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x402stock.xyz US Treasury Exchange Rates
x402
x402stock.xyz US Treasury Exchange Rates is a paid API for AI agents from x402stock.xyz, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Returns official US Treasury FX reference rates for ~170 currencies (foreign currency units per 1 USD) for the latest quarter, sourced from FiscalData.
Price / call$0.02
Success—
StatusUnknown
How this service works
Official US Treasury reporting rates of exchange — government FX reference rates for ~170 currencies, in units of foreign currency per 1 USD, for the latest quarter. Use for accounting-grade and exotic-currency conversion the market /api/v1/forex feed lacks. Filter with `?currency=Euro`. Updated quarterly. From the US Treasury (FiscalData). From x402stock
Output
A JSON object with source ('us_treasury'), as_of date, record_date, series name, count of rates, and an array of rate objects each containing country, currency name, country_currency label, exchange_rate (foreign currency units per 1 USD), and effective_date.
Example use cases
Audit-compliant foreign currency conversion
“I need to convert some USD amounts to Japanese Yen for our quarterly financial audit — can you pull the official US Treasury FX rate for JPY so our accountants have a government-authoritative figure to work with?”
Exotic currency rate for compliance reporting
“We're filing a compliance report that involves transactions in Nigerian Naira and Kazakhstani Tenge — can you look up the official US Treasury exchange rates for both of those currencies from the FiscalData source?”
Cross-check market FX with Treasury rates
“I want to compare the current market rate for the South Korean Won against the official US Treasury reference rate — can you fetch the Treasury's latest quarterly FX rate for KRW so I can see how far off the market feed is?”
Technical details
Endpoint
GEThttps://x402stock.xyz/api/v1/exchange-ratesWhen to prefer
Choose this endpoint when you need official, government-authoritative FX rates for accounting, auditing, or compliance purposes — especially for exotic currencies not reliably covered by market feeds. Prefer over market FX endpoints when the source must be the US Treasury FiscalData and quarterly precision is acceptable.
Side effects
- Invalid or unrecognized currency name in filter returns empty rates array or no match
- Quarterly update lag means rates may be up to 3 months old — not suitable for real-time market pricing
- Currency not covered by Treasury (~170 currencies total) returns no result
- Network or payment errors return non-200 status
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"currency": "EUR"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"note": "Official US Treasury reporting rates of exchange — units of foreign currency per 1 USD. Updated quarterly; use for accounting/reference conversion, not live FX (see /api/v1/forex for market rates).",
"as_of": "2026-03-31T00:00:00.000Z",
"count": 1,
"rates": [
{
"country": "Euro Zone",
"currency": "Euro",
"exchange_rate": 0.87,
"effective_date": "2026-03-31",
"country_currency": "Euro Zone-Euro"
}
],
"series": "rates_of_exchange",
"source": "us_treasury",
"record_date": "2026-03-31"
}Schema · Response
{
"type": "json",
"example": {
"note": "Official US Treasury reporting rates of exchange — units of foreign currency per 1 USD. Updated quarterly; use for accounting/reference conversion, not live FX (see /api/v1/forex for market rates).",
"as_of": "2026-03-31T00:00:00.000Z",
"count": 168,
"rates": [
{
"country": "Euro Zone",
"currency": "Euro",
"exchange_rate": 0.924,
"effective_date": "2026-03-31",
"country_currency": "Euro Zone-Euro"
},
{
"country": "Japan",
"currency": "Yen",
"exchange_rate": 149.32,
"effective_date": "2026-03-31",
"country_currency": "Japan-Yen"
}
],
"series": "rates_of_exchange",
"source": "us_treasury",
"record_date": "2026-03-31"
}
}Tags
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