# PayTo Counterparty Check – Base/EVM Address Risk Screen

> PayTo Counterparty Check – Base/EVM Address Risk Screen is a paid API for AI agents from klane402.deanhiki.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Returns contract-vs-wallet classification, nonce, ETH balance, USDC balance, and a risk note for a given Base/EVM address before sending funds.

## Facts

- Endpoint: GET https://klane402.deanhiki.workers.dev/api/payto-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/payto-counterparty-check-base-evm-address-risk-screen-678714b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vq4TznNrOmsnJkV8_VS0S

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 payto-counterparty-check-base-evm-address-risk-screen-678714b4
```

Example prompt: Before you send those funds, can you check the address 0xAbC123...def on Base — is it a contract or a real wallet, how many transactions has it sent, and what are its ETH and USDC balances? Flag any risk.

## When to prefer this

Use this endpoint when an AI agent or workflow needs a quick, cheap ($0.01) pre-flight check on an EVM/Base address before executing a payment or interaction — specifically when you need contract-vs-wallet classification, nonce, and token balances in a single call without setting up your own RPC infrastructure.

## Known failure modes

- Invalid or malformed Ethereum address returns an error response
- Address not found on Base (zero activity) returns zeroed balances and a note indicating no history
- RPC node unavailability may cause timeouts or 5xx responses
- Missing 'address' query parameter results in a 400-style error
- Payment not made results in 402 response before data is returned

## How this service works

Pre-payment counterparty check for a Base (EVM) address: is it a contract or wallet, nonce (tx count), ETH and USDC balance, plus a simple risk note. Query: address. $0.01. Use before an agent sends funds.

## Output

A JSON object containing: the account type ('eoa' for externally owned account or 'contract'), txCount (nonce / number of transactions sent), ETH balance, USDC balance on Base, and a free-text risk note summarizing any concerns.

## 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",
     "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": {
  "note": "...",
  "type": "eoa",
  "usdc": 5.2,
  "txCount": 12
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payto-counterparty-check-base-evm-address-risk-screen-678714b4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klane402.deanhiki.workers.dev](https://www.zero.xyz/host/klane402.deanhiki.workers.dev/llms.txt)