# Margin of Safety – Adjacent Period Changes

> Margin of Safety – 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 2026-10-18).

Calculates period-over-period differences and eligible percent changes in margin of safety across supplied rows of actual vs. break-even sales data, returning no-interpolation results in JSON.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-margin-safety-period-changes?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/margin-of-safety-adjacent-period-changes-8e28c8a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x0FrY5Qea51_BRtTsYp3p

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 margin-of-safety-adjacent-period-changes-8e28c8a0 -d '<json body>'
```

Example prompt: I have four quarters of data — actual sales were 10000, 11000, 10000, 11000 and break-even sales were 7000, 7700, 7000, 7700 — can you run the adjacent period changes report on margin of safety to show me how much it shifted between each consecutive quarter?

## When to prefer this

Choose this endpoint when you have your own historical actual_sales and break_even_sales figures and need a period-by-period margin of safety difference report without any smoothing or interpolation. It is ideal for auditable, supply-only financial analysis where you want the raw adjacent changes and percent shifts alongside the formula and unit metadata. Prefer it over interpolation-based or trend-fit endpoints when data integrity and strict use of supplied values are required.

## Known failure modes

- Fewer than 2 rows provided — minimum 2 rows required for any adjacent comparison
- actual_sales value of 0 or missing — field is required and must be a positive non-zero number
- break_even_sales exceeds actual_sales by a large margin, which may yield negative or boundary-case margin of safety values
- More than 200 rows submitted — maximum array size is 200
- Non-numeric values in sales fields cause schema validation failure
- Payment failure or insufficient USDC balance prevents endpoint execution

## How this service works

Margin of safety - Adjacent period changes: Report adjacent-observation differences and eligible percent changes; no interpolation. Metric: Margin of safety. 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

A JSON object containing adjacent-observation differences and eligible percent changes for the margin of safety metric across all supplied row pairs, along with the formula used, units, and a limitations note. No data is interpolated — only supplied figures are used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "actual_sales",
     "break_even_sales"
    ],
    "properties": {
     "actual_sales": {
      "type": "number",
      "default": 10000,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period",
      "exclusiveMinimum": 0
     },
     "break_even_sales": {
      "type": "number",
      "default": 7000,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period"
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "actual_sales": 10000,
     "break_even_sales": 7000
    },
    {
     "actual_sales": 11000,
     "break_even_sales": 7700.000000000001
    },
    {
     "actual_sales": 10000,
     "break_even_sales": 7000
    },
    {
     "actual_sales": 11000,
     "break_even_sales": 7700.000000000001
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/margin-of-safety-adjacent-period-changes-8e28c8a0/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)