> For the complete documentation index, see [llms.txt](https://bluegamma.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bluegamma.io/documentation/integrations/api/how-to-guides/fetching-a-swap-rate.md).

# Fetching a Swap Rate

This is the most common use case for pulling current or historical market swap rates directly into your software or spreadsheet. For more details: <https://www.bluegamma.io/interest-rate-api>

**✅ Example: Live 10Y SOFR Swap Rate**

```python
import requests

url = "https://api.bluegamma.io/v1/swap_rate"
headers = {"x-api-key": "your_api_key_here"}
params = {
    "index": "SOFR",
    "start_date": "0D",                 # Today
    "maturity_date": "10Y",            # 10 years from today
    "fixed_leg_frequency": "1Y",
    "floating_leg_frequency": "1Y",
    "fixed_leg_day_count": "Actual360",
    "floating_leg_day_count": "Actual360"
}

response = requests.get(url, headers=headers, params=params)
print(response.json())
```

```bash
curl -X GET "https://api.bluegamma.io/v1/swap_rate?index=SOFR&start_date=0D&maturity_date=10Y&fixed_leg_frequency=1Y&floating_leg_frequency=1Y&fixed_leg_day_count=Actual360&floating_leg_day_count=Actual360" \
  -H "x-api-key: your_api_key_here"
```

Returns the **par swap rate** based on today's curve.

{% hint style="success" %}
**Want to integrate swap rates into your pricing models?** Book a 15-minute call and we'll help you get started.

[Book a demo →](https://app.lemcal.com/@alivohra/website-demo?back=1)
{% endhint %}

**📆 Example: Historical Swap Rate**

Add `valuation_time` to calculate the swap rate as it would have been on a past date/time.

```python
params["valuation_time"] = "2025-04-15T12:00:00Z"

```

```bash
curl -X GET "https://api.bluegamma.io/v1/swap_rate?index=SOFR&start_date=0D&maturity_date=10Y&fixed_leg_frequency=1Y&floating_leg_frequency=1Y&fixed_leg_day_count=Actual360&floating_leg_day_count=Actual360&valuation_time=2025-04-15T12%3A00%3A00Z" \
  -H "x-api-key: your_api_key_here"
```

This returns the rate using the market data from that exact point in time (in UTC).

🧠 **Tips**

* Use `"0D"` for today, or `"2025-12-31"` for a fixed date
* Make sure fixed and floating legs are consistent with your internal pricing
* Supported indices include: `SOFR`, `SONIA`, `6M EURIBOR`, `3M NIBOR`, and more. See a full list here <https://www.bluegamma.io/interest-rate-api>

***

**Need an API key?**\
📩 <support@bluegamma.io> | 📅 [Book a call](https://app.lemcal.com/@alivohra/website-demo?back=1)


---

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