# Quack AI Q402 Agent Trust Deep Profile

> Quack AI Q402 Agent Trust Deep Profile is a paid API for AI agents from q402.quackai.ai, paid per call via x402, $0.49/call, status unknown (last checked 2026-09-10).

Returns a deep on-chain trust profile for an EVM wallet address, including ERC-8004 identity registration status, recent transaction activity, risk flags, and reputation signals.

## Facts

- Endpoint: GET https://q402.quackai.ai/api/x402/agent-trust/%7Baddress%7D/deep
- Price: $0.49/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quack-ai-q402-agent-trust-deep-profile-76658e66
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z_Yb2jPSlFxOJ1DJLHh4U

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-q402-agent-trust-deep-profile-76658e66
```

Example prompt: Can you pull a deep trust profile for the wallet 0x70997970C51812dc3A010C7d01b50e0d17dc79C8 — I want to see its ERC-8004 identity registration status, any risk flags, and how active it's been on-chain recently?

## When to prefer this

Use this endpoint when you need a comprehensive, multi-dimensional trust assessment of an EVM wallet that goes beyond a simple balance check — specifically when ERC-8004 identity registry status on Base and BSC, granular risk flags with evidence, and recent on-chain activity are all required in a single call. Prefer this over basic ENS lookups or single-chain scanners when operating in multi-chain agent environments where counterparty trust is critical before executing payments or granting access.

## Known failure modes

- Invalid or malformed EVM address returns an error
- Wallet has no on-chain activity resulting in txCountBucket of '0' and recentActivityDetected false
- ERC-8004 registry unreachable on BSC or Base RPC causing partial data
- Network timeout on public RPC nodes returning stale or incomplete activity window
- Address not found in any identity registry resulting in isRegistered false and empty registrations array

## How this service works

Q402 is a gasless payment protocol for EVM chains. Your users pay zero gas. You sponsor it, invisibly and instantly.

## Output

Returns a JSON object containing: the wallet address, timestamp of assessment, ERC-8004 identity registration details (source chain, registration status, registrations array), on-chain transaction count bucket and recent activity window (~30 min / 900 blocks on Base mainnet), an array of risk flags each with flag name, evidence, and severity level, a reputation field (null if unavailable), change indicators for new risk flags, identity events, and activity deltas, plus a payment receipt and price in USDC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "paidAt": "2026-08-19T05:00:00.000Z",
  "address": "0x70997970C51812dc3A010C7d01b50e0d17dc79C8",
  "erc8004": {
   "source": "ERC-8004 IdentityRegistry — BSC (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432) and Base queried",
   "isRegistered": false,
   "registrations": []
  },
  "receipt": "atx_b4c5d6e7f8a9b0c1d2e3f4a3",
  "priceUsdc": 0.49,
  "riskFlags": [
   {
    "flag": "no_8004_identity",
    "evidence": "ERC-8004 IdentityRegistry queried on BSC (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432) and Base — balanceOf returned 0",
    "severity": "low"
   }
  ],
  "reputation": null,
  "onChainActivity": {
   "source": "Base mainnet eth_getTransactionCount (public RPC; scan window 900 blocks ≈ 30 min)",
   "txCountBucket": "10-49",
   "recentActivityDetected": true,
   "recentActivityWindowBlocks": 900
  },
  "changeIndicators": {
   "new_risk_flags": [],
   "identity_events": [],
   "reputation_delta": null,
   "activity_delta_7d": null
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quack-ai-q402-agent-trust-deep-profile-76658e66/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)