# Observed Unit Sales Velocity – Batch Calculation

> Observed Unit Sales Velocity – Batch Calculation is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Calculates observed unit sales velocity (units sold per day) for up to 200 retail records in a single batch request using supplied sold units and observed days figures.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ar-retail-unit-sales-velocity-batch?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/observed-unit-sales-velocity-batch-calculation-57ddcffe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dgFkRnLq-5g1i9ISIMXSy

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-batch-calculation-57ddcffe -d '<json body>'
```

Example prompt: Calculate the observed unit sales velocity for my retail data — I have 5 products: 84 units sold over 7 days, 120 units over 14 days, 60 units over 3 days, 200 units over 30 days, and 45 units over 5 days. Give me the full batch velocity report.

## When to prefer this

Choose this endpoint when you need to compute unit sales velocity (units/day) for multiple retail records in a single call — up to 200 rows at once — using only your own historical sold_units and observed_days data. It is ideal for batch analytics workflows where you don't need live market rates, platform integrations, or order execution, and want a cost-effective ($0.01 USDC) bulk computation report.

## Known failure modes

- Empty rows array (minItems:1 violated) — request rejected with validation error
- More than 200 rows submitted (maxItems:200 violated) — batch rejected
- observed_days set to 0 or negative (exclusiveMinimum:0) — division by zero or validation error
- Non-numeric values in sold_units or observed_days — schema validation failure
- Payment failure or insufficient USDC balance — 402 Payment Required response

## How this service works

Observed unit sales velocity - Batch calculation: Batch calculation 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 batch calculation report.

## Output

A bounded batch calculation report containing the observed unit sales velocity (units sold per unit of time, i.e. per day) for each input row of sold_units and observed_days, covering up to 200 records per request. Results are derived purely from the supplied retail figures with no live market data or order execution.

## 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
    }
   ],
   "maxItems": 200,
   "minItems": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/observed-unit-sales-velocity-batch-calculation-57ddcffe/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)