SkyPirl Blockchain
  • SkyPirl (Pirl)
    • Docs.Pirl.io
    • About SkyPirl (Pirl)
    • Mission
    • Create SkyPirl 2.0 wallet
    • Restore wallet with secret 12 phrase
    • How to be a Nominator
    • SkyPirl coin specifications
    • Run a validator
    • How to unbound fund
    • How payout works
    • How to vote for Council
    • How to set identity
    • SLASHES
    • Refund of slashed
    • COIN SPECIFICATION
    • Governance and Treasury
    • Telemetry
    • List of wallet addresses not working
    • Spend from the treasury and Burn
    • Mint coins and transfer coins to the treasury
      • Treasury2
    • Burn2
    • Source Code
    • List of wallets holding coins of burned wallets with PIRL balance at block 3939000
  • About SkyPirl (Pirl)
  • Mission
  • PIRLmeet.com
    • About PIRLmeet.com
    • Free Trial
    • CINEMA
    • Microphone On-Off
    • Screen Sharing
      • Share—or don't share your audio
      • Video recording tutorial + camera + mp4 video download
    • Hands Up
    • Change the ringtone when giving a raise of hand
    • Stream MP4 videos
    • Stream mp4 video on Firefox browser
    • Cabinet Lock
      • Cabinet Lock account
      • Normal-Demo
      • How can I cabinet lock and keep strangers from entering the room?
      • How can I add people to the room when the room is locked?
    • Text chat
      • Room chat
      • Cabinetlock Chat
      • private chat per video
    • Connect Pirl wallet to Room-House
    • Change cover photo
    • Video title name
    • Setting up you own Room-House
    • How to download videos on youtube, Facebook and convert to mp4 files
    • Use camera beautification App when livestream
    • PIRLmeet can create meetings that last 24/7 and 365 days a year.
    • How does PIRLmeet secure products?
    • Get Pirl coin when playing videos on Room-house
    • Picture
    • OBS Studio
      • Download
      • Screen sharing and front camera
      • Stream video from R-H to Youtube
      • Stream games
      • Stream Video and Record Video and download videos
      • Good quality video settings
      • Edit the frame and choose the recording frame
    • Source Code
  • Game
    • Room-House.com and games
    • Slot Machine
      • Connect the slot machine to the SkyPirl Light Wallet.
      • Connect Room-House.com to the slot machine
  • SkyPirl Light Wallet
  • PIRL Decentralized Charity Foundation
  • SkyPirl Community
  • Apps for Android and IOS (PWA)
    • Android
    • Iphone (IOS)
    • Computer-Windows-PC
  • Business Paradigm R-H
    • Use SkyPirl coin to pay in Room-House.com
  • Roadmap
  • Core Team
  • xTer . Technology
    • About xTER SafeContainer
    • xTer Ecosystem
    • xTer SkyPirl
    • xTer Room-House
      • How to Room-House
    • xTer Room-House Plus
      • How to xTer room-House plus
    • xTer TrueAD
    • xTer SmartFilter
  • White Paper
  • Blog
    • News
      • ------What is Web 1.0, 2.0, 3.0?------
      • The world's first decentralized audio chat room Room-House
      • What's so special about decentralized audio chat rooms?
      • Features that make Room-House.com decentralized chat rooms competitive with giants
      • Ever heard of Decentralized Charity Fund?
      • What is online meeting? 4 most effective online conferencing solutions
      • What is online meeting? Is it easy or difficult to organize?
      • What is the standard of a professional online meeting room?
