# Gross Margin Return on Inventory (GMROI) - Local Finite-Change Elasticity Calculator

> Gross Margin Return on Inventory (GMROI) - 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 2026-10-18).

Computes the local finite-change elasticity of Gross Margin Return on Inventory (GMROI) with respect to gross profit or average inventory cost, given user-supplied baseline figures and a step percentage.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-retail-inventory-margin-return-elasticity?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/gross-margin-return-on-inventory-gmroi-local-finite-change-elasticity-b728b4f5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8Jkmi2mSxD4JghJcZyEkv

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 gross-margin-return-on-inventory-gmroi-local-finite-change-elasticity-b728b4f5 -d '<json body>'
```

Example prompt: Calculate the finite-change elasticity of GMROI with respect to gross_profit using a baseline gross profit of $5,000 and average inventory cost of $2,500, with a step size of 1%.

## When to prefer this

Choose this endpoint when you need a quick, locally-computed sensitivity or elasticity figure for GMROI based on your own retail figures — specifically when you don't need live inventory data, platform integration, or order execution, and just want to quantify how responsive GMROI is to a marginal change in gross profit or average inventory cost. Ideal for scenario planning, pricing decisions, and educational financial modeling in retail contexts.

## Known failure modes

- average_inventory_cost of zero or negative will be rejected (exclusiveMinimum: 0)
- step_percent outside range 0.01–10 will fail validation
- missing required baseline fields (gross_profit or average_inventory_cost) cause schema errors
- field value not in enum ['gross_profit','average_inventory_cost'] causes rejection
- values exceeding ±1,000,000,000,000 for gross_profit or +1,000,000,000,000 for average_inventory_cost will fail
- payment failure (insufficient USDC) results in 402 response

## How this service works

Gross margin return on inventory - Local finite-change elasticity: Local finite-change elasticity for Gross margin return on inventory. Supplied retail figures only. Local calculation and scenario analysis; no live inventory, account access, platform fee lookup or order execution. One of 25 profiles or calculations across 20 shared operations in this sector. 0.01 USDC includes one bounded local finite-change elasticity deliverable.

## Output

Returns a local finite-change elasticity value for GMROI relative to the specified input field (gross_profit or average_inventory_cost), computed from the supplied baseline figures and step percentage. This scalar quantifies how much GMROI changes proportionally in response to a small finite change in the chosen variable, enabling scenario analysis without live data access.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "field": {
   "enum": [
    "gross_profit",
    "average_inventory_cost"
   ],
   "type": "string",
   "default": "gross_profit"
  },
  "baseline": {
   "type": "object",
   "default": {
    "gross_profit": 5000,
    "average_inventory_cost": 2500
   },
   "required": [
    "gross_profit",
    "average_inventory_cost"
   ],
   "properties": {
    "gross_profit": {
     "type": "number",
     "default": 5000,
     "maximum": 1000000000000,
     "minimum": -1000000000000
    },
    "average_inventory_cost": {
     "type": "number",
     "default": 2500,
     "maximum": 1000000000000,
     "minimum": 0,
     "exclusiveMinimum": 0
    }
   },
   "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/gross-margin-return-on-inventory-gmroi-local-finite-change-elasticity-b728b4f5/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)