LastLook Data — 30-Year Treasury Yield for Specific Date

x402

LastLook Data — 30-Year Treasury Yield for Specific Date is a paid API for AI agents from api.lastlookdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the 30-year US Treasury constant maturity yield (DGS30) for a specific historical date.

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How this service works

LastLook Data — 30-year Treasury yield for a specific date. Alias for /api/date?id=DGS30&d=YYYY-MM-DD.

Output

Returns the 30-year US Treasury constant maturity yield (DGS30) for the requested date, typically as a numeric percentage value (e.g. 3.84) along with the date queried.

Example use cases

Yield on Fed rate hike day

“What was the 30-year Treasury yield on November 2, 2022, the day the Fed raised rates by 75 basis points? I want to see where long-term rates stood at that moment.”

Historical mortgage rate research

“I'm trying to understand where long-term borrowing costs were back in January 2019. Can you look up the 30-year Treasury yield for January 10, 2019?”

Compare yields across market events

“Pull the 30-year Treasury yield for March 23, 2020 — that was near the COVID market bottom — so I can compare it to where rates are today.”

Technical details

Endpoint

GEThttps://api.lastlookdata.com/api/treasury/date

When to prefer

Use this endpoint when you need the 30-year Treasury yield (DGS30) for a single specific historical date. Prefer this over the /api/current endpoint when you need a past value, and prefer it over the /api/recent or /api/date generic endpoints when you specifically want the 30-year tenor without specifying a series ID manually.

Side effects

Date falls on a weekend or federal holiday when markets are closed — no data available for that date
Date is out of the supported historical range — series may not go back far enough
Invalid date format (not YYYY-MM-DD) — request will fail with a validation error
Future dates — no yield data available yet
Missing required 'd' query parameter — returns error

Input

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "d": "2023-03-15"
    }
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "date": "2023-03-15",
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)",
  "series": "DGS30 - 30-Year Treasury Constant Maturity Rate",
  "service": "LastLook Data",
  "yield_percent": 3.7
}

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Example use cases

Yield on Fed rate hike day

“What was the 30-year Treasury yield on November 2, 2022, the day the Fed raised rates by 75 basis points? I want to see where long-term rates stood at that moment.”

Historical mortgage rate research

“I'm trying to understand where long-term borrowing costs were back in January 2019. Can you look up the 30-year Treasury yield for January 10, 2019?”

Compare yields across market events

“Pull the 30-year Treasury yield for March 23, 2020 — that was near the COVID market bottom — so I can compare it to where rates are today.”

Technical details

Endpoint

GEThttps://api.lastlookdata.com/api/treasury/date

When to prefer

Side effects

Date falls on a weekend or federal holiday when markets are closed — no data available for that date
Date is out of the supported historical range — series may not go back far enough
Invalid date format (not YYYY-MM-DD) — request will fail with a validation error
Future dates — no yield data available yet
Missing required 'd' query parameter — returns error

Input

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "d": "2023-03-15"
    }
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "date": "2023-03-15",
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)",
  "series": "DGS30 - 30-Year Treasury Constant Maturity Rate",
  "service": "LastLook Data",
  "yield_percent": 3.7
}