# Marketing Contribution Return – Base-100 Rebase Report

> Marketing Contribution Return – Base-100 Rebase Report 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).

Rebases a series of marketing contribution return values against a chosen base observation, returning index-normalised figures with formula, units, and limitations.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-marketing-return-index?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/marketing-contribution-return-base-100-rebase-report-c5f150be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cZ44n6E3r5KFeycR-MSa0

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-base-100-rebase-report-c5f150be -d '<json body>'
```

Example prompt: I have 4 periods of marketing data — spends of $5000, $5500, $5000, $5500 and attributed contributions of $8000, $8800, $8000, $8800 — can you rebase the marketing contribution return as a base-100 index starting from the first observation and give me the formula and units?

## When to prefer this

Choose this endpoint when you need to express a series of marketing contribution return observations as an indexed series relative to a specific reference period, particularly for trend comparison, stakeholder reporting, or normalisation across different spend scales. It is purpose-built for this metric and returns the formula and units alongside figures, making it suitable for auditable or explainable analytics workflows. Prefer alternatives if you need raw ROAS, trend-line fitting, or benchmark correlation rather than index normalisation.

## Known failure modes

- Fewer than 2 rows supplied — minimum items constraint violated
- base_index references a row that does not exist in the submitted array
- marketing_spend value is zero or negative — exclusiveMinimum constraint violated
- Row objects missing required fields attributed_contribution or marketing_spend
- More than 200 rows submitted — maxItems constraint violated
- Base observation produces a zero denominator (zero contribution return at base point), preventing valid rebase

## How this service works

Marketing contribution return - Base-100 rebase report: Rebase ordered calculated values against a supplied positive base observation. 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 base-100 rebase report report.

## Output

A JSON object containing the base-100 rebased marketing contribution return values for each supplied row, the mathematical formula applied, the units of the output index, and stated limitations of the calculation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "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
   },
   "default": [
    {
     "marketing_spend": 5000,
     "attributed_contribution": 8000
    },
    {
     "marketing_spend": 5500,
     "attributed_contribution": 8800
    },
    {
     "marketing_spend": 5000,
     "attributed_contribution": 8000
    },
    {
     "marketing_spend": 5500,
     "attributed_contribution": 8800
    }
   ],
   "maxItems": 200,
   "minItems": 2
  },
  "base_index": {
   "type": "integer",
   "default": 0,
   "maximum": 199,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/marketing-contribution-return-base-100-rebase-report-c5f150be/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)