      • History of the world's first online meeting software
      • Decentralized Application Room-House.com (Daap)
      • In what year was the internet born? And the birth of the project SkyPirl
      • Cooperation between Room-House and Russian State Social University
      • Building SkyPirl Decentralized Internet in Space
      • Data collection is a huge industry that operates in the dark
      • Free and easy decentralized internet for everyone to use
      • What is Pirl (PIRL) ? Community Based Project Pioneering in Introducing Masternode Technology
      • PirlGuard — Innovative Solution against 51% Attacks
      • ETC and PirlGuard Cybersecurity Plan
      • PirlChat messenger release
      • Overview of PirlChat 0.5.1–0.6 Beta Versions
      • Decentralized blockchain messengers
      • PirlChat messenger version 1.0.4 released
      • What is Pirl 2.0 and what changes will come to the Pirl network
      • The Pirl project announced the launch of its own exchange
      • PIRL’s Content Masternodes Are Almost Out: What You Need to Know
      • PIRL Masternodes and DApps Overview
      • PIRL Decentralized Charity Foundation - SkyPirl
      • Thanks to PirlGuard, Callisto is protected against 51% attacks
      • What is SkyPirl(PIRL) project?
      • Here is the sci-fi story of the decentralized social network PIRL:
      • What is Callisto-Pirl.com project?
      • Here is the legend of the multi-planetary decentralized internet space station PIRL:
      • PIRL decentralized social network has the following key differences:
      • The SM feature of the decentralized social network PIRL seems to be an interesting secret.
      • SkyPirl(PIRL) is designed to attract investors with attractive features:
      • SkyPirl project does not sell ICO (Initial Coin Offering) or not raise funds for the following reaso
      • Merry Christmas and a Happy New Year! SkyPirl Callisto-Pirl.com
      • SkyPirl Project Merry Christmas Story:
      • Happy New Year! SkyPirl Callisto-Pirl.com
      • Here's the story of the SkyPirl Mars Exploration Project:
      • Multiplanetary Billionaire
      • Lost in space
      • The Last Space Train
      • The future of society: Polarization of rich and poor in the 4.0 revolution
      • Callisto-Pirl.com Civil War
      • Callisto-Pirl.com Civil War 2
      • Callisto-Pirl.com Civil War 3
      • Callisto-Pirl.com Civil War 4
      • Callisto-Pirl.com Civil War 5
      • Callisto-Pirl.com Civil War 6
      • Callisto-Pirl.com Civil War 7
      • Callisto-Pirl.com Civil War 8
      • Callisto-Pirl.com Civil War 9
      • Callisto-Pirl.com Civil War 10
      • Callisto-Pirl.com Civil War 11
      • Callisto-Pirl.com Civil War 12
      • Page 6
      • Page 5
      • Page 4
      • Page 3
      • Page 2
      • Page 1
      • Page
    • Technical
      • What is Bitcoin? How are Bitcoins created?
      • Export Your Private Key from Third-Party Wallets
      • What Is a Stablecoin?
      • What Is Wrapped Bitcoin?
      • 7 Ways to Generate Passive Income With Crypto
      • What is a decentralized social network?
      • How many Bitcoins can be mined in a day?
      • How many Bitcoins are there in the world?
      • What is a decentralized exchange? different from centralized floor?
      • What is Staking? 5 things to note when investing in Staking
      • What Are Blockchain Bridges?
