Czech koruna exchange rate fixing, daily

At a glance

Publisher

Czech National Bank · homepage

Category

Exchange rates

Jurisdiction

Czech Republic

Publisher updates

Each working day at around 2.30 p.m. CET

SourceFinch checks

Daily by default

Records per run

30 in the latest run

Record key

currency_code

Acquired from

Publisher's public API: https://api.cnb.cz/cnbapi/exrates/daily?lang=EN

Recipe

v1.0.0, approved October 12, 2026

Verified since

October 12, 2026

Last green run

October 12, 2026

What the data contains

The Czech National Bank declares exchange rates of the Czech koruna against commonly traded currencies every working day at around 2.30 p.m.; each rate is valid for that day and any following weekend or public holiday. The CNB publishes the fixing through its keyless CNB API. This source reads the current fixing on each daily run and makes one record per currency, keyed by the ISO currency code, with the country, currency name, the amount the rate refers to (1, 100 or 1,000 units), the rate in koruna for that amount, the date it is valid for and the CNB's running fixing number for the year. A monitor reports each new fixing per currency. The data describes exchange rates and contains no personal data. SourceFinch is independent of the CNB.

Fields and types

Every record has these fields. The key field currency_code identifies a record across runs, so changes are reported field by field.

Sample output

The first 5 of 30 records from SourceFinch's own run on October 12, 2026, exactly as delivered.

[
  {
    "rate": 15.212,
    "amount": 1,
    "country": "Australia",
    "currency": "dollar",
    "valid_for": "2026-10-12",
    "currency_code": "AUD",
    "fixing_number": 196
  },
  {
    "rate": 4.369,
    "amount": 1,
    "country": "Brazil",
    "currency": "real",
    "valid_for": "2026-10-12",
    "currency_code": "BRL",
    "fixing_number": 196
  },
  {
    "rate": 15.293,
    "amount": 1,
    "country": "Canada",
    "currency": "dollar",
    "valid_for": "2026-10-12",
    "currency_code": "CAD",
    "fixing_number": 196
  },
  {
    "rate": 3.259,
    "amount": 1,
    "country": "China",
    "currency": "renminbi",
    "valid_for": "2026-10-12",
    "currency_code": "CNY",
    "fixing_number": 196
  },
  {
    "rate": 3.263,
    "amount": 1,
    "country": "Denmark",
    "currency": "krone",
    "valid_for": "2026-10-12",
    "currency_code": "DKK",
    "fixing_number": 196
  }
]

Evidence behind every value

• Each run keeps the publisher's exact response, hashed with SHA-256. This sample came from a response with hash 619e5ed6175c2b98d1ec15ce0256ae6e025fe0a0313b1fee5d3d1ea12d32f084.
• Every value records where it came from in that response: a JSON Pointer into the retained capture.
• Each run gets a signed manifest (Ed25519) timestamped by an RFC 3161 authority: this run's manifest hash is 0bda95f5344a2ec7994e5d4ac248700428241439c68d1b6ae47a8d1c372805e7, timestamped October 12, 2026.
• The compliance state at capture is recorded with the evidence: robots.txt hash and verdict, AI-preference signals, crawler identity and the usage rights below.
• Download any run as an evidence bundle (WACZ) and check it offline, without trusting SourceFinch: sourcefinch verify-bundle run.wacz.

Terms posture and usage rights

The Czech National Bank's disclaimer and copyright notice lets users store, distribute and reproduce all of its internet information except texts with a named author and images whose copyright the CNB does not own, provided the CNB is always stated as the source (Source: the CNB) and the content is not altered or its meaning changed; the CNB logo may not be used without approval. api.cnb.cz serves no robots.txt (HTTP 404), which RFC 9309 treats as allowing access, and the API needs no key.

Source: the CNB (Czech National Bank exchange rate fixing), values unaltered and reformatted by SourceFinch. SourceFinch is independent of and not endorsed by the Czech National Bank.

Usage rights travel with every record SourceFinch delivers (API, exports, webhooks and evidence bundles). They are our documented understanding of the publisher's stated terms, not legal advice.

Reliability

Runs, last 30 days

1

Green

100%

Failed

0

Median run time

1.3 s

Latest run

success, October 12, 2026

Measured on completed runs of this recipe version across SourceFinch, anonymized, within a rolling 30-day window. First successful observation: October 12, 2026. A new recipe has only the history collected since that date; this is not a 30-day uptime guarantee.

