Real-time Bond Yields API - Finnworlds

The Real-time Bond Yields API provides programmatic access to updated sovereign bond yields data across global markets. Designed for financial developers, analytics platforms, and institutional dashboards, this API allows you to get live government bond rate data — such as the U.S. 10-year yield — with accompanying percentage changes over various periods.

Make a simple GET request with a country and bond type to receive up-to-date, intraday bond yield data in JSON. The data updates approximately every 15 minutes during market hours, making it suitable for time-sensitive financial applications.

Common Use Cases

– Embedding real-time bond rates in fintech dashboards or trading platforms
– Monitoring global fixed-income trends for research and analysis
– Powering economic indicator widgets for media and financial sites
– Enhancing market sentiment analysis tools with up-to-date bond data

API Features

• Government Bond Yields – Real-time yields for various durations (e.g., 10Y, 5Y, 6M, TIPS, etc.) across countries of all regions
• Region & Country Classification – Filter and identify data by region (e.g., America, Europe) and country
• Daily Price Change – Numeric bond price movement since previous trading session
• Percentage Changes – Weekly, monthly, and annual percentage changes in bond yields
• Date & Timestamp – Timestamped data records with full datetime precision

Get started by getting your API key on the Finnworlds website.
Looking for academic or non-profit use? Send us an email to start the conversation.

How to Access the Bond Yield Data

• JSON REST API
• Excel CSV download
• PDF reports
• Email link

Documentation

Our documentation includes input parameters, output object descriptions, usage examples, and endpoint references. SDKs are available for all major languages and frameworks: Javascript, JQuery, VueJS, Angular, JAVA, PHP, NodeJS, Python, Go, Ruby, C#, R, Strest, Rust, Swift, and Scala.

Examples

https://api.finnworlds.com/api/v1/bonds?key=API_KEY&country=united_states&type=10Y

https://api.finnworlds.com/api/v1/bonds?key=API_KEY&region=europe&type=2y

{
    "status": {
        "code": 200,
        "message": "OK",
        "details": ""
    },
    "result": {
        "output": [
            {
                "region": "america",
                "country": "united states",
                "type": "10Y",
                "yield": "4.372",
                "price_change_day": "-0.0510",
                "percentage_week": "-0.07%",
                "percentage_month": "0.02%",
                "percentage_year": "0.12%",
                "datetime": "2025-07-21T00:00:00.000"
            }
        ]
    }
}

Customer Support

Need help, have questions? Get in touch with Support.

Legal

Use of the Finnworlds website, services like API and database are subject to  Finnworlds Terms & Conditions.