---
title: "CNB CZK fixing history for a single currency"
method: GET
path: "/api/v1/cnb/fx/{ccy}/history"
tags: ["Central Banks & Monetary"]
---

# CNB CZK fixing history for a single currency

`GET /api/v1/cnb/fx/{ccy}/history`

Daily CNB CZK fixing history for one currency across a date window. CNB has published the daily fixing since 1991-01-01, so historical windows spanning more than three decades are supported. Sugra loops the upstream `/cnbapi/exrates/daily-year` endpoint across the years covered by the window and normalises each row to a per-unit mid rate.

## Path parameters

- `ccy` string, required — Currency ISO 4217 code (case-insensitive).

## Query parameters

- `from` string, required — Start of the fixing-date window (YYYY-MM-DD).
- `to` string, required — End of the fixing-date window (YYYY-MM-DD).

## Response `200`

Daily CNB CZK fixing observations for the requested currency across the window, sorted by ascending date.

- EnvelopeCnbFxHistoryPayload
  - `data` CnbFxHistoryPayload, required
    - `currency_code` string, required — ISO 4217 currency code requested.
    - `date_from` string, required — Start of the requested window (YYYY-MM-DD).
    - `date_to` string, required — End of the requested window (YYYY-MM-DD).
    - `count` integer, required — Number of daily observations returned.
    - `observations` CnbFxRate[], required — Daily CNB fixing rows for the currency, sorted by ascending date and normalised to per-unit mid rates.
      - `valid_for` string, nullable — Date the fixing applies to (YYYY-MM-DD).
      - `currency_code` string, nullable — ISO 4217 currency code (e.g. USD, EUR, JPY). Legacy pre-euro codes (DEM, ATS, XEU) appear in historical data.
      - `country` string, nullable — Country or area name in English (follows `lang=EN`).
      - `currency` string, nullable — Currency name in English (e.g. 'dollar', 'euro', 'yen').
      - `amount` integer, nullable — Upstream CNB multiplier (1, 100, or 1000 units). Used to compute the per-unit mid rate.
      - `rate` number, nullable — Raw CNB rate as published - expressed as CZK per `amount` units of the currency.
      - `mid_czk` number, nullable — Normalised mid rate in CZK per 1 unit of the currency (`rate / amount`).
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/revisions/4e2740743eb4/schema)