      • Compare Hot Wallet and Cold Wallet, which one should you use?
      • What is NFT?
      • Building a Decentralized Internet in Space
      • Web 3.0 Paradox
      • Controversy about the future of the Internet
      • The metaverse virtual universe could revolutionize the Internet
      • 'Blockchain is the most influential technology since the Internet'
      • Web3 - Expectations for the Decentralized Internet
      • What is Dapp? The concept of Dapp and their classification
      • How Decentralized Web Browsers Give You Unsurpassed Privacy
      • Is Web 3.0 being hyped?
      • What are Nodes? Types of Nodes in Blockchain
      • Blockchain can be hacked or not?
      • What is Private Key and Public Key in Bitcoin?
      • What is a Nonce in Blockchain?
      • What is Decentralized Autonomous Cooperative (DAC)?
      • What is Genesis Block?
      • What is Web3? Explaining the Decentralized Internet of the Future
      • Z-Consensus CLO
      • DEX223 Explanation
      • CLOIP
        • CLOIP-1
        • CLOIP-2
        • CLOIP-3
        • CLOIP-4
      • Skuld Hard Fork: Transforming Callisto Network with Dynamic Monetary Policy
      • Dex223 ICO
      • CoinSavi là gì?
      • SLOFI Token
    • Pi NetWork
      • Pi NetWork ( English )
        • Pi Network (PI) Mining Step by Step Guide
        • How to Create a Pi Wallet
        • How to KYC Pi Network 100% Success (2023)
        • Pi Network Security Circle: How to Add Users to Security Circle?
        • How to Migrate Your Mining Pi Coin to Mainnet in 8 Steps (See Video)
        • Why Pi Network can become the most active existence of mobile smart cryptocurrency?
        • FAQ? (FAQ)
      • Pi NetWork ( Tiếng Việt)
        • Pi NetWork là gì?
        • Cách KYC Pi Network 100% thành công (2023)
        • Vòng tròn bảo mật là gì?
        • Hướng dẫn tạo ví Pi Network
        • Cách Đào Pi Trên Điện Thoại
        • Cài đặt tên như thế nào là đúng trong Pi Network
        • Bạn cần xác nhận ngay VÍ PI THẬT để chuẩn bị chuyển SỐ PI XỊN vào ví pi sau khi hoàn thành KYC.
        • Hướng dẫn cách rút chuyển Pi về Ví Mainnet
        • Cách tăng tốc độ Đào Pi Network
        • Tại sao Pi Network có thể trở thành sự tồn tại tích cực nhất của tiền điện tử thông minh di động?
        • Hỏi đáp (FAQ)
    • Việt Nam
      • Pirl (PIRL) Là Gì ? Dự Án Dựa Trên Cộng Đồng Đi Tiên Phong Trong Việc Giới Thiệu Công Nghệ Masternod
      • Giới thiệu về SkyPirl (Pirl)
      • Sứ Mệnh Pirl2.0
      • Phần mềm Room-House.com là gì
      • Giới thiệu về Room-House.com
      • Room-House có thể tạo các cuộc họp kéo dài 24/7 và 365 ngày một năm.
      • Room-House.com bảo mật sản phẩm như thế nào?
      • Giới thiệu về xTER SafeContainer
      • Kế hoạch an ninh mạng của ETC và PirlGuard
      • Quỹ từ thiện phi tập trung Pirl
      • Phát hành trình nhắn tin PirlChat
      • Tổng quan về các phiên bản Beta của PirlChat 0.5.1–0.6
      • Trình nhắn tin chuỗi khối phi tập trung
      • PirlChat messenger phiên bản 1.0.4 được phát hành
      • Pirl 2.0 là gì và những thay đổi nào sẽ đến với mạng Pirl
      • Dự án Pirl đã công bố ra mắt sàn giao dịch của riêng mình
      • Masternode nội dung của PIRL sắp hết: Những điều bạn cần biết
      • Tổng quan về PIRL Masternodes và DApps
      • Xây dựng Internet phi tập trung SkyPirl trong không gian
      • Nhờ PirlGuard, Callisto được bảo vệ chống lại các cuộc tấn công 51%
