# za.co.zaroniacalculator.api/verify (remote · api.zaroniacalculator.co.za)

Independent ZARONIA coupon verification for SA FRNs & money-market paper, SARB-compounded index.

- Trust score: 65/100 (medium)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `api.zaroniacalculator.co.za`: 65/100 (this document), [markdown](https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api.md), [page](https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api)

## Channel facts

- Endpoint: `https://api.zaroniacalculator.co.za/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (fair).
  - Context-footprint check failed: tool/resource definitions use about 506 tokens (~126/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 75% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http za-co-zaroniacalculator-api-verify https://api.zaroniacalculator.co.za/mcp
```

### Codex

```toml
[mcp_servers.za-co-zaroniacalculator-api-verify]
url = "https://api.zaroniacalculator.co.za/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "za-co-zaroniacalculator-api-verify": {
      "type": "remote",
      "url": "https://api.zaroniacalculator.co.za/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add za-co-zaroniacalculator-api-verify --url https://api.zaroniacalculator.co.za/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  za-co-zaroniacalculator-api-verify:
    url: "https://api.zaroniacalculator.co.za/mcp"
```

### Other

```json
{
  "mcpServers": {
    "za-co-zaroniacalculator-api-verify": {
      "type": "http",
      "url": "https://api.zaroniacalculator.co.za/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 64, +2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 62, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-28 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 60, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 60)

First indexed and scored.

## MCP tools (4)

### `get_conventions` (~76 tokens)

FREE. The exact calculation conventions of both engines (listed FRN: SARB §2.2.3 compounded index, 5-bday lookback, Modified Following; OTC: 1-bday lookback, Act/365, half-up 4dp), the verification tolerance, and the index source. Call this first.

### `get_latest_index` (~41 tokens)

FREE. The latest published SARB Compounded ZARONIA Index point — date and 12dp value. Use it to confirm data freshness before verifying.

### `verify_frn_coupon` (~252 tokens)

PAID ($0.25). Independently recompute and verify a listed South African ZARONIA FRN coupon (SARB §2.2.3 compounded-index formula). Returns the coupon to 4dp, full audit workings (observation dates, index values, formula), and a match/mismatch verdict at 0.05bp tolerance when expected_coupon_pct is given. Pass api_key if you have one; otherwise the response explains how to pay via x402.

Input parameters:

- `api_key` (string): zaronia-verify API key (bypasses x402; metered for invoicing)
- `calc_date` (string, required): YYYY-MM-DD — issue, reset or mid-period date to recompute at
- `coupon_frequency` (string, required)
- `expected_coupon_pct` (number): The coupon you were given — enables the verdict
- `first_coupon_date` (string, required): YYYY-MM-DD — first IPD; Modified Following schedule from here
- `issue_date` (string, required): YYYY-MM-DD
- `lookback_bdays` (integer): Per-bond lookback, default 5
- `margin_pct` (number, required): Prospectus margin/spread, percent p.a.

### `verify_otc_coupon` (~137 tokens)

PAID ($0.10). Independently recompute and verify an OTC money-market ZARONIA coupon (1-bday lookback, Act/365, half-up 4dp). Returns coupon, workings and a verdict at 0.05bp tolerance when expected_coupon_pct is given. Pass api_key if you have one; otherwise the response explains how to pay via x402.

Input parameters:

- `api_key` (string): zaronia-verify API key
- `expected_coupon_pct` (number)
- `margin_pct` (number, required)
- `settlement_date` (string, required): YYYY-MM-DD — settlement = issue date

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api#diagnostics

## Score history

- 2026-08-03: 65
- 2026-08-02: 65
- 2026-08-01: 64
- 2026-07-31: 64
- 2026-07-30: 62
- 2026-07-29: 62
- 2026-07-28: 61
- 2026-07-27: 60
- 2026-07-26: 60

## Links

- Remote endpoint: https://api.zaroniacalculator.co.za/mcp
- Website: https://zaroniacalculator.co.za/
- Changelog RSS feed: https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api/changelog.json
- HTML version of this page: https://verifymcp.io/servers/za-co-zaroniacalculator-api-verify/api