Historical Bond Yields API – Government Bonds Time-Series Data

What is the Historical Bond Yields API?

Historical Bond Yields API by Fin2Dev returns historical yield data for government bonds worldwide, including 10-year treasury rate history for the US and other major economies. You can filter by country, type (maturity), set a frequency (day/month), and define a date_from / date_to range.

10-Year Treasury Yield History

Looking specifically for 10 year treasury yield history? Set country=united_states and type=10y to pull daily or monthly data for any date range — the same call also works for Germany, the UK, Japan and other markets.

Data Structure & Fields

Every API response returns a standardized JSON object containing metadata and an array of historical closing yields. No complex parsing required.

API Integration Examples

• Python
• PHP

import requests

url = "https://apidata.fin2dev.com/v1/bondshistorical"
params = {
    "key": "YOUR_API_KEY",
    "country": "germany",
    "type": "2y",
    "date_from": "2010-01-01",
    "date_to": "2010-01-10"
}

response = requests.get(url, params=params)
data = response.json()

for item in data["result"]["output"]["prices"]:
    print(item["date_time"], item["price"])

<?php
$key = "YOUR_API_KEY";
$url = "https://apidata.fin2dev.com/v1/bondshistorical?key=$key&country=germany&type=2y&date_from=2010-01-01&date_to=2010-01-10";

$json = file_get_contents($url);
$data = json_decode($json, true);

foreach ($data['result']['output']['prices'] as $row) {
    echo $row['date_time'] . " " . $row['price'] . "\n";
}
?>

Example JSON Response

{
  "status": { "code": 200, "message": "OK", "details": "" },
  "result": {
    "basics": { "frequency": "1d" },
    "output": {
      "region": "europe",
      "country": "Germany",
      "bond_type": "2y",
      "prices": [
        { "price": "1.251", "date_time": "2010-01-08" },
        { "price": "1.293", "date_time": "2010-01-07" },
        { "price": "1.321", "date_time": "2010-01-06" },
        { "price": "1.311", "date_time": "2010-01-05" },
        { "price": "1.366", "date_time": "2010-01-04" },
        { "price": "1.323", "date_time": "2010-01-01" }
      ]
    }
  }
}

Common Historical Queries

Frequently Asked Questions