    • Russia
      • ------Что такое Web 1.0, 2.0, 3.0?------
      • Первый в мире децентрализованный аудиочат Room-House
      • Что такого особенного в децентрализованных аудиочатах?
      • Функции, которые делают децентрализованные чаты Room-House.com конкурентоспособными с гигантами
      • Вы когда-нибудь слышали о Децентрализованном благотворительном фонде?
      • Что такое онлайн-встреча? 4 самых эффективных решения для онлайн-конференций
      • Что такое онлайн-встреча? Легко или сложно это организовать?
      • Каков стандарт профессионального онлайн-зала для встреч?
      • История первого в мире программного обеспечения для онлайн-встреч
      • Децентрализованное приложение Room-House.com (Daap)
      • В каком году родился Интернет? И рождение проекта SkyPirl
      • Сотрудничество Room-House и Российского государственного социального университета
      • Создание децентрализованного Интернета SkyPirl в космосе
      • Сбор данных — это огромная индустрия, которая работает в темноте
      • Бесплатный и простой децентрализованный Интернет, которым может пользоваться каждый.
      • Что такое Пирл (PIRL)? Пионерский проект сообщества по внедрению технологии мастернод
      • PirlGuard — инновационное решение против атак 51%
      • План кибербезопасности ETC и PirlGuard
      • Релиз мессенджера PirlChat
      • Обзор бета-версий PirlChat 0.5.1–0.6
      • Децентрализованные мессенджеры на блокчейне
      • Вышла версия мессенджера PirlChat 1.0.4
      • Что такое Pirl 2.0 и какие изменения произойдут в сети Pirl
      • Проект Pirl объявил о запуске собственной биржи
      • Мастерноды контента PIRL почти закончились: что вам нужно знать
      • Обзор мастернод PIRL и DApps
      • Децентрализованный благотворительный фонд PIRL
      • Благодаря PirlGuard Каллисто защищен от атак 51%
    • China
      • ------什么是Web 1.0、2.0、3.0?------
      • 全球首个去中心化音频聊天室Room-House
      • 去中心化音频聊天室有什么特别之处?
      • 让 Room-House.com 去中心化聊天室与巨头竞争的功能
      • 听说过去中心化慈善基金吗?
      • 什么是线上会议?4种最有效的在线会议解决方案
      • 什么是线上会议?组织起来容易还是困难?
      • 专业的网络会议室的标准是什么?
      • 世界上第一个在线会议软件的历史
      • 去中心化应用室-House.com (Daap)
      • 互联网诞生于哪一年?SkyPirl 项目的诞生
      • Room-House与俄罗斯国立社会大学合作
      • 在太空中构建 SkyPirl 去中心化互联网
      • 数据收集是一个在黑暗中运作的庞大行业
      • 免费且简单的去中心化互联网,供所有人使用
      • 什么是皮尔(PIRL)?基于社区的项目开创了引入主节点技术的先河
      • PirlGuard — 针对 51% 攻击的创新解决方案
      • ETC 和 PirlGuard 网络安全计划
      • PirlChat 即时通讯软件发布
      • PirlChat 0.5.1–0.6 Beta 版本概述
      • 去中心化区块链信使
      • PirlChat 即时通讯软件 1.0.4 版发布
      • 什么是 Pirl 2.0,Pirl 网络将发生哪些变化
      • Pirl项目宣布推出自己的交易所
      • PIRL 的内容主节点即将退出:您需要了解的内容
      • PIRL 主节点和 DApp 概述
      • PIRL 去中心化慈善基金会
      • PirlGuard – 51% 攻击防护
    • Japan
      • -------Web 1.0、2.0、3.0とは何ですか?------
      • 世界初の分散型音声チャットルーム Room-House
      • 分散型音声チャット ルームの何がそんなに特別なのでしょうか?
      • Room-House.com の分散型チャット ルームを大手企業と競争できるようにする機能
      • 分散型慈善基金について聞いたことがありますか?
      • オンライン会議とは何ですか?最も効果的な 4 つのオンライン会議ソリューション
      • オンライン会議とは何ですか?整理するのは簡単ですか、それとも難しいですか?
      • プロフェッショナルなオンライン会議室の基準は何ですか?
      • 世界初のオンライン会議ソフトウェアの歴史
      • 分散型アプリケーション Room-House.com (Daap)
      • インターネットが誕生したのは何年ですか? そしてSkyPirlプロジェクトの誕生
      • SkyPirl 分散型インターネットを宇宙に構築する
      • データ収集は暗闇で行われる巨大産業です
      • 誰もが使える無料で簡単な分散型インターネット
      • ピル(PIRL)とは何ですか?マスターノードテクノロジーの導入における先駆的なコミュニティベースのプロジェクト
      • PirlGuard — 51% 攻撃に対する革新的なソリューション
      • ETC および PirlGuard サイバーセキュリティ プラン
