# Context Provenance Labeler

> Context Provenance Labeler is a paid API for AI agents from phion.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Hashes and labels agent context with integrity, confidentiality, and source declarations to establish trust provenance

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/context-provenance-labeler
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/context-provenance-labeler-6d80bf99
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W2FQ0riyzBO-ktQd94VhH

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 context-provenance-labeler-6d80bf99 -d '<json body>'
```

Example prompt: Hash and label this agent context with declared integrity level 'high', confidentiality level 'internal', and source 'user-input' so it can be safely passed to the next step in the pipeline.

## When to prefer this

Choose this endpoint when your agent pipeline requires explicit provenance tracking on context — particularly before handing context between agents, storing it, or using it to make high-stakes decisions. It is the right choice when you need a tamper-evident, machine-readable label encoding integrity, confidentiality, and source rather than a simple checksum or manual annotation.

## Known failure modes

- Missing or malformed context payload returns a 400 error
- Unsupported integrity or confidentiality enum values result in validation rejection
- Empty context body may return a schema validation error
- Service unavailability or timeout returns a 5xx error
- Hash collision edge cases may require retry with explicit nonce

## How this service works

Hash and label agent context by declared integrity, confidentiality and source

## Output

Returns a hash of the submitted context along with structured provenance labels encoding the declared integrity level, confidentiality classification, and source identifier — enabling downstream agents or systems to verify and reason about the trustworthiness of the context.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/context-provenance-labeler-6d80bf99/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)