{"id":15639,"date":"2025-01-02T08:00:00","date_gmt":"2025-01-02T08:00:00","guid":{"rendered":"https:\/\/hederav2stg.wpenginepowered.com\/blog\/leveraging-hederas-architecture-sirios-oracle-free-price-feed-approach\/"},"modified":"2026-02-03T19:08:12","modified_gmt":"2026-02-04T00:08:12","slug":"leveraging-hederas-architecture-sirios-oracle-free-price-feed-approach","status":"publish","type":"post","link":"https:\/\/hedera.com\/blog\/leveraging-hederas-architecture-sirios-oracle-free-price-feed-approach\/","title":{"rendered":"Leveraging Hedera\u2019s Architecture: Sirio\u2019s Oracle-Free Price Feed Approach"},"content":{"rendered":"<div class=\"body-text BodyCopy mb-40 style-1\">\n<p dir=\"ltr\"><strong>Decentralized Finance (DeFi)<\/strong> is one of the fastest-growing sectors in the <strong>Web3 ecosystem<\/strong>, reshaping how we define financial systems. At the heart of its success are critical tools like <strong>oracles<\/strong>\u2014data providers that bring <strong>real-world, off-chain information on-chain<\/strong> to be used in <strong>smart contracts<\/strong>. Oracles integrally power the creation of various <strong>decentralized applications (dApps)<\/strong>. However, oracles have only become available on the <strong>Hedera network<\/strong> as of <strong>Q3 of 2024<\/strong>.<\/p>\n<p><strong>Oracles<\/strong> are crucial to <strong><a href=\"https:\/\/www.sirio.finance\" target=\"_blank\">Sirio Finance<\/a><\/strong>, a <strong>lending and borrowing protocol<\/strong> built on Hedera. To proceed with developing our protocol without access to oracles, we developed an <strong>alternative, oracle-free and fully on-chain mechanism<\/strong>, designed to fetch information that\u2019s typically only provided by oracles. This allowed us to construct and test our application without oracle integrations, leading us to create a <strong>proprietary method<\/strong> that we will henceforth implement in our active platform as a <strong>backup to the oracle solution<\/strong> to enhance our protocol\u2019s security.<\/p>\n<p>This article will explore our strategy to <strong>bypass oracles<\/strong> in order to fetch token prices, which could previously only be done through oracles. The development of this method was only possible due to <strong>Hedera\u2019s unique architecture<\/strong>. Let\u2019s dig in!<\/p>\n<h4 class=\"color-ultraviolet\"><strong>How Do Oracles and Smart Contracts Work Together?<\/strong><\/h4>\n<p>By design, <strong>smart contracts<\/strong> are isolated programs that are deployed to a network but that cannot access or verify data outside their native network. This limitation is where <strong>oracles<\/strong> come into play, serving as a <strong>bridge<\/strong> that connects smart contracts with data from the external world. They are <strong>decentralized entities<\/strong> that gather data from multiple sources and feed it to the smart contracts to be used for <strong>on-chain activities<\/strong>. The integration of oracles into smart contracts involves the following key steps:<\/p>\n<ul>\n<li><strong>Data Request<\/strong>: The smart contract generates a request for data; for example, the current price of a cryptocurrency, weather conditions, or any other real-world information.<\/li>\n<li><strong>Oracle Query<\/strong>: The request is then sent to an oracle or a network of oracles.<\/li>\n<li><strong>Data Verification<\/strong>: Once the data is retrieved, it undergoes a verification process.<\/li>\n<li><strong>Data Delivery<\/strong>: Next, the verified data is fed back to the smart contract.