# Quack AI Agent Trust Check

> Quack AI Agent Trust Check is a paid API for AI agents from q402.quackai.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns ERC-8004 identity registration, reputation score, risk flags, and on-chain activity for a given EVM wallet address

## Facts

- Endpoint: GET https://q402.quackai.ai/api/x402/agent-trust/:address
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quack-ai-agent-trust-check-bb5d11da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZNjjfaUdkG0KRTZFBGzJC

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 quack-ai-agent-trust-check-bb5d11da
```

Example prompt: Can you run a trust check on the EVM address 0xe3eaff1266e3c3bf660b2fce7dc7bbf2eb58dc83 and tell me if it's ERC-8004 registered, what its reputation looks like, and whether there are any risk flags?

## When to prefer this

Use this endpoint when an AI agent or autonomous system needs to assess the trustworthiness of an EVM wallet address before interacting with it — especially for agent-to-agent interactions where ERC-8004 identity and on-chain reputation matter. Prefer this over generic blockchain explorers when you need structured trust signals (risk flags, reputation scores, identity registration) in a single API call rather than raw transaction data.

## Known failure modes

- Invalid or malformed EVM address returns an error
- Address not found on-chain may return empty on-chain activity and null reputation
- Payment failure (insufficient USDC balance) prevents the check from running
- Network congestion or RPC issues may cause delayed or failed on-chain data retrieval
- ERC-8004 registry unavailable results in isRegistered returning false with empty registrations

## How this service works

Agent Trust Check for 0xe3eaff1266e3c3bf660b2fce7dc7bbf2eb58dc83 — ERC-8004 identity, reputation, on-chain activity

## Output

Returns a JSON object containing: the queried EVM address, ERC-8004 registration status (isRegistered, registrations array, source), reputation data (summary value, feedback count, decimals, or null if unavailable), on-chain activity metrics (transaction count bucket, recent activity detected, window in blocks, source), a list of risk flags with flag name/severity/evidence, the USDC price paid, a receipt ID (atx_ prefix), and a timestamp of when the check was paid for.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "title": "AgentTrustCheck",
 "$schema": "http://json-schema.org/draft-07/schema#",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "address": {
     "type": "string",
     "pattern": "^0x[0-9a-fA-F]{40}$",
     "description": "EVM address as URL path segment (e.g. /api/x402/agent-trust/0xABC…)."
    },
    "description": {
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "description": "No query parameters; the EVM address is the URL path segment.",
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "paidAt": {
       "type": "string",
       "format": "date-time"
      },
      "address": {
       "type": "string"
      },
      "erc8004": {
       "type": "object",
       "required": [
        "isRegistered",
        "registrations",
        "source"
       ],
       "properties": {
        "source": {
         "type": "string"
        },
        "isRegistered": {
         "type": "boolean"
        },
        "registrations": {
         "type": "array"
        }
       }
      },
      "receipt": {
       "type": "string",
       "pattern": "^atx_"
      },
      "priceUsdc": {
       "type": "number"
      },
      "riskFlags": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "flag",
         "severity",
         "evidence"
        ],
        "properties": {
         "flag": {
          "type": "string"
         },
         "evidence": {
          "type": "string"
         },
         "severity": {
          "enum": [
           "low",
           "medium",
           "high"
          ],
          "type": "string"
         }
        }
       }
      },
      "reputation": {
       "oneOf": [
        {
         "type": "object",
         "properties": {
          "source": {
           "type": "string"
          },
          "summaryValue": {
           "type": "string"
          },
          "feedbackCount": {
           "type": "number"
          },
          "valueDecimals": {
           "ty
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quack-ai-agent-trust-check-bb5d11da/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from q402.quackai.ai](https://www.zero.xyz/host/q402.quackai.ai/llms.txt)