# Unit Contribution Local Finite-Change Elasticity Calculator

> Unit Contribution Local Finite-Change Elasticity Calculator is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Measures how unit contribution (unit price minus variable cost per unit) responds to a small percentage change in a specified input variable, providing a local elasticity approximation.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-unit-contribution-elasticity?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unit-contribution-local-finite-change-elasticity-calculator-50e8099d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HmMJYQxjyRXsIFCXwiNTh

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 unit-contribution-local-finite-change-elasticity-calculator-50e8099d -d '<json body>'
```

Example prompt: Can you calculate the local finite-change elasticity of unit contribution for a product priced at $20 with a variable cost of $12 per unit, varying the unit price by 1%?

## When to prefer this

Use this endpoint when you need a quick, interpretable local sensitivity measure showing how unit contribution responds to marginal changes in price or variable cost, especially for back-of-envelope pricing decisions or scenario planning. Prefer it over full financial modeling APIs when you only need a single-variable elasticity approximation and want a structured JSON result with formula and caveats included.

## Known failure modes

- Variable cost per unit equals unit price (zero unit contribution baseline causes division issues)
- Step percent outside allowed range 0.01–10 returns validation error
- Missing required baseline fields returns schema validation error
- Extremely large values near the maximum bound may produce numerically unstable results

## How this service works

Unit contribution - Local finite-change elasticity: Measure output response to a supplied small percentage change in one nonzero input; local approximation. Metric: Unit contribution. 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 local finite-change elasticity report.

## Output

A JSON object containing the computed local finite-change elasticity of unit contribution, along with the formula used, units, and a statement of limitations (local approximation only, valid for small percentage changes around the supplied baseline).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "field": {
   "enum": [
    "unit_price",
    "variable_cost_per_unit"
   ],
   "type": "string",
   "default": "unit_price"
  },
  "baseline": {
   "type": "object",
   "default": {
    "unit_price": 20,
    "variable_cost_per_unit": 12
   },
   "required": [
    "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"
    },
    "variable_cost_per_unit": {
     "type": "number",
     "default": 12,
     "maximum": 1000000000000,
     "minimum": 0,
     "description": "Amount in a consistent supplied currency and reporting period"
    }
   },
   "additionalProperties": false
  },
  "step_percent": {
   "type": "number",
   "default": 1,
   "maximum": 10,
   "minimum": 0.01
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unit-contribution-local-finite-change-elasticity-calculator-50e8099d/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)