      • PirlChatメッセンジャーのリリース
      • PirlChat 0.5.1 ~ 0.6 ベータ版の概要
      • 分散型ブロックチェーンメッセンジャー
      • PirlChat メッセンジャー バージョン 1.0.4 がリリースされました
      • Pirl 2.0 とは何か、Pirl ネットワークにどのような変更が加えられるか
      • Pirlプロジェクトが独自の取引所の立ち上げを発表
      • PIRL のコンテンツ マスターノードが間もなく終了します: 知っておくべきこと
      • PIRL マスターノードと DApps の概要
      • PIRL 分散型慈善財団
      • PirlGuard のおかげで、Callisto は 51% の攻撃から保護されています
    • Hindi
      • ------वेब 1.0, 2.0, 3.0 क्या है?------
      • Page दुनिया का पहला विकेन्द्रीकृत ऑडियो चैट रूम रूम-हाउस
      • विकेन्द्रीकृत ऑडियो चैट रूम के बारे में क्या खास है?
      • ऐसी विशेषताएँ जो रूम-हाउस.कॉम विकेंद्रीकृत चैट रूम को दिग्गजों के साथ प्रतिस्पर्धी बनाती हैं
      • क्या आपने कभी विकेंद्रीकृत चैरिटी फंड के बारे में सुना है?
      • ऑनलाइन मीटिंग क्या है? 4 सबसे प्रभावी ऑनलाइन कॉन्फ्रेंसिंग समाधान
      • ऑनलाइन मीटिंग क्या है? क्या इसे व्यवस्थित करना आसान है या कठिन?
      • एक पेशेवर ऑनलाइन मीटिंग रूम का मानक क्या है?
      • दुनिया के पहले ऑनलाइन मीटिंग सॉफ़्टवेयर का इतिहास
      • विकेन्द्रीकृत अनुप्रयोग रूम-हाउस.कॉम (डीएएपी)
      • इंटरनेट का जन्म किस वर्ष हुआ था? और प्रोजेक्ट स्काईपिरल का जन्म
      • अंतरिक्ष में स्काईपिरल विकेन्द्रीकृत इंटरनेट का निर्माण
      • डेटा संग्रह एक बहुत बड़ा उद्योग है जो अंधेरे में काम करता है
      • हर किसी के उपयोग के लिए मुफ़्त और आसान विकेन्द्रीकृत इंटरनेट
      • पर्ल (PIRL) क्या है? समुदाय आधारित परियोजना मास्टर्नोड प्रौद्योगिकी के परिचय में अग्रणी है
      • पिरलगार्ड - 51% हमलों के खिलाफ अभिनव समाधान
      • ईटीसी और पिरलगार्ड साइबर सुरक्षा योजना
      • PirlChat मैसेंजर रिलीज़
      • PirlChat 0.5.1–0.6 बीटा संस्करणों का अवलोकन
      • विकेन्द्रीकृत ब्लॉकचेन संदेशवाहक
      • PirlChat मैसेंजर संस्करण 1.0.4 जारी किया गया
      • Pirl 2.0 क्या है और Pirl नेटवर्क में क्या बदलाव आएंगे
      • पर्ल प्रोजेक्ट ने अपने स्वयं के एक्सचेंज के लॉन्च की घोषणा की
      • पीआईआरएल के कंटेंट मास्टरनोड्स लगभग समाप्त हो चुके हैं: आपको क्या जानना चाहिए
      • पीआईआरएल मास्टरनोड्स और डीएपी अवलोकन
      • पीआईआरएल विकेंद्रीकृत चैरिटी फाउंडेशन
      • PirlGuard को धन्यवाद, कैलिस्टो 51% हमलों से सुरक्षित है
    • Charity
      • Децентрализованный благотворительный фонд PIRL
      • PIRL 去中心化慈善基金会
      • PIRL 分散型慈善財団
      • Yayasan Amal Terdesentralisasi PIRL
      • PIRL विकेंद्रीकृत चैरिटी फाउंडेशन
      • Fundación Benéfica Descentralizada PIRL
      • Pirl المؤسسة الخيرية اللامركزية
      • קרן צדקה מבוזרת של PIRL
      • PIRL 분산형 자선 재단
      • PIRL Dezentrale Wohltätigkeitsstiftung
      • Ang mga desentralisadong charity fund Pirl
      • ມູນນິທິການກຸສົນ PIRL Decentralized
      • PIRL Decentralized caritas Foundation
      • มูลนิธิ PIRL Decentralized Charity Foundation
      • PIRL төвлөрсөн бус буяны сан
      • PIRL Weqfa Xêrxwazî ​​ya Nenavendî
      • Fundacja Dobroczynności Zdecentralizowanej PIRL
      • PIRL Gedesentraliseerde Liefdadigheidstigting
      • PIRL Adɔe Fapem a Wɔde Di Dwuma wɔ Decentralized
      • Fondacioni i Decentralizuar i Bamirësisë PIRL
      • PIRL ያልተማከለ የበጎ አድራጎት ድርጅት
      • PIRL ապակենտրոնացված բարեգործական հիմնադրամ
      • PIRL Mərkəzləşdirilməmiş Xeyriyyə Fondu
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On this page
  • Fee Calculation​
  • Block Limits and Transaction Priority​
  • Fees​
  • Calcuating Fees with Polkadot-JS​
  • Shard Transactions​
  • Other Resource Limitation Strategies​
  • Advanced​
  • Learn More​
  1. FAQ?
  2. Learn
  3. Basics
  4. Transactions

