verify
Independent ZARONIA coupon verification for SA FRNs & money-market paper, SARB-compounded index.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"verify": {
"url": "https://api.zaroniacalculator.co.za/mcp"
}
}
}Remote endpoints
https://api.zaroniacalculator.co.za/mcpstreamable-httpWhat it can do
Tool inventory
Tools (4)
🟢get_conventions
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.
Input Schema
{
"type": "object",
"properties": {},
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢get_latest_index
FREE. The latest published SARB Compounded ZARONIA Index point — date and 12dp value. Use it to confirm data freshness before verifying.
Input Schema
{
"type": "object",
"properties": {},
"$schema": "http://json-schema.org/draft-07/schema#"
}⚪verify_frn_coupon(calc_date, issue_date, first_coupon_date, coupon_frequency, margin_pct, ...)
PAID ($0.25). Independently recompute and verify a listed South African ZARONIA FRN coupon (SARB §2.2.3 compounded-index formula). Returns the coupon to 4dp, full audit workings (observation dates, index values, formula), and a match/mismatch verdict at 0.05bp tolerance when expected_coupon_pct is given. Pass api_key if you have one; otherwise the response explains how to pay via x402.
Input Schema
{
"type": "object",
"properties": {
"calc_date": {
"type": "string",
"description": "YYYY-MM-DD — issue, reset or mid-period date to recompute at"
},
"issue_date": {
"type": "string",
"description": "YYYY-MM-DD"
},
"first_coupon_date": {
"type": "string",
"description": "YYYY-MM-DD — first IPD; Modified Following schedule from here"
},
"coupon_frequency": {
"type": "string",
"enum": [
"Monthly",
"Quarterly",
"Semi-annually",
"Annually"
]
},
"margin_pct": {
"type": "number",
"description": "Prospectus margin/spread, percent p.a."
},
"lookback_bdays": {
"description": "Per-bond lookback, default 5",
"type": "integer",
"minimum": 0,
"maximum": 10
},
"expected_coupon_pct": {
"description": "The coupon you were given — enables the verdict",
"type": "number"
},
"api_key": {
"description": "zaronia-verify API key (bypasses x402; metered for invoicing)",
"type": "string"
}
},
"required": [
"calc_date",
"issue_date",
"first_coupon_date",
"coupon_frequency",
"margin_pct"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}⚪verify_otc_coupon(settlement_date, margin_pct, expected_coupon_pct, api_key)
PAID ($0.10). Independently recompute and verify an OTC money-market ZARONIA coupon (1-bday lookback, Act/365, half-up 4dp). Returns coupon, workings and a verdict at 0.05bp tolerance when expected_coupon_pct is given. Pass api_key if you have one; otherwise the response explains how to pay via x402.
Input Schema
{
"type": "object",
"properties": {
"settlement_date": {
"type": "string",
"description": "YYYY-MM-DD — settlement = issue date"
},
"margin_pct": {
"type": "number"
},
"expected_coupon_pct": {
"type": "number"
},
"api_key": {
"description": "zaronia-verify API key",
"type": "string"
}
},
"required": [
"settlement_date",
"margin_pct"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}Community
Evidence