# Public Website Curves vs. Platform Curves

BlueGamma shows interest rate curves in two places, and they come from different upstream feeds. This page explains the difference so you know which one to use.

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## The short answer

|                                       | **Public website**                                                                                         | **Platform (app, API, Excel Add-in)**                                                                              |
| ------------------------------------- | ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| Where                                 | Marketing pages on [bluegamma.io](https://www.bluegamma.io) (e.g. `/sonia-swap-rates`, `/sofr-swap-rates`) | [app.bluegamma.io](https://app.bluegamma.io), [api.bluegamma.io](https://api.bluegamma.io), BlueGamma Excel Add-in |
| Purpose                               | Marketing and quick reference                                                                              | Modelling, valuation, risk, pricing                                                                                |
| Data                                  | End-of-day snapshot from a separate marketing feed                                                         | BlueGamma's primary rate feed, updated intraday                                                                    |
| Calibration                           | Raw rates, not bootstrapped                                                                                | Bootstrapped into calibrated zero, discount and forward curves                                                     |
| Recommended for production modelling? | No                                                                                                         | Yes                                                                                                                |

***

## Why they differ

The public website curves exist to give visitors a quick snapshot of where rates are today. They are updated end-of-day and are presented as a reference only.

The platform curves (app, API, Excel Add-in) all share a single primary feed that is ingested continuously during market hours and run through the BlueGamma curve construction engine, which bootstraps calibrated zero, discount and forward curves. These are the curves you see in the app, the curves returned by every `api.bluegamma.io/v1/*` endpoint, and the curves the Excel Add-in formulas resolve to.

Because the two have different snapshot timings and different levels of processing, you will see small numerical differences between the website curve and the platform curve for the same index on the same day. This is expected.

***

## Which should I use?

Use the **platform** (app, API, or Excel Add-in) for anything you intend to rely on: pricing, valuation, risk, reporting, or any downstream modelling. The curves on the public marketing pages are not intended for that use and we do not recommend relying on them.

If you need to validate platform data against another provider, see:

{% content-ref url="/pages/fdpIgta8cl9r4C4XFThe" %}
[Validating BlueGamma API Data Against Bloomberg or Other Platforms](/documentation/integrations/api/how-to-guides/validating-bluegamma-api-data-against-bloomberg-or-other-platforms.md)
{% endcontent-ref %}

***

## Related

* [How We Bootstrap the Yield Curve](/documentation/methodology/how-to-bootstrap-the-yield-curve.md)
* [Available Indices](/documentation/integrations/available-indices.md)
* [API Reference](/documentation/integrations/api/api-reference.md)


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