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SEC, Treasury & Agent Utilities · x402.donnyautomation.com

US Treasury par yield curve, every constant maturity

US Treasury par yield curve, every constant maturity from 1 month to 30 years for a published business day. Returns curve[] with tenor, months and percent, spreads (2s10s, 3m10y, 5s30s) and an explicit inversion flag - the real question is whether the curve is inverted, not what fourteen numbers are. A tenor Treasury did not publish is null, never zero. Pass ?latest=1 OR ?date=YYYY-MM-DD, not both. Errors: 400 conflicting_params|bad_latest|bad_date, 404 no_curve with the available range.

Ready now4 calls · 1 buyer in 30 days

Input

YYYY-MM-DD business day, for a specific past day. A non-publication day returns 404 with the available range, not the nearest guess.
Pass latest=1 for the most recent published curve. Use instead of date, not with it.

Sample response

Published by the provider. Your run returns a fresh response.

response7 keys
attribution"Daily Treasury Par Yield Curve Rates, U.S. Department of the Treasury (public domain)."
curve3 items
date"2026-08-03"
inversion3 keys
2s10sfalse
3m10yfalse
anyInvertedfalse
isLatesttrue
spreads4 keys
2s10s0.45
3m10y0.79
5s30s0.83
unit"percentage points"
ts"2026-08-03T00:00:00.000Z"
responseobject, 7 keys
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MCP URL

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Track record

Paid calls, last 30 days
4
Buyers, last 30 days
1
Last paid call

Reported by the x402 directory.

A$0.043 per call