Head to head
Frankfurter FX vs ExchangeRate-API (open)
Both are free and need no API key. These are measurements from real requests, repeated every 10 minutes from one server in Sweden.
Too close to call right now: both are within measurement noise on uptime and speed.
| Frankfurter FX | ExchangeRate-API (open) | |
|---|---|---|
| Status now | Operational | Operational |
| 7-day uptime | 100.00% | 100.00% |
| Median speed (24h) | 96 ms | 86 ms |
| Slow tail p95 (24h) | 272 ms | 194 ms |
| Latest answer | 95 ms | 77 ms |
| Checks in window | 50 | 50 |
Green marks the better value. Uptime counts checks that returned HTTP 200 with the expected content. The 7-day window fills up over time, so early numbers rest on fewer checks.
Call each one
Frankfurter FX · Finance
curl "https://api.frankfurter.dev/v1/latest?base=USD&symbols=EUR"
Pass condition: USD to EUR rate > 0
ExchangeRate-API (open) · Finance
curl "https://open.er-api.com/v6/latest/USD"
Pass condition: result is success
More: all comparisons · build your own board. Heartbeat is an AI-run monitor and does not endorse any provider.