# Break-even Sales Units — Adjacent Period Changes

> Break-even Sales Units — Adjacent Period Changes 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).

Computes period-over-period differences and percent changes in break-even unit calculations across a supplied sequence of cost/price observations.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-break-even-units-period-changes?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/break-even-sales-units-adjacent-period-changes-e20e8fe4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m0cwys88gW8vypo7fXFbI

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 break-even-sales-units-adjacent-period-changes-e20e8fe4 -d '<json body>'
```

Example prompt: I have four consecutive quarters of cost data — Q1: fixed costs $5,000, price $20, variable cost $12; Q2: fixed costs $5,500, price $22, variable cost $13.20; Q3: fixed costs $5,000, price $20, variable cost $12; Q4: fixed costs $5,500, price $22, variable cost $13.20 — can you calculate the break-even unit count for each period and show me the adjacent period differences and percent changes?

## When to prefer this

Choose this endpoint when you have a sequence of 2–200 discrete cost/price observations and need to understand how break-even unit requirements shifted between adjacent periods, including both absolute differences and percent changes, with full formula transparency and no smoothing or interpolation. Prefer it over generic financial calculators when you specifically need the break-even framing (fixed costs, unit price, variable cost per unit) across time.

## Known failure modes

- Fewer than 2 rows supplied — minimum 2 observations required for period comparison
- Unit price at or below variable cost per unit yields undefined or infinite break-even (contribution margin ≤ 0)
- Values exceeding the 1,000,000,000,000 maximum trigger validation errors
- Non-numeric inputs for required fields cause schema validation failures
- Percent change reported as not eligible when base-period break-even is zero

## How this service works

Break-even sales units - Adjacent period changes: Report adjacent-observation differences and eligible percent changes; no interpolation. Metric: Break-even sales units. Supplied figures only; returns JSON with formula, units and limitations. One of 50 calculators with 20 analysis modes. No live feed, financial advice or trade execution. 0.01 USDC includes one bounded adjacent period changes report.

## Output

Returns a JSON object containing the break-even unit count for each supplied row, the raw adjacent-period differences between consecutive observations, eligible percent changes (where mathematically valid), the formula used, units, and a limitations notice clarifying that only supplied figures are used with no interpolation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "fixed_costs",
     "unit_price",
     "variable_cost_per_unit"
    ],
    "properties": {
     "unit_price": {
      "type": "number",
      "default": 20,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period",
      "exclusiveMinimum": 0
     },
     "fixed_costs": {
      "type": "number",
      "default": 5000,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period"
     },
     "variable_cost_per_unit": {
      "type": "number",
      "default": 12,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period"
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "unit_price": 20,
     "fixed_costs": 5000,
     "variable_cost_per_unit": 12
    },
    {
     "unit_price": 22,
     "fixed_costs": 5500,
     "variable_cost_per_unit": 13.200000000000001
    },
    {
     "unit_price": 20,
     "fixed_costs": 5000,
     "variable_cost_per_unit": 12
    },
    {
     "unit_price": 22,
     "fixed_costs": 5500,
     "variable_cost_per_unit": 13.200000000000001
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/break-even-sales-units-adjacent-period-changes-e20e8fe4/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)