# Ethereum Wallet Behavior Classifier

> Ethereum Wallet Behavior Classifier is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Classifies an Ethereum wallet address into behavioral categories (exchange, MEV bot, whale, smart-money, fresh, contract, sybil, unknown) with confidence score and onchain signals

## Facts

- Endpoint: GET https://api.x402node.dev/wallet/classify
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-x402node-dev-e7e33560
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lFQnQ_BcUDfVsQLZJupJu

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 api-x402node-dev-e7e33560
```

Example prompt: Can you classify the Ethereum wallet 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD and tell me whether it's an exchange, MEV bot, whale, or sybil — along with the confidence score and any onchain signals?

## When to prefer this

Use this endpoint when you need behavioral profiling of an Ethereum mainnet wallet for counterparty assessment, treasury monitoring, or sybil detection — especially when you want a combined signal from onchain RPC data and Coinbase Bazaar x402 payment history. Prefer this over raw balance lookups when you need a human-readable classification label and confidence score rather than raw transaction data.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- Address with insufficient onchain history may return tag 'unknown' with low confidence
- RPC node downtime may cause timeout or 500 error
- Non-Ethereum addresses (e.g. Bitcoin, Base) will not be classified correctly
- Rate limiting or payment failure may block the request

## How this service works

Classify Ethereum wallet by behavior pattern: exchange, MEV bot, whale, smart-money, fresh, contract, sybil, unknown. Returns primary_tag, confidence (0-1), signals (tx frequency, counterparty patterns, x402 payment history), metrics (nonce, eth_balance, is_contract). Combines onchain RPC analysis with Coinbase Bazaar payer behavior. Use for AI trading agent counterparty assessment, treasury monitoring, on-chain due diligence.

## Output

Returns a JSON object with primary_tag (one of: exchange, MEV bot, whale, smart-money, fresh, contract, sybil, unknown), a confidence value between 0 and 1, behavioral signals (tx frequency, counterparty patterns, x402 payment history), and raw metrics (nonce, ETH balance, is_contract flag).

## Example request

```json
{
 "address": "0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD"
}
```

## 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",
       "description": "EVM/chain address (required)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-x402node-dev-e7e33560/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)