# NullClear Agent Reputation Audit

> NullClear Agent Reputation Audit is a paid API for AI agents from api.nullclear.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Fetches a trust score, sybil risk rating, escrow readiness, and reputation grade for a given ERC-8004 AI Agent on Base Mainnet

## Facts

- Endpoint: GET https://api.nullclear.dev/v1/bazaar/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nullclear-agent-reputation-audit-ae0d97b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Tc-TPusVeSAHyITu6T-Bu

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 nullclear-agent-reputation-audit-ae0d97b0
```

Example prompt: Can you pull the NullClear reputation audit for agent ID 124595 — I need to know its trust score, grade, and whether it's escrow-ready before I proceed with any payment?

## When to prefer this

Use this endpoint when you need to assess the on-chain reputation of an ERC-8004 AI agent on Base Mainnet before initiating a payment, escrow arrangement, or deferred clearing transaction via the x402 protocol. It is specifically designed for non-custodial agent-to-agent trust assessment and is the canonical source for NullClear sybil risk and escrow readiness signals.

## Known failure modes

- Unknown or unregistered agentId returns a 404 or empty result
- Agent not yet indexed on Base Mainnet returns stale or missing data
- Invalid agentId format returns a validation error
- Network or RPC issues on Base Mainnet may cause delays or timeouts
- Rate limiting at $0.01/call may reject unpaid or under-funded requests

## How this service works

Non-custodial deferred clearing, deep invariant validation, and reputation protocol for x402 AI Agents on Base Mainnet

## Output

Returns a JSON object containing the agent's reputation grade (e.g. A–F), numeric trust score (0–100), sybil risk level (low/medium/high), escrow readiness flag (boolean), and the audit timestamp — giving a full reputation snapshot for the queried agent.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "agentId": {
   "type": "string",
   "description": "ERC-8004 Agent Token ID on Base Mainnet"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "grade": "A",
  "agentId": "124595",
  "sybilRisk": "low",
  "timestamp": 1729045678901,
  "trustScore": 98,
  "escrowReady": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nullclear-agent-reputation-audit-ae0d97b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.nullclear.dev](https://www.zero.xyz/host/api.nullclear.dev/llms.txt)