# Exact Real Interest Rate – Base-100 Rebase Report

> Exact Real Interest Rate – 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 exact real interest rate calculations against a chosen base observation, returning indexed (base-100) values with formula, units, and limitations.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-finance-real-interest-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/exact-real-interest-rate-base-100-rebase-report-a2d1da17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W3HVTweZoH4wS9D7Rn05M

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 exact-real-interest-rate-base-100-rebase-report-a2d1da17 -d '<json body>'
```

Example prompt: Rebase this real-interest-rate series to a base-100 index starting at observation 0 — the rows are: nominal 5%, inflation 2%; nominal 5.5%, inflation 2.2%; nominal 4.8%, inflation 1.9% — and give me the formula and units in the report.

## When to prefer this

Choose this endpoint when you need a base-100 normalized index of exact real interest rate values across a time series — for example, to compare how real rates have moved relative to a chosen reference period. Prefer it over raw real-rate calculators when indexed comparability (rather than absolute values) is the goal, and when you do not need live market data or advisory output.

## Known failure modes

- Fewer than 2 rows supplied — minimum array length not met
- base_index out of range — must be between 0 and (number of rows − 1)
- nominal_rate_percent or inflation_percent outside allowed range (−99 to 1000)
- Malformed JSON body causing schema validation failure
- Payment not processed or insufficient USDC balance (x402 payment required)
- Server error from the datapackvibe.com endpoint

## How this service works

Exact real interest rate - Base-100 rebase report: Rebase ordered calculated values against a supplied positive base observation. Metric: Exact real interest rate. 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 series of exact real interest rates indexed to the chosen base observation, along with the calculation formula applied, units of measurement, and stated limitations of the methodology. No live market data, financial advice, or trade execution is included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "nominal_rate_percent",
     "inflation_percent"
    ],
    "properties": {
     "inflation_percent": {
      "type": "number",
      "default": 2,
      "maximum": 1000,
      "minimum": -99,
      "description": "Percent units: enter 5 for 5%, not 0.05"
     },
     "nominal_rate_percent": {
      "type": "number",
      "default": 5,
      "maximum": 1000,
      "minimum": -99,
      "description": "Percent units: enter 5 for 5%, not 0.05"
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "inflation_percent": 2,
     "nominal_rate_percent": 5
    },
    {
     "inflation_percent": 2.2,
     "nominal_rate_percent": 5.5
    },
    {
     "inflation_percent": 2,
     "nominal_rate_percent": 5
    },
    {
     "inflation_percent": 2.2,
     "nominal_rate_percent": 5.5
    }
   ],
   "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/exact-real-interest-rate-base-100-rebase-report-a2d1da17/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)