US Treasury Securities Auctions — official Fiscal Data API, no login

**Treasury auction API** — Historical U.S. Treasury auction results (Bills, Notes, Bonds, TIPS, FRNs) via the official Fiscal Data API: yield, bid-to-cover, offering amount. No login.

Historical auction results for U.S. Treasury securities — Bills, Notes, Bonds, TIPS, and Floating Rate Notes, back to 1979 — pulled from the official U.S. Department of the Treasury, Bureau of the Fiscal Service public Fiscal Data REST API (api.fiscaldata.treasury.gov). No account, no API key, no proxies.

The Fiscal Data license page states it plainly: "The data is offered free, without restriction, and available to copy, adapt, redistribute, or otherwise use for non-commercial or commercial purposes."

This is auction-level data (one row per auctioned security) — high/median/low yield, price, bid-to-cover ratio, offering amount, and competitive/noncompetitive/direct/indirect bidder totals. It's a different cut from average interest rates or exchange rates: this is what the market actually paid at each individual auction.

Tested (2026-09-02)

Target	Records returned	Notes
10-Year (security_term)	223	back to the 1970s
Bill (security_type)	8,321	all bill auctions on file
99-Year (nonexistent)	0	empty result, no error

Treasury auction API — input

{
  "targets": ["10-Year", "2-Year"],
  "maxItems": 2000
}

Each target is a security term or security type exactly as Treasury lists it (e.g. 4-Week, 13-Week, 52-Week, 2-Year, 10-Year, 30-Year, or a type like Bill, Note, Bond, TIPS, FRN). A term/type with no matching records simply returns 0 items for that target (no charge).

Treasury auction API — output fields

One dataset item per auctioned security:

Field
cusip / security_type / security_term	the instrument identifier and classification
auction_date / issue_date / maturity_date	the auction timeline
high_yield / avg_med_yield / low_yield	yield stopped out at auction
high_price / low_price / int_rate	pricing and coupon
bid_to_cover_ratio	demand strength (total bids / amount offered)
offering_amt / comp_accepted / comp_tendered / total_accepted / total_tendered	offering size and bid volume
indirect_bidder_accepted / direct_bidder_accepted	foreign/institutional vs. direct bidder allocation

No personal data: these are auction results for government securities, not individual transactions or people.

Why this over Treasury's own website

fiscaldata.treasury.gov's UI is built for browsing one dataset at a time. This actor runs a batch of security terms/types in one call and hands back structured rows — for building auction-history trackers, fixed-income research pipelines, or datasets that need this as data, not a web page.

Use Cases

• Fixed-income research — track yield and bid-to-cover trends across auctions for a given security term
• Demand analysis — compare direct / indirect / competitive bidder allocation to gauge investor appetite
• Historical rate trackers — build a time series of auction results back to the 1970s
• Macro research — correlate auction demand with broader interest-rate cycles

Pricing

Pay per event: $1.00 per 1,000 auction records collected. Nothing else.