# PHION Index Feed

> PHION Index Feed is a paid API for AI agents from phion.systems, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).

Returns a canonical snapshot or digest-based delta of the PHION tool catalog, including exact execution templates and signed evidence for each listed capability

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/index-feed?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/phion-index-feed-8f1c8169
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zmYWlVk5cOqla9uULehRn

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 phion-index-feed-8f1c8169 -d '<json body>'
```

Example prompt: Pull the latest PHION catalog snapshot for me — I need the signed index with execution templates so I can see exactly which tools are currently listed and verify their evidence.

## When to prefer this

Choose this endpoint when an agent needs a trusted, verifiable, signed list of PHION-cataloged tools — especially when execution templates are needed for direct invocation, or when a digest-based delta is required to efficiently synchronize a local tool registry without re-fetching the entire catalog. Prefer over generic tool directories when cryptographic evidence and signed provenance of listed capabilities matter.

## Known failure modes

- Invalid or unrecognized digest hash returns an error or falls back to full snapshot
- Payment not received (x402) results in 402 Payment Required with payment instructions
- Malformed request body returns 400 with validation details
- Catalog temporarily unavailable returns 503
- Stale or expired signed evidence if catalog has not been refreshed recently

## How this service works

Canonical PHION catalog snapshot or digest-based delta with exact execution templates and signed evidence

## Output

A catalog snapshot or digest-based delta containing the current set of PHION-listed capabilities, each with exact execution templates (ready-to-use invocation parameters) and signed cryptographic evidence attesting to their listing. May include a digest identifier for future delta requests.

## 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/phion-index-feed-8f1c8169/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)