# Agent Behavior Fingerprint

> Agent Behavior Fingerprint is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).

Creates a privacy-minimized behavioral commitment (fingerprint) from bounded agent observations for trust and accountability purposes

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/agent-behavior-fingerprint?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-behavior-fingerprint-59b2f52c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9Xtv1ReYDUXJYfm43KanG

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 agent-behavior-fingerprint-59b2f52c -d '<json body>'
```

Example prompt: Create a privacy-minimized behavioral fingerprint from my agent's bounded observation window — I want a compact commitment I can use to prove its behavioral pattern without exposing the raw logs.

## When to prefer this

Choose this endpoint when you need a privacy-preserving, compact representation of an AI agent's behavioral pattern from a finite observation window — especially when raw observation data must not be shared but a verifiable behavioral commitment is required for trust, audit, or compliance workflows. Prefer this over full behavioral logging when privacy minimization is a hard constraint.

## Known failure modes

- Empty or malformed observation set returns a validation error
- Observation set exceeds bounded limits and is rejected
- Insufficient behavioral data to produce a meaningful fingerprint
- Schema mismatch in input object causes processing failure
- Service unavailability returns a 402 or 5xx error

## How this service works

Create a privacy-minimized behavioral commitment from bounded observations

## Output

A privacy-minimized behavioral commitment or fingerprint derived from the bounded observation set — a compact, cryptographically-safe digest that represents the agent's behavioral pattern without exposing raw observation data, suitable for trust verification, auditing, or accountability purposes.

## 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/agent-behavior-fingerprint-59b2f52c/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)