get_historic_best_worst
Historic Best/Worst FX Performance
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Analyze historic best/worst FX performance for a currency pair over a Guard's duration. Uses Bank of England historic rates. Returns a 'performances' array with 6 entries — BEST and WORST for each of three lookback periods (5, 10, 25 years). Each entry contains: type, lookbackYears, startDate/endDate, startRate/endRate, performancePercentage, startAmount, finalAmount, deltaAmount. For Guard-Pay: negative delta = cost decreased = BEST; positive delta = cost increased = WORST. For Guard-Receive: positive delta = receipt increased = BEST; negative delta = receipt decreased = WORST. Parameters must match the values used in the preceding price_guard call, including payReceive (PAY or RECEIVE).
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| guardCurrency | string | yes | Home/base currency ISO code — MUST match guardCurrency from price_guard |
| foreignCurrency | string | yes | Foreign currency ISO code — MUST match foreignCurrency from price_guard |
| payReceive | string | yes | MUST be the exact same payReceive value you used in price_guard (PAY or RECEIVE). Do NOT change it. |
| foreignAmount | number | yes | Amount in foreign currency — MUST match foreignAmount from price_guard |
| guardAmount | number | yes | Guard amount in base/home currency from the Guard quote (the guardAmount field from the price_guard response) |
| settlementDate | string | yes | Settlement date in ISO format YYYY-MM-DD — MUST match settlementDate from price_guard |
Raw JSON schema
{
"type": "object",
"properties": {
"guardCurrency": {
"type": "string",
"description": "Home/base currency ISO code — MUST match guardCurrency from price_guard"
},
"foreignCurrency": {
"type": "string",
"description": "Foreign currency ISO code — MUST match foreignCurrency from price_guard"
},
"payReceive": {
"type": "string",
"description": "MUST be the exact same payReceive value you used in price_guard (PAY or RECEIVE). Do NOT change it."
},
"foreignAmount": {
"type": "number",
"description": "Amount in foreign currency — MUST match foreignAmount from price_guard"
},
"guardAmount": {
"type": "number",
"description": "Guard amount in base/home currency from the Guard quote (the guardAmount field from the price_guard response)"
},
"settlementDate": {
"type": "string",
"description": "Settlement date in ISO format YYYY-MM-DD — MUST match settlementDate from price_guard"
}
},
"required": [
"guardCurrency",
"foreignCurrency",
"payReceive",
"foreignAmount",
"guardAmount",
"settlementDate"
]
}