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CongressInvests vs Exchange Rates API

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

APICongressInvestsHEALTHY92Exchange Rates APIHEALTHY88
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms615810
P95 · ms13384162
AuthapiKeynone
CORSyesyes
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?

Both are neck-and-neck — CongressInvests and Exchange Rates API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, CongressInvests or Exchange Rates API?

CongressInvests has the lower median latency in our checks — CongressInvests responds in 615 ms versus Exchange Rates API at 810 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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?

Yes — both CongressInvests and Exchange Rates API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

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.