# Trust Anomaly Detector

> Trust Anomaly Detector is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-23).

Detects material drift between comparable trust vectors without asserting misconduct or making definitive fraud claims

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/trust-anomaly-detector?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/trust-anomaly-detector-c4a0ee95
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_reZ3pl_qWDbC6LQjfLx_k

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 trust-anomaly-detector-c4a0ee95 -d '<json body>'
```

Example prompt: Can you check whether the trust vector for agent 'procurement-bot-v2' has drifted materially from the baseline we established last week — I want to know if there are any significant anomalies without anyone making a formal misconduct accusation?

## When to prefer this

Choose this endpoint when you need an objective, neutral measurement of drift between two trust profiles — especially in agentic commerce or multi-agent coordination contexts where you want risk signals without triggering formal misconduct assertions. Prefer it over a full fraud-detection service when neutrality and non-accusatory framing are important, or when comparing agent trust vectors rather than evaluating raw transaction data.

## Known failure modes

- Malformed or missing trust vector inputs return a validation error
- Incomparable vector schemas (mismatched dimensions) may produce unreliable drift scores
- Insufficient baseline data results in a low-confidence or inconclusive anomaly report
- Network or service unavailability returns a 503 or payment-related 402 error
- Ambiguous identity references for the compared agents may cause lookup failures

## How this service works

Detect material drift between comparable trust vectors without asserting misconduct

## Output

Returns a structured report identifying the magnitude and nature of drift between two trust vectors, including an anomaly score, a summary of deviations across key trust dimensions, and risk indicators — without asserting misconduct or making definitive fraud determinations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "example"
   ],
   "properties": {
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/trust-anomaly-detector-c4a0ee95/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phion.systems](https://www.zero.xyz/host/phion.systems/llms.txt)