# Marketing Contribution Return - Local Finite-Change Elasticity Calculator

> Marketing Contribution Return - 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 2026-10-23).

Computes the local finite-change elasticity of marketing contribution return by measuring how a small percentage change in one input (attributed contribution or marketing spend) affects the output, returning the formula, units, and limitations as JSON.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-marketing-return-elasticity?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/marketing-contribution-return-local-finite-change-elasticity-calculator-3de7a899
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RHQ1-3e4_ZxPxNQ4uKHLN

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 marketing-contribution-return-local-finite-change-elasticity-calculator-3de7a899 -d '<json body>'
```

Example prompt: Calculate the local finite-change elasticity of marketing contribution return — my baseline is marketing_spend of 5000 and attributed_contribution of 8000, vary the attributed_contribution field with a step of 1%, and give me the formula and units.

## When to prefer this

Choose this endpoint when you need a quick, formula-backed local elasticity estimate for the marketing contribution return metric given supplied baseline figures, and want the result packaged with formula, units, and caveats — especially when you do not need global sensitivity analysis, batch processing, or live data feeds.

## Known failure modes

- marketing_spend must be nonzero (exclusiveMinimum: 0) — zero spend causes division error
- step_percent out of range (must be 0.01–10) returns validation error
- missing required baseline fields (marketing_spend or attributed_contribution) returns schema error
- attributed_contribution of zero for the varied field may produce undefined elasticity
- payment failure (insufficient USDC) blocks execution

## How this service works

Marketing contribution return - Local finite-change elasticity: Measure output response to a supplied small percentage change in one nonzero input; local approximation. Metric: Marketing contribution return. 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 value for marketing contribution return, along with the formula used, measurement units, and a statement of limitations (local approximation scope). One report per call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "field": {
   "enum": [
    "attributed_contribution",
    "marketing_spend"
   ],
   "type": "string",
   "default": "attributed_contribution"
  },
  "baseline": {
   "type": "object",
   "default": {
    "marketing_spend": 5000,
    "attributed_contribution": 8000
   },
   "required": [
    "attributed_contribution",
    "marketing_spend"
   ],
   "properties": {
    "marketing_spend": {
     "type": "number",
     "default": 5000,
     "maximum": 1000000000000,
     "minimum": 0,
     "description": "Amount in a consistent supplied currency and reporting period",
     "exclusiveMinimum": 0
    },
    "attributed_contribution": {
     "type": "number",
     "default": 8000,
     "maximum": 1000000000000,
     "minimum": -1000000000000,
     "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/marketing-contribution-return-local-finite-change-elasticity-calculator-3de7a899/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)