Currency Exchange · head-to-head
Exchangerate.dev vs National Bank of Poland
Exchangerate.dev is a lean, Frankfurter-compatible FX endpoint aimed at fintech apps, trading tools, and AI agents that want genuinely intraday pricing rather than a once-daily fix: its supported currencies refresh roughly every 60 seconds through the trading week, and every quote is tagged with its source and timestamp so callers can tell a live tick from a stale daily rate. It requires no API key or card to start, positioning itself as a near drop-in replacement for Frankfurter's response shape for teams that need faster-moving data.
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.
| Exchangerate.dev | National Bank of Poland | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | JSON | JSON, XML |
| CORS | unknown | yes |
| HTTPS | Yes | Yes |
National Bank of Poland supports CORS, while Exchangerate.dev doesn't — pick National Bank of Poland for direct browser calls.