# Token Observed Price Change — IQR Outlier Flags

> Token Observed Price Change — IQR Outlier Flags is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Flags statistical outliers in a batch of token price-change observations using interquartile range (IQR) analysis.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-price-change-outliers?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-observed-price-change-iqr-outlier-flags-d143c1c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gfarinN7ov7tWKhYjBVBC

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 token-observed-price-change-iqr-outlier-flags-d143c1c8 -d '<json body>'
```

Example prompt: Check these token price observations for IQR outliers — I have pairs of current and previous prices: (1.2, 1.0), (1.32, 1.1), (5.80, 1.0), (1.2, 1.0) — flag which ones are statistical outliers based on interquartile range.

## When to prefer this

Choose this endpoint when you need a fast, deterministic, low-cost IQR-based outlier verdict on a batch of token price-change pairs (up to 200 rows) and do not need a live market scan, predictive model, or trade signal. Ideal for data cleaning, anomaly auditing, and pre-processing pipelines where a statistical threshold flag is sufficient.

## Known failure modes

- Fewer than 2 rows submitted — minimum 2 observations required for IQR calculation
- More than 200 rows submitted — batch size exceeds the maxItems limit
- Zero or negative price values — current_price and previous_price must be strictly positive (exclusiveMinimum: 0)
- Payment failure — 0.01 USDC x402 payment not processed correctly
- Malformed input — missing required fields current_price or previous_price in any row

## How this service works

Token observed price change — IQR outlier flags: IQR outlier flags for Token observed price change. Supplied token observations only. Deterministic calculation or caller-threshold verdict, not a live scan, safety proof or trade recommendation. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded iqr outlier flags report.

## Output

A bounded IQR outlier flags report for each submitted price-change observation, indicating which rows fall outside the interquartile range. The result is deterministic given the input data and does not reflect live market conditions or constitute a trade recommendation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "current_price",
     "previous_price"
    ],
    "properties": {
     "current_price": {
      "type": "number",
      "default": 1.2,
      "maximum": 10000000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     },
     "previous_price": {
      "type": "number",
      "default": 1,
      "maximum": 10000000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "current_price": 1.2,
     "previous_price": 1
    },
    {
     "current_price": 1.32,
     "previous_price": 1.1
    },
    {
     "current_price": 1.2,
     "previous_price": 1
    },
    {
     "current_price": 1.32,
     "previous_price": 1.1
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-observed-price-change-iqr-outlier-flags-d143c1c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)