<\/li>\n<li><strong>Execution<\/strong>: With the necessary data as input, the smart contract automatically executes the predefined logic.<\/li>\n<\/ul>\n<p>The following diagram explains how <strong>oracles and smart contracts<\/strong> work together:<\/p>\n<figure><\/figure>\n<h4 class=\"color-ultraviolet\"><strong><br \/><\/strong><\/h4>\n<h4 class=\"color-ultraviolet\"><strong>On-Chain Price Feeds System<\/strong><\/h4>\n<p>When <strong>Sirio<\/strong> started developing its protocol, <strong>oracles<\/strong> were not yet available on the <strong>Hedera network<\/strong>, which prevented the ability to query token prices. Since this is an integral part of our protocol, we developed an <strong>alternative system<\/strong> that bypasses the need for oracles to obtain the price of tokens at market value. The mechanism is structured in three steps:<\/p>\n<ol>\n<li><strong>Get the current price of the given token in HBAR.<\/strong><\/li>\n<li><strong>Calculate the mean of the historical price<\/strong> over a specific interval and frequency; this mechanism is also defined as <strong><a href=\"https:\/\/www.rareskills.io\/post\/twap-uniswap-v2\" target=\"_blank\">TWAP (Time Weighted Average Price)<\/a><\/strong>.<\/li>\n<li><strong>Convert the price of the token from HBAR to USD.<\/strong><\/li>\n<\/ol>\n<p>Using this mechanism, we could accurately implement <strong>token prices at market value<\/strong> within our protocol, allowing users to <strong>lend and borrow their assets<\/strong>. Let\u2019s dive into the details!<\/p>\n<h4 class=\"color-ultraviolet\"><strong>1. Token-HBAR Price<\/strong><\/h4>\n<p>The first step necessary to define the token\u2019s market price is to extract its value from the <strong>liquidity pools (LPs)<\/strong> in which it\u2019s paired. As seen in the <a href=\"https:\/\/www.saucerswap.finance\/liquidity\" target=\"_blank\">analytics section on <\/a><strong><a href=\"https:\/\/www.saucerswap.finance\/liquidity\" target=\"_blank\">SaucerSwap<\/a><\/strong>, the LPs with the most liquidity have an <strong>HBAR pair<\/strong>. To explain how we defined the price in <strong>HBAR<\/strong> of each token, refer to <strong>SaucerSwap\u2019s market-making architecture<\/strong>, which uses the constant product function defined as follows:<br \/><em><be><\/be><\/em><\/p>\n<\/p>\n<\/p>\n<p><center><em><strong>X * Y = K<\/strong><\/em><\/center><\/p>\n<\/p>\n<\/p>\n<p>Where:<\/p>\n<ul>\n<li><strong>X<\/strong> = Quantity of Asset X<\/li>\n<li><strong>Y<\/strong> = Quantity Asset Y<\/li>\n<li><strong>K<\/strong> = Constant (<strong>Quantity of Asset X * Quantity of Asset Y<\/strong>)<\/li>\n<\/ul>\n<p>The price of tokens in a <strong>SaucerSwap LP<\/strong> is determined by the ratio of the quantities of the two tokens in the pool. If you have a pool with <strong>Token A and Token B<\/strong>, the price of <strong>Token A in terms of Token B<\/strong> is calculated by dividing the quantity of Token B by the quantity of Token A, and vice versa.<\/p>\n<figure><\/figure>\n<p>Our <strong>smart contracts<\/strong> implement logic that first retrieves the latest <strong>Token\/HBAR exchange rate<\/strong> for each token. Next, they convert the amount of <strong>HBARs<\/strong> needed to purchase one unit of the token into a time-weighted value using the <strong>TWAP system<\/strong>.<\/p>\n<h4 class=\"color-ultraviolet\"><strong>2. TWAP System<\/strong><\/h4>\n<p><strong>TWAP<\/strong>, or <strong>Time-Weighted Average Price<\/strong>, calculates the <strong>average price<\/strong> of an asset (e.g., a token) over a specific <strong>time period<\/strong>. This method ensures a more <strong>stable<\/strong> and <strong>reliable price estimate<\/strong> by considering multiple <strong>price points<\/strong> within the duration, rather than relying on a single snapshot.