Historical Foreign Exchange Rates (Currency Pair, Date Range)

{
  "type": "object",
  "required": [
    "from",
    "to"
  ],
  "properties": {
    "to": {
      "type": "string",
      "description": "Target currency (e.g. USD)"
    },
    "from": {
      "type": "string",
      "description": "Source currency (e.g. EUR)"
    },
    "end_date": {
      "type": "string"
    },
    "start_date": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "properties": {
    "max": {
      "type": "number"
    },
    "min": {
      "type": "number"
    },
    "rates": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "date": {
            "type": "string",
            "description": "'YYYY-MM-DD'."
          },
          "rate": {
            "type": "number"
          }
        },
        "additionalProperties": true
      },
      "description": "One entry per trading day with a published rate. Observed 6 entries for a 7-calendar-day request (weekend/holiday gaps skipped) and 22 entries for the endpoint's own default ~1-month range -- day count is not guaranteed to match the calendar span requested."
    },
    "average": {
      "type": "number",
      "description": "Mean rate across all returned days."
    },
    "end_date": {
      "type": "string",
      "description": "End of the date range covered, 'YYYY-MM-DD'. Defaults to the current date when the caller omits it."
    },
    "start_date": {
      "type": "string",
      "description": "Start of the date range covered, 'YYYY-MM-DD'. When the caller omits start_date/end_date, this is the endpoint's own default range start, observed as one calendar month before the default end_date on the gbp-jpy-default fixture."
    },
    "data_points": {
      "type": "number",
      "description": "Count of entries in `rates`."
    },
    "to_currency": {
      "type": "string",
      "description": "Echoed target currency code, e.g. 'USD'."
    },
    "from_currency": {
      "type": "string",
      "description": "Echoed source currency code, e.g. 'EUR'."
    },
    "change_percent": {
      "type": "number",
      "description": "Percent change from the first to the last rate in the range; can be negative."
    }
  },
  "description": "The forex history result, as returned at routing.responseResultPath ($.output).",
  "additionalProperties": true
}