# ZARONIA Compounded Index – Single Date Lookup

> ZARONIA Compounded Index – Single Date Lookup is a paid API for AI agents from api.zaroniacalculator.co.za, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-21).

Returns the SARB-published compounded ZARONIA index value for a specified date, used in South African floating-rate note calculations.

## Facts

- Endpoint: GET https://api.zaroniacalculator.co.za/v1/index/:date?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zaronia-compounded-index-single-date-lookup-a2e87495
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9srj9i5ZNVoDlndtYLMkN

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 zaronia-compounded-index-single-date-lookup-a2e87495
```

Example prompt: Can you pull the SARB compounded ZARONIA index value for 2024-06-14 so I can use it in my FRN coupon calculation?

## When to prefer this

Choose this endpoint when you need a single authoritative SARB-published compounded ZARONIA index value for a specific date, particularly for coupon calculations, settlement verification, or historical FRN analysis in South African rand-denominated instruments. Prefer it over general interest rate APIs when you specifically need the compounded overnight index (not a simple rate quote) in the South African market context.

## Known failure modes

- Date not found — if the requested date is a weekend, public holiday, or pre-ZARONIA publication date, the endpoint may return a 404 or empty result
- Invalid date format — malformed date path parameter returns a 400 error
- Future date — requesting a date beyond the latest published index returns no data
- Rate limit or payment failure — x402 micropayment not processed correctly results in a 402 error

## How this service works

One SARB Compounded ZARONIA Index point

## Output

A single JSON object containing the compounded ZARONIA index value published by the South African Reserve Bank for the requested date, representing the cumulative overnight rate compounding factor used in FRN coupon calculations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "date"
 ],
 "properties": {
  "date": {
   "type": "string",
   "format": "date"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zaronia-compounded-index-single-date-lookup-a2e87495/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.zaroniacalculator.co.za](https://www.zero.xyz/host/api.zaroniacalculator.co.za/llms.txt)