# Deflator-adjusted GDP - Adjacent Period Changes

> Deflator-adjusted GDP - Adjacent Period Changes 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).

Computes period-over-period differences and percent changes in deflator-adjusted (real) GDP from a supplied sequence of nominal GDP and deflator values.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-real-gdp-period-changes?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/deflator-adjusted-gdp-adjacent-period-changes-675a6fc4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m0jimXM7z7XX1rtbqLMqX

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 deflator-adjusted-gdp-adjacent-period-changes-675a6fc4 -d '<json body>'
```

Example prompt: I have four quarters of nominal GDP and deflator data — Q1: nominal 1200, deflator 120; Q2: nominal 1320, deflator 132; Q3: nominal 1200, deflator 120; Q4: nominal 1320, deflator 132 — can you calculate the adjacent-period differences and percent changes in real GDP across those quarters?

## When to prefer this

Choose this endpoint when you have a time-ordered sequence of nominal GDP and deflator values and need to understand how real GDP changed between each consecutive observation — including both absolute differences and percent changes — without any interpolation or smoothing. It is ideal for quarterly or annual economic analysis where you want a transparent, formula-backed report rather than a modeled or forecasted output. Prefer it over single-calculation endpoints when you have multiple periods and want all adjacent comparisons in one call.

## Known failure modes

- Fewer than 2 rows supplied — minimum array length is 2
- Deflator value of zero or negative — exclusiveMinimum enforced, returns validation error
- Nominal GDP or deflator exceeds maximum (1,000,000,000,000) — returns out-of-range error
- More than 200 rows supplied — exceeds maxItems limit
- Missing required fields nominal_gdp or deflator_base_100 in any row — returns schema validation error
- Percent change reported as ineligible when base period real GDP is zero

## How this service works

Deflator-adjusted GDP - Adjacent period changes: Report adjacent-observation differences and eligible percent changes; no interpolation. Metric: Deflator-adjusted GDP. 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 adjacent period changes report.

## Output

A JSON response containing: the real GDP values derived from each supplied nominal GDP and deflator pair, the absolute differences between each adjacent pair of observations, the eligible percent changes between consecutive periods, the formula used, the units applied, and any stated limitations (e.g. no interpolation, supplied figures only).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "nominal_gdp",
     "deflator_base_100"
    ],
    "properties": {
     "nominal_gdp": {
      "type": "number",
      "default": 1200,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period"
     },
     "deflator_base_100": {
      "type": "number",
      "default": 120,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period",
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "nominal_gdp": 1200,
     "deflator_base_100": 120
    },
    {
     "nominal_gdp": 1320,
     "deflator_base_100": 132
    },
    {
     "nominal_gdp": 1200,
     "deflator_base_100": 120
    },
    {
     "nominal_gdp": 1320,
     "deflator_base_100": 132
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/deflator-adjusted-gdp-adjacent-period-changes-675a6fc4/health.json
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