Use it

Every surface creates the same monitor from this Verified recipe. Monitors keep record history, report field-level changes and deliver by webhook, export or email. You confirm you have the right to collect the source (rights: true).

{
  "schema": "sourcefinch/source@1",
  "name": "Czech koruna exchange rate fixing, daily",
  "url": "https://api.cnb.cz/cnbapi/exrates/daily?lang=EN",
  "recipe": {
    "mode": "http",
    "format": "json",
    "items": "rates[*]",
    "fields": {
      "rate": "rate",
      "amount": "amount",
      "country": "country",
      "currency": "currency",
      "valid_for": "validFor",
      "currency_code": "currencyCode",
      "fixing_number": "order"
    },
    "required": [
      "currency_code",
      "rate"
    ],
    "types": {
      "amount": "integer",
      "fixing_number": "integer",
      "rate": "number",
      "valid_for": "date"
    }
  },
  "schedule": "daily",
  "key_field": "currency_code"
}

{
  "name": "Czech koruna exchange rate fixing, daily",
  "url": "https://api.cnb.cz/cnbapi/exrates/daily?lang=EN",
  "recipe": {
    "mode": "http",
    "format": "json",
    "items": "rates[*]",
    "fields": {
      "rate": "rate",
      "amount": "amount",
      "country": "country",
      "currency": "currency",
      "valid_for": "validFor",
      "currency_code": "currencyCode",
      "fixing_number": "order"
    },
    "required": [
      "currency_code",
      "rate"
    ],
    "types": {
      "rate": "number",
      "amount": "integer",
      "valid_for": "date",
      "fixing_number": "integer"
    }
  },
  "key_field": "currency_code",
  "schedule": "daily",
  "rights": true,
  "catalog": {
    "slug": "czech-national-bank-koruna-exchange-rates",
    "version_id": "f27dd921-460c-4ea0-878e-0893ba42ccea"
  }
}

# the Verified entry (fields, recipe, sample, terms) as JSON
curl https://sourcefinch.com/v1/catalog/czech-national-bank-koruna-exchange-rates -H "Authorization: Bearer $SOURCEFINCH_API_KEY"

# create the monitor from source.json (below)
curl -X POST https://sourcefinch.com/v1/sources \
  -H "Authorization: Bearer $SOURCEFINCH_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d @source.json

# then run it now (later runs follow the schedule)
curl -X POST https://sourcefinch.com/v1/sources/$SOURCE_ID/runs \
  -H "Authorization: Bearer $SOURCEFINCH_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)"

sourcefinch login
sourcefinch catalog get czech-national-bank-koruna-exchange-rates --source-json > source.json
sourcefinch sources create --file source.json
sourcefinch runs create $SOURCE_ID --wait
sourcefinch records $SOURCE_ID

import { SourceFinch } from "@sourcefinch/sdk";

const sf = new SourceFinch({ apiKey: process.env.SOURCEFINCH_API_KEY });
const entry = await sf.catalog.get("czech-national-bank-koruna-exchange-rates");
const source = await sf.sources.create({
  catalog: { slug: entry.slug, version_id: entry.recipe.version_id },
  name: entry.name.slice(0, 100),
  url: entry.acquisition_path.endpoint,
  recipe: entry.recipe.definition,
  key_field: entry.recipe.key_field,
  schedule: entry.recipe.schedule,
  rights: true, // you confirm you have the right to collect this source
});
const run = await sf.runs.wait((await sf.runs.create(source.id)).id);
console.log(run.status);

claude mcp add --transport http sourcefinch https://sourcefinch.com/mcp

# then ask your agent:
"Use SourceFinch to monitor Czech koruna exchange rate fixing, daily: get_catalog_source czech-national-bank-koruna-exchange-rates,
then create_source with its create_source_args (dry run first), then run_source."

Pricing

Each check is one run, whatever the number of records, and failed runs are free. On its default daily schedule this source uses about 30 runs a month, which fits the Free plan's 300 runs. It uses HTTP acquisition, so no browser runs are needed. See plans.

Guides using this source

• Compare central bank exchange rates every business day

All guides

Related sources

• Danish krone exchange rates, last five business days · Exchange rates, Danmarks Nationalbank
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• Swedish krona exchange rates, latest by currency · Exchange rates, Sveriges Riksbank
• U.S. Treasury reporting rate of exchange for the euro, quarterly · Exchange rates, Bureau of the Fiscal Service (U.S. Department of the Treasury)

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