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CongressInvests vs Exchange Rates API

Same instrument, two spec sheets — measured, not claimed.

APICongressInvestsNEW—Exchange Rates APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CongressInvests vs Exchange Rates API: common questions

Which is more reliable, CongressInvests or Exchange Rates API?

On our scheduled checks, Exchange Rates API leads on measured uptime — CongressInvests at —% versus Exchange Rates API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do CongressInvests and Exchange Rates API need an API key?

Exchange Rates API needs no key, while CongressInvests requires a free API key. If you want to start calling without signup, reach for Exchange Rates API first.

Can I call CongressInvests and Exchange Rates API from the browser?

Only CongressInvests is browser-friendly — it returns CORS headers over HTTPS. Exchange Rates API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are CongressInvests and Exchange Rates API free for commercial use?

CongressInvests has unclear commercial terms, and Exchange Rates API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.