# GDP Implicit Price Deflator – Adjacent Period Changes

> GDP Implicit Price Deflator – 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 2026-10-18).

Computes adjacent-observation differences and eligible percent changes for the GDP implicit price deflator from supplied nominal and real GDP row pairs.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-gdp-deflator-period-changes?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/gdp-implicit-price-deflator-adjacent-period-changes-5e1ca71a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-4Sm9WzyuNKCUugIY_Vo-

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 gdp-implicit-price-deflator-adjacent-period-changes-5e1ca71a -d '<json body>'
```

Example prompt: I have two consecutive quarters of GDP data — nominal GDP of 1200 and 1320 billion, and real GDP of 1000 and 1100 billion — can you compute the adjacent period changes in the GDP implicit price deflator for me?

## When to prefer this

Choose this endpoint when you need adjacent-period (consecutive observation) differences and percent changes for the GDP implicit price deflator using only supplied data, with no interpolation, and you want structured JSON output including the formula and units. Prefer this over generic inflation calculators when your analysis requires strict adherence to supplied data points and you are specifically working with the GDP deflator metric rather than CPI or PPI.

## Known failure modes

- Fewer than 2 row objects supplied — minimum input requirement not met
- Nominal or real GDP value is zero or negative — violates exclusiveMinimum constraint
- Array exceeds 200 items — maxItems limit exceeded
- Nominal or real GDP exceeds 1,000,000,000,000 — maximum value breached
- Malformed JSON body — returns parsing error
- Missing required fields nominal_gdp or real_gdp in one or more rows

## How this service works

GDP implicit price deflator - Adjacent period changes: Report adjacent-observation differences and eligible percent changes; no interpolation. Metric: GDP implicit price deflator. 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

Returns a JSON object containing the GDP implicit price deflator values for each supplied row pair, the adjacent-observation differences between consecutive periods, eligible percent changes, the formula used, units, and a statement of limitations. No interpolation is performed; only supplied data points are used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "nominal_gdp",
     "real_gdp"
    ],
    "properties": {
     "real_gdp": {
      "type": "number",
      "default": 1000,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period",
      "exclusiveMinimum": 0
     },
     "nominal_gdp": {
      "type": "number",
      "default": 1200,
      "maximum": 1000000000000,
      "minimum": 0,
      "description": "Amount in a consistent supplied currency and reporting period",
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "real_gdp": 1000,
     "nominal_gdp": 1200
    },
    {
     "real_gdp": 1100,
     "nominal_gdp": 1320
    },
    {
     "real_gdp": 1000,
     "nominal_gdp": 1200
    },
    {
     "real_gdp": 1100,
     "nominal_gdp": 1320
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gdp-implicit-price-deflator-adjacent-period-changes-5e1ca71a/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)