Polly

# Polly

> [!IMPORTANT]
> **Polly now participates in the Open Source Maintenance Fee (OSMF).**
> Starting **November 16, 2026**, companies that earn at least US $20,000 from a product or project that uses Polly will be asked to pay a US $20/month maintenance fee to help fund Polly's ongoing upkeep. The source code stays free and open, and individuals, hobbyists, and organizations below the threshold owe nothing.
>
> **We've heard your questions and want to clarify two points:**
>
> - The fee applies only to the next major version of Polly released after November 16, 2026. Existing versions of Polly are not subject to the fee.
> - Only direct references to Polly are subject to the fee. If Polly is a dependency of a different library, such as Microsoft.Extensions.Resilience or Microsoft.Extensions.Http.Resilience, the fee does not apply.
>
> Read the announcement: [Introducing the Open Source Maintenance Fee for Polly](https://thepollyproject.org/2026/07/14/polly-osmf-announcement.html) · Learn about the [OSMF](https://opensourcemaintenancefee.org) · [Become a sponsor](https://github.com/sponsors/App-vNext)

Polly is a .NET resilience and transient-fault-handling library that allows developers to express resilience strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Limiter and Fallback in a fluent and thread-safe manner.

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We are a member of the [.NET Foundation](https://www.dotnetfoundation.org/about)!

**Keep up to date with new feature announcements, tips & tricks, and other news through [www.thepollyproject.org](https://www.thepollyproject.org)**

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> [!IMPORTANT]
> This documentation describes the new Polly v8 API. If you are using the v7 API, please refer to the [previous version](https://github.com/App-vNext/Polly/tree/7.