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Fed Treasury vs Tax Data

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

APIFed TreasuryNEW—Tax DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseOpen U.S. Government data (public domain)Unverified
Free tierFree — no API keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fed Treasury vs Tax Data: common questions

Which is more reliable, Fed Treasury or Tax Data?

On our scheduled checks, Tax Data leads on measured uptime — Fed Treasury at —% versus Tax Data 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 Fed Treasury and Tax Data need an API key?

Fed Treasury needs no key, while Tax Data requires a free API key. If you want to start calling without signup, reach for Fed Treasury first.

Can I call Fed Treasury and Tax Data from the browser?

Only Tax Data is browser-friendly — it returns CORS headers over HTTPS. Fed Treasury needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Fed Treasury and Tax Data free for commercial use?

Fed Treasury allows commercial use on its free tier, and Tax Data 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.