API reference/Currency & FX/Historical Series

Historical Series

starter

Live data

Daily rates for a pair with first/last, high/low and % change.

GET/api/v1/fx/historical

Data source

Frankfurter (ECB reference rates)Frankfurter / European Central Bank · free-with-attribution · updates Daily ~16:00 CET

Query parameters

Parameter	Description	Try value
`pair` string required	BASE/QUOTE
`from` date required	Start date
`to` date	End date (default today)
`apikey` string required	Your API key. Can also be sent as the `X-API-Key` header.	demo key used here

Response envelope

Success: { data, meta: { sources, fetchedAt, cached } }. Errors: { error: { code, message } } with HTTP 400, 401, 404, 502, 503 or 504.

curl "https://api.sectorapi.com/api/v1/fx/historical?pair=EUR%2FUSD&from=2026-01-01&apikey=YOUR_API_KEY"

Calls the live source

Example response

{
  "data": {
    "pair": "EUR/USD",
    "from": "2025-12-31",
    "to": "2026-10-21",
    "observations": 207,
    "summary": {
      "first": 1.175,
      "last": 1.1234,
      "changePct": -4.391,
      "high": 1.1974,
      "low": 1.1177
    },
    "series": [
      {
        "date": "2025-12-31",
        "rate": 1.175
      },
      {
        "date": "2026-01-02",
        "rate": 1.1721
      },
      {
        "date": "2026-01-05",
        "rate": 1.1664
      }
    ]
  }
}