Official Treasury currency exchange rate API

Return the latest official US Treasury Reporting Rate of Exchange for a country's currency (units per USD) from the keyless US Treasury FiscalData API, normalized into a clean schema (country, currency, units-per-USD, record/effective date). Answers 'what is the official Treasury exchange rate for X?','how many units of currency Y per US dollar for government reporting?'.

Price$0.01per request

MethodPOST

Route/v1/gov/treasury-exchange-rates

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache3600s public

govtreasuryexchange-ratecurrencyforexfiscalfxus

API URLhttps://x402.hexl.dev/v1/gov/treasury-exchange-rates

Integration docs

Example request

{
  "country": "Euro Zone"
}

Example response

{
  "query": "Euro Zone",
  "recordDate": "2026-03-31",
  "country": "Euro Zone",
  "currency": "Euro",
  "countryCurrency": "Euro Zone-Euro",
  "unitsPerUsd": 0.924,
  "effectiveDate": "2026-03-31",
  "found": true
}

Input schema

{
  "type": "object",
  "required": [
    "country"
  ],
  "properties": {
    "country": {
      "type": "string",
      "examples": [
        "Canada",
        "Euro Zone",
        "Japan"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}