# Break-even Sales Units — Sequential Input-Change Attribution (Waterfall)

> Break-even Sales Units — Sequential Input-Change Attribution (Waterfall) is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Performs a sequential (waterfall) attribution analysis on break-even sales units by changing each input from baseline to final values in declared field order, reporting each incremental effect.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-break-even-units-waterfall?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/break-even-sales-units-sequential-input-change-attribution-waterfall-44085f0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GYi2A_3plTlVeFxTdgIi7

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 break-even-sales-units-sequential-input-change-attribution-waterfall-44085f0f -d '<json body>'
```

Example prompt: Run a sequential waterfall attribution on my break-even sales units: baseline is unit price $20, fixed costs $5,000, variable cost per unit $12 — and the new scenario is unit price $22, fixed costs $5,500, variable cost $13.20. Show me how much each input change contributed to the shift in break-even quantity, in the order they appear in the schema.

## When to prefer this

Choose this endpoint when you need to understand not just how break-even sales units changed between two scenarios, but how much each individual input (price, fixed costs, variable cost) contributed to that change in sequence. It is order-dependent, making it ideal for waterfall/bridge chart analysis and CFO-style variance reports. Use alternatives if you need simultaneous (Shapley-style) attribution, a sensitivity table across a range of values, or a simple before/after comparison without step decomposition.

## Known failure modes

- Missing required fields in before or after objects returns a validation error
- unit_price must be greater than 0 (exclusiveMinimum); zero or negative value rejected
- variable_cost_per_unit >= unit_price causes infinite or undefined break-even (contribution margin ≤ 0)
- Values exceeding 1,000,000,000,000 are rejected by schema maximum
- Non-numeric input types return schema validation errors
- Insufficient USDC balance or x402 payment failure blocks request

## How this service works

Break-even sales units - Sequential input-change attribution: Change each input from baseline to final in declared field order, reporting each incremental effect; order dependent. Metric: Break-even sales units. 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 sequential input-change attribution report.

## Output

A JSON response containing the break-even waterfall attribution: for each input field (in declared schema order), the incremental effect on break-even sales units as it moves from baseline to final value, plus the overall formula used, units, and stated limitations of the analysis.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "object",
   "default": {
    "unit_price": 22,
    "fixed_costs": 5500,
    "variable_cost_per_unit": 13.200000000000001
   },
   "required": [
    "fixed_costs",
    "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",
     "exclusiveMinimum": 0
    },
    "fixed_costs": {
     "type": "number",
     "default": 5000,
     "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
  },
  "before": {
   "type": "object",
   "default": {
    "unit_price": 20,
    "fixed_costs": 5000,
    "variable_cost_per_unit": 12
   },
   "required": [
    "fixed_costs",
    "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",
     "exclusiveMinimum": 0
    },
    "fixed_costs": {
     "type": "number",
     "default": 5000,
     "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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/break-even-sales-units-sequential-input-change-attribution-waterfall-44085f0f/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)