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Fed Treasury vs Tax Data

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

APIFed TreasuryDEAD0Tax DataDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
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?

Both are neck-and-neck — Fed Treasury and Tax Data each measure 0.0% 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.

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.