# Observed Unit Sales Velocity - Single Calculation

> Observed Unit Sales Velocity - Single Calculation is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).

Calculates the observed unit sales velocity (units sold per day) from a supplied count of units sold and the number of days observed.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ar-retail-unit-sales-velocity-calculate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/observed-unit-sales-velocity-single-calculation-b1afd2ae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gcSjJDzcPAkcmwu5NjZFY

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-single-calculation-b1afd2ae -d '<json body>'
```

Example prompt: Calculate my observed unit sales velocity — we sold 84 units over 7 days.

## When to prefer this

Use this endpoint when you need a quick, cheap ($0.01 USDC) single-shot calculation of unit sales velocity from raw retail figures (total units sold + observation period in days), without needing live inventory data, platform integrations, or order execution. Ideal for lightweight analytics pipelines, ad-hoc reporting, or agent workflows that need a deterministic velocity figure from supplied data.

## Known failure modes

- observed_days must be greater than 0 (exclusiveMinimum enforced) — passing 0 will result in a validation error
- sold_units or observed_days exceeding maximum of 1,000,000,000,000 will be rejected
- Missing required fields (sold_units or observed_days) will cause a 400-level error
- Non-numeric values for either field will fail schema validation

## How this service works

Observed unit sales velocity - Single calculation: Single 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 single calculation report.

## Output

A single bounded calculation report containing the observed unit sales velocity (units sold per unit time), derived from the supplied sold_units and observed_days values. The report is a one-time calculation with no live rates or platform access.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "values": {
   "type": "object",
   "default": {
    "sold_units": 84,
    "observed_days": 7
   },
   "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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/observed-unit-sales-velocity-single-calculation-b1afd2ae/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)