Japan JGB Yield Curve

x402

Japan JGB Yield Curve is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Returns Japan Government Bond (JGB) yield curve data across maturities (1Y–40Y) for up to 31 days of history, sourced from Japan's Ministry of Finance.

Price / call$0.003

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StatusUnknown

How this service works

244 pay-per-call data APIs for AI agents: official statistics and economy (ECB, Fed, Eurostat, World Bank, SEC, BOE, INE), crypto prices and sentiment, Spanish public data, compliance (sanctions, VAT, IBAN, LEI), science, weather, web and developer tools and local AI text tools. Pay in USDC via x402.

Output

Returns a JSON object with the latest JGB yield curve snapshot (yields_pct for maturities 1Y, 2Y, 3Y, 4Y, 5Y, 6Y, 7Y, 8Y, 9Y, 10Y, 15Y, 20Y, 25Y, 30Y, 40Y in percent), a time-series array of daily yield curves for the requested history window, the 10Y-2Y spread, country metadata, and source attribution to Japan's Ministry of Finance.

Example use cases

Daily Japan rate monitoring for macro desk

“Pull the JGB yield curve for today across all maturities and show me how much the 10Y-2Y spread has moved over the past week.”

Japan bond market briefing for investor report

“I need the full Japan government bond yield curve — 1Y through 40Y — for the last 30 days so I can chart how yields have trended this month.”

Comparing Japan and US yield curves

“Get me today's JGB yield curve from Japan's Ministry of Finance so I can compare the 10-year yield against US Treasuries and see which curve is steeper.”

Technical details

Endpoint

POSThttps://api.vextorium.com/v1/japan-jgb-yield-curve?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need official, Ministry of Finance Japan JGB yield curve data across the full maturity spectrum (1Y–40Y) with historical series. Prefer over general financial data APIs when you specifically need Japanese sovereign bond rates with authoritative sourcing and the 10Y-2Y spread pre-calculated.

Side effects

days parameter out of range (>31 or <1) may return validation error
Ministry of Finance data may be unavailable on Japanese public holidays or weekends causing stale or missing dates
Network or payment failure returns HTTP 402 if USDC payment not processed
Empty series if requested days fall entirely on non-trading days

Input

Schema · Request body

Field	Type	Description
days	integer	Days of history, 1-31 (default 10)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "date": "2026-10-19",
    "series": [
      {
        "date": "2026-10-15",
        "yields_pct": {
          "1Y": 1.652,
          "2Y": 1.913,
          "3Y": 2.045,
          "4Y": 2.209,
          "5Y": 2.331,
          "6Y": 2.431,
          "7Y": 2.535,
          "8Y": 2.686,
          "9Y": 2.818,
          "10Y": 2.948,
          "15Y": 3.489,
          "20Y": 3.786,
          "25Y": 4.048,
          "30Y": 4.024,
          "40Y": 4.031
        }
      },
      {
        "date": "2026-10-16",
        "yields_pct": {
          "1Y": 1.649,
          "2Y": 1.918,
          "3Y": 2.05,
          "4Y": 2.214,
          "5Y": 2.335,
          "6Y": 2.436,
          "7Y": 2.546,
          "8Y": 2.695,
          "9Y": 2.827,
          "10Y": 2.958,
          "15Y": 3.502,
          "20Y": 3.803,
          "25Y": 4.066,
          "30Y": 4.04,
          "40Y": 4.038
        }
      }
    ],
    "source": "Source: Ministry of Finance Japan, Interest Rate (JGB), https://www.mof.go.jp/english/policy/jgbs/reference/interest_rate/ (Public Data License 1.0). Processed by Vextorium.",
    "country": "Japan",
    "yields_pct": {
      "1Y": 1.642,
      "2Y": 1.904,
      "3Y": 2.034,
      "4Y": 2.192,
      "5Y": 2.313,
      "6Y": 2.416,
      "7Y": 2.52,
      "8Y": 2.67,
      "9Y": 2.803,
      "10Y": 2.935,
      "15Y": 3.477,
      "20Y": 3.776,
      "25Y": 4.055,
      "30Y": 4.028,
      "40Y": 4.04
    },
    "spread_10y_2y_pct": 1.031
  }
}

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