Currency Exchange · head-to-head
Czech National Bank vs National Bank of Poland
The Czech National Bank publishes its official daily fixing of the koruna against roughly 30 foreign currencies, sourced from interbank market quotes and released every working day around 14:30 CET (weekends and holidays carry over the last valid fixing). Beyond the legacy raw XML feed this entry links to, CNB also runs a modern JSON REST API with interactive Swagger documentation and date-parameterized historical queries — and, like the old feed, it requires no key or registration.
The National Bank of Poland's Web API exposes the official mid-market currency reference rates it publishes daily across three rate tables, plus historical gold-price fixings dating back to January 2013 — all queryable by date, currency code, or table series via plain HTTP GET. Responses come back in JSON or XML depending on a format parameter, though historical range queries are capped at 93 days per request. The bank retired plain HTTP in August 2025 in favor of HTTPS-only access.
| Czech National Bank | National Bank of Poland | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | XML, JSON | JSON, XML |
| CORS | unknown | yes |
| HTTPS | Yes | Yes |
National Bank of Poland supports CORS, while Czech National Bank doesn't — pick National Bank of Poland for direct browser calls.