M
API Matrix

Czech National Bank API

Currency Exchange / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
67 Score
Grade C
Visit Official Site Compare Alternatives

Overview

The Czech National Bank (CNB) publishes official daily exchange rates for 30+ currencies against the Czech Koruna (CZK) as a plain XML file. No authentication, account, or API key is required. This data is authoritative for Czech financial regulations, accounting, and VAT compliance.

💡

Beginner Tip

The endpoint returns XML not JSON. Parse the response with an XML library. The CNB URL provides today's rates at https://www.cnb.cz/en/financial_markets/foreign_exchange_market/exchange_rate_fixing/daily.xml. For a specific date append ?date=YYYY-MM-DD.

Available Data

exchange rate between currencies
conversion result
supported currency list
historical rates
country name and code
population

Example Response

JSON Response 
{
  "base": "USD",
  "date": "2025-01-15",
  "rates": {
    "EUR": 0.92,
    "GBP": 0.79,
    "JPY": 149.5,
    "CAD": 1.35
  }
}

Field Reference

Table.@date The date of the exchange rate publication in Czech date format.
Table.Row.Currency Full name of the foreign currency (e.g. US dollar).
Table.Row.Code Three-letter ISO currency code (e.g. USD, EUR).
Table.Row.Rate Exchange rate of the foreign currency in Czech Koruna, using a comma as the decimal separator.

Implementation Example 

const url = "https://www.cnb.cz/cs/financni_trhy/devizovy_trh/kurzy_devizoveho_trhu/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Cannot parse as JSON The CNB API returns XML, not JSON
✓ Use an XML parser such as xml2js in Node.js or ElementTree in Python. The XML structure uses Radek elements for each currency.
404 for English endpoint Using the Czech-language URL path which differs from the English one
✓ Use the English URL: https://www.cnb.cz/en/financial_markets/foreign_exchange_market/exchange_rate_fixing/daily.xml
No data for weekends or holidays The CNB only publishes rates on Czech banking days (weekdays excluding Czech public holidays)
✓ If you query a weekend or Czech holiday, fall back to the previous banking day by decrementing the date.

Matrix Score Breakdown

🌐 Reachability 15/30
⚡ Speed 10/20
🔒 Security 15/15
🛠 Developer XP 20/20
✓ Reliability 7/15
Response Time 837ms

Fully tested on Apr 5, 2026

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Currency Exchange
Difficulty Beginner
Verified: 2026-04-04

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