# AUROS Variance Physical

> AUROS Variance Physical is a paid API for AI agents from getauros.com, paid per call via x402, $0.18/call, status unknown (last checked 2026-10-29).

Returns a physical energy proof pack comparing promised vs. attested watt-hours, with health indicators, rolling rollups (last 2/4/8 periods), and Welch PSD spectral analysis on historical data — HMAC-signed when attest signing is configured.

## Facts

- Endpoint: POST https://getauros.com/api/v1/variance-physical?utm_source=zero.xyz
- Price: $0.18/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/auros-variance-physical-b5e933a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XFspKOBi9Hl7KXj1HRJbr

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 auros-variance-physical-b5e933a7 -d '<json body>'
```

Example prompt: Pull the AUROS Variance Physical proof pack for my lab token 0xabc123 — I need the promised vs attested Wh comparison, health status, the last 2/4/8 rollups, and the Welch PSD on its history so I can verify the physical energy claims before we proceed.

## When to prefer this

Choose this endpoint when you need cryptographically verifiable, lab-level evidence that a physical energy asset delivered what it promised — specifically the Wh variance, spectral health, and rolling period rollups. Prefer it over the AUROS Green Transparency or Activity Integrity endpoints when the core question is 'did the physical hardware actually produce the claimed watt-hours?' rather than green label accuracy or on-chain activity patterns. Note: this is lab-indicative HITL data, not SCADA-grade industrial telemetry, and variance ≠ gap ≠ activity ≠ green.

## Known failure modes

- Invalid or expired lab token returns an authentication or not-found error
- Missing token falls back to demo/freemium window with limited data
- HMAC signing unavailable if attest signing is not configured for the asset
- Insufficient history for PSD computation if asset is new or has sparse data
- Payment failure (x402) blocks access to paid tier results

## How this service works

Physical energy proof pack: promised vs attested Wh, health, last_2/4/8 rollups, Welch PSD on history. Freemium card is free. HMAC-signed when attest signing is configured. Lab-indicative HITL — not SCADA. Gap ≠ Activity ≠ Variance ≠ Green.

## Output

A structured proof pack containing: promised Wh vs. attested Wh with variance delta, asset health indicator, rolling rollup summaries for the last 2, 4, and 8 periods, Welch Power Spectral Density (PSD) output on the energy history, and optionally an HMAC signature when attest signing is configured. A freemium demo window is available without a lab token.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "token": {
   "type": "string",
   "description": "Optional 0x lab token; omit for AUROS demo window"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/auros-variance-physical-b5e933a7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from getauros.com](https://www.zero.xyz/host/getauros.com/llms.txt)