Transaction Fees

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Last updated 1 year ago

Several resources in a blockchain network are limited, for example, storage and computation. Transaction fees prevent individual users from consuming too many resources. Polkadot uses a weight-based fee model as opposed to a gas-metering model. As such, fees are charged prior to transaction execution; once the fee is paid, nodes will execute the transaction.

designed the Polkadot fee system with the following objectives:

  • Each Relay Chain block should be processed efficiently to avoid delays in block production.

  • The growth rate of the Relay Chain should be bounded.

  • Each block should have space for special, high-priority transactions like misconduct reports.

  • The system should be able to handle spikes in demand.

  • Fees should change slowly so that senders can accurately predict the fee for a given transaction.

Fee Calculation

Fees on the Polkadot Relay Chain are calculated based on three parameters:

  • A Weight fee

    • Base weight

    • Call(s) weight

  • A Length fee

  • A Tip (optional).

As a permissionless system, the Polkadot network needs to implement a mechanism to measure and to limit the usage in order to establish an economic incentive structure, to prevent the network overload, and to mitigate DoS vulnerabilities. Polkadot enforces a limited time-window for block producers to create a block, including limitations on block size, which can make the selection and execution of certain extrinsics too expensive and decelerate the network. Extrinsics which require too many resources are discarded by the network.

Polkadot defines a specified ensuring that only a certain portion of the total block size gets used for regular extrinsics. The remaining space is reserved for critical, operational extrinsics required for the functionality by network itself.

This is handled by a system, where the cost of the transactions (referred to as ) are determined before execution. Weights are a fixed set of numbers used in Substrate-based chains to manage the time it takes to validate a block. Each transaction has a base weight that accounts for the overhead of inclusion (e.g. signature verification) and a dispatch weight that accounts for the time to execute the transaction. All weights, even the base weight, are a measure of time to execute on some standard hardware.

The weight fee is the sum of the base weight and the sum of the total weight consumed by call(s).

A TRANSACTION CAN INCLUDE SEVERAL CALLS

For instance, a batch can contain bond and nominate, and the weight would be one base weight and then the sum of the weights for bond and nominate.

The length fee is a per-byte fee multiplier for the size of the transaction in bytes.

There is also a targeted fee adjustment that serves as a multiplier which tunes the final fee based on network congestion. This can constitute an adjusted weight fee calculated as the targeted fee adjustment times the weight fee.

Together, these fees constitute the inclusion fee. The inclusion fee is the base fee plus the length fee plus the adjusted weight fee.

Tips are an optional transaction fee that users can add. Tips are not part of the inclusion fee and are an incentive to block authors for prioritizing a transaction, and the entire tip goes directly to the block author.

