# Observed Unit Sales Velocity – Ordered Trend Analysis

> Observed Unit Sales Velocity – Ordered Trend Analysis 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).

Accepts a sequence of retail unit sales records (units sold and observation period in days) and returns an ordered trend analysis of unit sales velocity.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ar-retail-unit-sales-velocity-trend?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/observed-unit-sales-velocity-ordered-trend-analysis-36a7f506
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mkp3I3adGNhaZ81qIYR7n

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 observed-unit-sales-velocity-ordered-trend-analysis-36a7f506 -d '<json body>'
```

Example prompt: I have 6 retail reporting periods with units sold and the number of days each was observed — can you run an ordered trend analysis on those sales velocity figures to see if my sell-through rate is accelerating or decelerating?

## When to prefer this

Choose this endpoint when you have a time-ordered sequence of retail sales records (units sold + observation window in days) and need a computed trend analysis of sales velocity — particularly when you want to detect acceleration or deceleration in sell-through rates across up to 200 periods. It is purpose-built for supplied retail figures and is best when you do not need live market data, pricing feeds, or order execution.

## Known failure modes

- Fewer than 2 rows provided — minimum 2 records required
- More than 200 rows submitted — exceeds maxItems limit
- observed_days value of 0 or negative — exclusiveMinimum constraint violated
- sold_units outside allowed range (negative or exceeding 1e12) — schema validation error
- Malformed JSON body — returns 400 or payment-gated rejection
- Insufficient USDC balance — x402 payment failure before processing

## How this service works

Observed unit sales velocity - Ordered trend analysis: Ordered trend analysis for Observed unit sales velocity. Supplied retail figures only, up to 200 records. No platform access, live rates or order execution. One of 25 new profiles across 20 shared operations in this industry. 0.01 USDC includes one bounded ordered trend analysis report.

## Output

A bounded ordered trend analysis report covering the submitted retail records, showing unit sales velocity (units per day) across the input sequence ordered by trend direction or magnitude — up to 200 records analyzed. No live rates, platform access, or order execution is included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "sold_units",
     "observed_days"
    ],
    "properties": {
     "sold_units": {
      "type": "number",
      "default": 84,
      "maximum": 1000000000000,
      "minimum": 0
     },
     "observed_days": {
      "type": "number",
      "default": 7,
      "maximum": 1000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "sold_units": 84,
     "observed_days": 7
    },
    {
     "sold_units": 92.4,
     "observed_days": 7.700000000000001
    },
    {
     "sold_units": 84,
     "observed_days": 7
    },
    {
     "sold_units": 92.4,
     "observed_days": 7.700000000000001
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/observed-unit-sales-velocity-ordered-trend-analysis-36a7f506/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)