchain explorer.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [],
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    }
   },
   "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/ethereum-address-activity-lookup-c1aca469/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from asistent-crypto.vercel.app](https://www.zero.xyz/host/asistent-crypto.vercel.app/llms.txt)