Final weights are assigned based on the worst case scenario of each runtime function. The runtime has the ability to "refund" the amount of weight which was overestimated once the runtime function is actually executed.

The runtime only returns weights if the difference between the assigned weight and the actual weight calculated during execution is greater than 20%.

Checkout some examples of how various weights are gauged in the Polkadot runtime for several different types of operations:

Blocks in Polkadot have both a maximum length (in bytes) and a maximum weight. Block producers will fill blocks with transactions up to these limits. A portion of each block - currently 25% - is reserved for critical transactions that are related to the chain's operation. Block producers will only fill up to 75% of a block with normal transactions. Some examples of operational transactions:

  • Misbehavior reports

  • Council operations

  • Member operations in an election (e.g. renouncing candidacy)

Block producers prioritize transactions based on each transaction's total fee. Since a portion of the fee will go to the block producer, producers will include the transactions with the highest fees to maximize their reward.

Block producers charge a fee in order to be economically sustainable. That fee must always be covered by the sender of the transaction. Polkadot has a flexible mechanism to determine the minimum cost to include transactions in a block.

Transaction volume on blockchains is highly irregular, and therefore transaction fees need a mechanism to adjust. However, users should be able to predict transaction fees.

Polkadot uses a slow-adjusting fee mechanism with tips to balance these two considerations. In addition to block limits, Polkadot also has a block fullness target. Fees increase or decrease for the next block based on the fullness of the current block relative to the target. The per-weight fee can change up to 30% in a 24 hour period. This rate captures long-term trends in demand, but not short-term spikes. To consider short-term spikes, Polkadot uses tips on top of the length and weight fees. Users can optionally add a tip to the fee to give the transaction a higher priority.

Polkadot fees consists of three parts:

  1. Base fee: a fixed fee that is applied to every transaction and set by the runtime.

  2. Length fee: a fee that gets multiplied by the length of the transaction, in bytes.

  3. Weight fee: a fee for each, varying runtime function. Runtime implementers need to implement a conversion mechanism which determines the corresponding currency amount for the calculated weight.

The final fee can be summarized as:

fee = base_fee + length_of_transaction_in_bytes * length_fee + weight_fee

For example, the Polkadot Runtime defines the following values:

Base fee: 100 uDOTs

Length fee: Length fee: 0.1 uDOTs

So, the weight to fee conversion is calculated as follows:

weight_fee = weight * (100 uDots / (10 * 10’000))

A weight of 10’000 (the smallest non-zero weight) is mapped to 1/10 of 100 uDOT. This fee will never exceed the max size of an unsigned 128 bit integer.

Polkadot can add a additional fee to transactions if the network becomes too busy and starts to decelerate the system. This fee can create an incentive to avoid the production of low priority or insignificant transactions. In contrast, those additional fees will decrease if the network calms down and can execute transactions without much difficulties.

This additional fee is known as the Fee Multiplier and its value is defined by the Polkadot runtime. The multiplier works by comparing the saturation of blocks; if the previous block is less saturated than the current block (implying an uptrend), the fee is slightly increased. Similarly, if the previous block is more saturated than the current block (implying a downtrend), the fee is slightly decreased.

The final fee is calculated as:

final_fee = fee * fee_multiplier
// Estimate the fees as RuntimeDispatchInfo using the signer
const info = await api.tx.balances.transfer(recipient, 123).paymentInfo(sender);

// Log relevant info, partialFee is Balance, estimated for current
console.log(`
  class=${info.class.toString()},
  weight=${info.weight.toString()},
  partialFee=${info.partialFee.toHuman()}
`);

The transactions that take place within Polkadot's shards - parachains and parathreads - do not incur Relay Chain transaction fees. Users of shard applications do not even need to hold DOT tokens, as each shard has its own economic model and may or may not have a token. There are, however, situations where shards themselves make transactions on the Relay Chain.

Transaction weight must be computable prior to execution, and therefore can only represent fixed logic. Some transactions warrant limiting resources with other strategies. For example:

  • Bonds: Some transactions, like voting, may require a bond that will be returned or slashed after an on-chain event. In the voting example, returned at the end of the election or slashed if the voter tried anything malicious.

