# YourAITools Counterparty Quick Check

> YourAITools Counterparty Quick Check is a paid API for AI agents from api.youraitools.co, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-23).

Performs a rapid risk/trust check on a blockchain address (EVM or Solana), returning a verdict, risk reasons, identity signals, and cross-chain context.

## Facts

- Endpoint: GET https://api.youraitools.co/counterpartycheck/v1/quick?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/youraitools-counterparty-quick-check-edf897ff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NdoUGtO8mjl-36F8xlCEC

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 youraitools-counterparty-quick-check-edf897ff
```

Example prompt: Before I send that USDC payment, can you do a quick counterparty check on 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum and tell me if it's safe to pay?

## When to prefer this

Choose this endpoint when an AI agent needs a fast, single-call risk signal on a specific blockchain address before executing a payment, approval, or interaction. It is particularly valuable in agentic payment workflows (x402, USDC on Base/Solana) where the agent must decide in real time whether a counterparty is trustworthy. Prefer it over full audit tools when speed matters and a quick verdict with key signals (ENS, EIP-7702, cross-chain presence) is sufficient.

## Known failure modes

- Invalid or malformed address format returns an error
- Unsupported chain identifier returns a validation error
- Address with no on-chain history may return low-confidence results
- Rate limiting or payment failure (402) if USDC payment not attached
- Network timeouts on slow RPC nodes may delay response

## How this service works

Crypto counterparty due diligence API. Counterparty due-diligence report: everything in lite plus contract verification and deployer screening (Sourcify), ENS and Basename (forward-verified), cross-chain presence (wrong-chain protection for smart wallets and Safes), Safe owner and contract owner screening and explorer labels. Verdict ok / caution / block with reasons and confidence.

## Output

Returns a JSON object containing: a 'verdict' field (ok/warn/alert), a 'confidence' level (high/medium/low), the detected 'kind' of address (eoa, contract, eip7702_delegated_eoa, etc.), ENS identity data if available, cross-chain presence on other networks, a list of 'reasons' with codes/severity/text explaining each signal found, and a human-readable 'summary' string.

## 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": {
      "chain": {
       "enum": [
        "base",
        "ethereum",
        "polygon",
        "arbitrum",
        "solana"
       ],
       "type": "string",
       "description": "Chain of the payment (default base; a base58 address implies solana)"
      },
      "intent": {
       "enum": [
        "pay",
        "approve",
        "interact"
       ],
       "type": "string",
       "description": "What you are about to do (default pay): changes which signals matter, e.g. paying a token contract or approving an EOA"
      },
      "address": {
       "type": "string",
       "description": "Counterparty address: EVM 0x + 40 hex, or a Solana base58 address"
      }
     },
     "description": "Search intents: wallet due diligence, contract verification check, ens lookup, address reputation, crypto kyt, counterparty report"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "tier": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "facts": {
       "type": "object"
      },
      "checks": {
       "type": "object"
      },
      "intent": {
       "type": "string"
      },
      "address": {
       "type": "string"
      },
      "reasons": {
       "type": "array"
      },
      "summary": {
       "type": "string"
      },
      "verdict": {
       "type": "string"
      },
      "confidence": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": "quick",
  "chain": "ethereum",
  "facts": {
   "kind": "eip7702_delegated_eoa",
   "nonce": 5969,
   "delegate": "0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d"
  },
  "checks": {
   "identity": {
    "ens": {
     "name": "vitalik.eth",
     "verified": true
    }
   },
   "cross_chain": {
    "base": {
     "kind": "eoa",
     "nonce": 0
    }
   }
  },
  "intent": "pay",
  "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "reasons": [
   {
    "code": "eip7702",
    "text": "EOA with an EIP-7702 delegation to 0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d: its code is the delegate contract.",
    "severity": "info"
   },
   {
    "code": "verified",
    "text": "Delegate contract source verified on Sourcify.",
    "severity": "good"
   },
   {
    "code": "ens",
    "text": "ENS name vitalik.eth (reverse record, forward-verified).",
    "severity": "good"
   }
  ],
  "summary": "OK: no risk signal found for this eip7702 delegated eoa on Ethereum (verified, ens).",
  "verdict": "ok",
  "confidence": "high"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/youraitools-counterparty-quick-check-edf897ff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.youraitools.co](https://www.zero.xyz/host/api.youraitools.co/llms.txt)