--- title: Polly Is Going Paid. Here Are Your Options. | daily.dev description: Polly, the popular .NET resilience library, is introducing an open-source maintenance fee of $20/month per organization for companies with over $20,000 profit,... canonical: https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Polly Is Going Paid. Here Are Your Options. | daily.dev og:description: Polly, the popular .NET resilience library, is introducing an open-source maintenance fee of $20/month per organization for companies with over $20,000 profit,... og:url: https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw og:image: https://api.daily.dev/og/posts/vf0w7wHmW.png og:image:alt: Polly Is Going Paid. Here Are Your Options. og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Polly Is Going Paid. Here Are Your Options. **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 10 min read · 19 upvotes · 1 comments ## Summary Polly, the popular .NET resilience library, is introducing an open-source maintenance fee of $20/month per organization for companies with over $20,000 profit, effective November 16, 2026. The source code stays free and open on GitHub under the same license; the fee is enforced via an end-user license agreement tied to the compiled binary, applying only to direct dependencies, not transitive ones. Alternatives include using Microsoft's resilience packages (a wrapper over Polly, released around .NET 8), building Polly yourself from source, or using the community fork 'Fences' maintained by Brighter's creators from Polly 8.7.0. The video also compares download drops after three other .NET libraries (AutoMapper, Mediator, MassTransit) went commercial, showing declines of 91%, 88%, and 98% respectively, while still viewing the move favorably as fair compensation for maintainers. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How much does the Polly open source maintenance fee cost and who has to pay it? The fee is $20 per month per organization, not per project, and only applies to companies with more than $20,000 in profit that reference Polly as a direct dependency. It takes effect November 16, 2026, is enforced through an end-user license agreement tied to the downloaded binary, and does not change Polly's open source license or make the source code private. _Teams budgeting for dependency costs can track changes like Polly's maintenance fee on daily.dev._ ### How can I keep using Polly in .NET without paying the open source maintenance fee? Replace the direct Polly package reference with Microsoft.Extensions.Resilience, which wraps Polly internally, since the fee only applies to direct dependencies, not transitive ones. Other options include building Polly from source yourself, or switching to Fences, a community fork maintained by Brighter's creators, forked from Polly version 8.7.0 specifically to avoid the fee. _Developers weighing migration paths for paid dependencies can follow options like these on daily.dev._ ### How much did AutoMapper, Mediator, and MassTransit downloads drop after going commercial? AutoMapper dropped from an average of 150 million to 17 million downloads per major version, a 91% decline. Mediator fell from 107 million to 10 million downloads, an 88% drop. MassTransit dropped from 107 million to 2 million downloads, a 98% decline, all after their creators moved the libraries to a commercial model. _Developers evaluating open-source monetization trends can track outcomes like these on daily.dev._ ## Community discussion Top comments from developers on daily.dev. **@sevensolutions** · 1 upvotes > Here we go again 🙈 ## Similar posts on daily.dev - [Why Are .NET Libraries Going Paid? The Open Source Cost AI Can’t Erase](https://daily.dev/posts/why-are-net-libraries-going-paid-the-open-source-cost-ai-can-t-erase-bnptxyznc) · We Are .NET · 8 upvotes · 0 comments - [Stop Your AI Agent Picking the Wrong .NET Libraries](https://daily.dev/posts/stop-your-ai-agent-picking-the-wrong-net-libraries-m6tagi9al) · Code with Mukesh · 3 upvotes · 0 comments --- Tags: [#open-source](https://daily.dev/tags/open-source), [#.net](https://daily.dev/tags/.net), [#nuget](https://daily.dev/tags/nuget) [View this post on daily.dev](https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Polly Is Going Paid. Here Are Your Options.","url":"https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw"},"datePublished":"2026-10-01T12:48:06.338Z","dateModified":"2026-10-01T12:48:24.723Z","description":"Polly, the popular .NET resilience library, is introducing an open-source maintenance fee of $20/month per organization for companies with over $20,000 profit,...","image":"https://i.ytimg.com/vi/WwaagsisO1o/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/WwaagsisO1o/sddefault.jpg","isAccessibleForFree":true,"articleSection":"We Are .NET","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"We Are .NET","logo":"https://media.daily.dev/image/upload/s--BsnVOa3i--/f_auto/v1718347410/logos/wearedotnet","url":"https://daily.dev/sources/wearedotnet"},"commentCount":1,"discussionUrl":"https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":19},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":1}],"keywords":"open-source,.net,nuget","timeRequired":"PT10M","video":{"@type":"VideoObject","name":"Polly Is Going Paid. Here Are Your Options.","description":"Polly, the popular .NET resilience library, is introducing an open-source maintenance fee of $20/month per organization for companies with over $20,000 profit,...","thumbnailUrl":"https://i.ytimg.com/vi/WwaagsisO1o/sddefault.jpg","uploadDate":"2026-10-01T12:48:06.338Z","duration":"PT10M","url":"https://api.daily.dev/r/vf0w7wHmW","embedUrl":"https://www.youtube.com/embed/WwaagsisO1o"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"We Are .NET","item":"https://daily.dev/sources/wearedotnet"},{"@type":"ListItem","position":3,"name":"Polly Is Going Paid. Here Are Your Options."}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw","comment":[{"@type":"Comment","text":"Here we go again 🙈","datePublished":"2026-10-04T17:32:44.715Z","url":"https://daily.dev/posts/vf0w7wHmW#c-DasKFDjmc","author":{"@type":"Person","name":"Daniel Peinhopf","url":"https://daily.dev/sevensolutions","image":"https://avatars.githubusercontent.com/u/84123899?v=4"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1}}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/polly-is-going-paid-here-are-your-options--vf0w7whmw#faq","mainEntity":[{"@type":"Question","name":"How much does the Polly open source maintenance fee cost and who has to pay it?","acceptedAnswer":{"@type":"Answer","text":"The fee is $20 per month per organization, not per project, and only applies to companies with more than $20,000 in profit that reference Polly as a direct dependency. It takes effect November 16, 2026, is enforced through an end-user license agreement tied to the downloaded binary, and does not change Polly's open source license or make the source code private. Teams budgeting for dependency costs can track changes like Polly's maintenance fee on daily.dev."}},{"@type":"Question","name":"How can I keep using Polly in .NET without paying the open source maintenance fee?","acceptedAnswer":{"@type":"Answer","text":"Replace the direct Polly package reference with Microsoft.Extensions.Resilience, which wraps Polly internally, since the fee only applies to direct dependencies, not transitive ones. Other options include building Polly from source yourself, or switching to Fences, a community fork maintained by Brighter's creators, forked from Polly version 8.7.0 specifically to avoid the fee. Developers weighing migration paths for paid dependencies can follow options like these on daily.dev."}},{"@type":"Question","name":"How much did AutoMapper, Mediator, and MassTransit downloads drop after going commercial?","acceptedAnswer":{"@type":"Answer","text":"AutoMapper dropped from an average of 150 million to 17 million downloads per major version, a 91% decline. Mediator fell from 107 million to 10 million downloads, an 88% drop. MassTransit dropped from 107 million to 2 million downloads, a 98% decline, all after their creators moved the libraries to a commercial model. Developers evaluating open-source monetization trends can track outcomes like these on daily.dev."}}]} ```