  • Burns: A transaction may burn funds internally based on its logic. For example, a transaction may burn funds from the sender if it creates new storage entries, thus increasing the state size.

This page only covered transactions that come from normal users. If you look at blocks in a block explorer, though, you may see some "extrinsics" that look different from these transactions. In Polkadot (and any chain built on Substrate), an extrinsic is a piece of information that comes from outside the chain. Extrinsics fall into three categories:

  • Signed transactions

  • Unsigned transactions

  • Inherents

This page only covered signed transactions, which is the way that most users will interact with Polkadot . Signed transactions come from an account that has funds, and therefore Polkadot can charge a transaction fee as a way to prevent spam.

Finally, inherents are pieces of information that are not signed or included in the transaction queue. As such, only the block author can add inherents to a block. Inherents are assumed to be "true" simply because a sufficiently large number of validators have agreed on them being reasonable. For example, Polkadot blocks include a timestamp inherent. There is no way to prove that a timestamp is true the way one proves the desire to send funds with a signature. Rather, validators accept or reject the block based on how reasonable they find the timestamp. In Polkadot, it must be within some acceptable range of their own system clocks.

The runtime as part of the fee calculation.

To learn more about the motivation of a weight fee, check out this on weights.

The inclusion fee is deducted from the sender's account before transaction execution. A portion of the fee will go to the block author, and the remainder will go to the . This is 20% and 80%, respectively.

- from the identity pallet, allows users to request judgement from a specific registrar

- from the staking Pallet, is invoked by a single account in order to payout the reward for all nominators who back a particular validator

- from the balances module, is designed to move the specified balance by the sender to the receiver

- from the staking module, is designed to move any unlocked funds from the staking management system to be ready for transfer

Block Limits and Transaction Priority

Fees

Fee Multiplier

The Update Multiplier defines how the multiplier can change. Each runtime has the ability to define this behavior accordingly. For example, the Polkadot runtime internally updates the multiplier after each block according to a custom formula defined .

Calcuating Fees with Polkadot-JS

One useful utility for estimating transaction fees programmatically is the via the . Check out the following script that logs some relevant fee information:

For additional information on interacting with the API, checkout .

Shard Transactions

have a dedicated slot on the Relay Chain for execution, so their collators do not need to own DOT in order to include blocks. The parachain will make some transactions itself, for example, opening or closing an channel, participating in an to renew its slot, or upgrading its runtime. Parachains have their own accounts on the Relay Chain and will need to use those funds to issue transactions on the parachain's behalf.

will also make all the same transactions that a parachain might. In addition, the collators need to participate in an auction every block to progress their chain. The collators will need to have DOT to participate in these auctions.

Other Resource Limitation Strategies

Deposits: Some transactions, like setting an or claiming an index, use storage space indefinitely. These require a deposit that will be returned if the user decides to free storage (e.g. clear their IDE).

Limits: Some limits are part of the protocol. For example, nominators can only nominate 16 validators. This limits the complexity of .

Advanced

Unsigned transactions are for special cases where a user needs to submit an extrinsic from a key pair that does not control funds. For example, when users after genesis, their DOT address doesn't have any funds yet, so that uses an unsigned transaction. Validators also submit unsigned transactions in the form of "heartbeat" messages to indicate that they are online. These heartbeats must be signed by one of the validator's . Session keys never control funds. Unsigned transactions are only used in special cases because, since Polkadot cannot charge a fee for them, each one needs its own, custom validation logic.

Learn More

Web3 Foundation Research
​
block ratio
weight
extrinsics
converts weight units to balance units
Substrate doc
Treasury
request_judgement
payout_stakers
transfer
withdraw_unbounded
​
​
​
here
​
@polkadot/api
Polkadot-JS
​
Parachains
XCM
auction
Parathreads
​
identity
Phragmén
​
claim their DOT tokens
session keys
​
Web3 Foundation Research
Substrate Extrinsics, Weights & Fees