<\/p>\n<p>One of the key advantages of <strong>TWAP<\/strong> is its effectiveness in <strong>reducing the risk of price manipulation<\/strong> by large traders, often referred to as <strong>&#8220;whales.&#8221;<\/strong> By averaging prices over a specified timeframe, <strong>TWAP<\/strong> minimizes the impact of <strong>short-term price spikes or drops<\/strong> caused by large trades or market volatility.<\/p>\n<p>For example, instead of using a single price point that could be artificially influenced, <strong>TWAP<\/strong> calculates an <strong>average<\/strong> using <strong>price data captured at regular intervals<\/strong> (e.g., hourly over 24 hours). This provides a more <strong>accurate price feed<\/strong>, which is essential for protocols managing <strong>lending, borrowing, and liquidation processes<\/strong>.<\/p>\n<p><strong>TWAP<\/strong> is calculated using the formula:<em><\/em><\/p>\n<\/p>\n<\/p>\n<p><center><em><strong>Token Price = (P1 \u00d7 T1 + P2 \u00d7 T2 + &#8230; + Pn \u00d7 Tn) \/ (T1 + T2 + &#8230; + Tn)<\/strong><\/em><\/center><\/p>\n<\/p>\n<\/p>\n<p>Where:<\/p>\n<ul>\n<li><strong>P1\u200b, P2\u200b, \u2026, P24\u200b<\/strong> represent the <strong>token prices<\/strong> captured at <strong>regular intervals<\/strong> (e.g., every hour over 24 hours).<\/li>\n<li><strong>T1, T2, \u2026, T24\u200b<\/strong> represent the <strong>time intervals<\/strong> corresponding to each <strong>price observation<\/strong>.<\/li>\n<\/ul>\n<p>Using this formula, we calculate the <strong>Time-Weighted Average Price (TWAP)<\/strong> for all our assets. This approach considers the <strong>prices (P)<\/strong> and <strong>time intervals (T)<\/strong> over the past 24 hours, with <strong>data points captured every 1 hour<\/strong>.<\/p>\n<h4 class=\"color-ultraviolet\"><strong>3. HBAR\/USD Conversion<\/strong><\/h4>\n<ol><\/ol>\n<p>After calculating the <strong>time-weighted amount of HBAR<\/strong> required to purchase one unit of each token, we convert it into its <strong>dollar equivalent<\/strong> using the <strong>HIP-475 System Contract<\/strong>. <strong>HIPs<\/strong> are pre-compiled contracts designed to streamline interactions with <strong>Hedera<\/strong> through the <strong>Solidity programming language<\/strong>. <strong>HIP-475<\/strong> specifically uses <strong><a href=\"https:\/\/hedera.com\/blog\/how-hedera-calculates-the-hbar-usd-exchange-rate-for-sdks-and-applications\" target=\"_blank\">Hedera&#8217;s Exchange Rate Tool<\/a> (ERT)<\/strong> to determine the <strong>HBAR\/USD exchange rate<\/strong>.<\/p>\n<p>For each token, we call a <strong>HIP-475 function<\/strong> that takes an <strong>HBAR quantity<\/strong> as input and returns the corresponding value in <strong>USD<\/strong>.<\/p>\n<p>We use the following <strong>function<\/strong> to make the conversion:<\/p>\n<\/div>\n<div class=\"hedera-code-window\" style=\"background-image:url('https:\/\/hedera.com\/wp-content\/uploads\/2025\/12\/CodeSnippetBackground-scaled.jpg');padding:24px;border-radius:8px;margin:24px 0;\">\n<p>  <!-- Hidden image so WP All Import downloads this background image into Media Library --><br \/>\n  <img decoding=\"async\" src=\"https:\/\/hedera.com\/wp-content\/uploads\/2025\/12\/CodeSnippetBackground-scaled.jpg\" alt=\"code window background\" style=\"display:none;\" \/><\/p>\n<div class=\"code-window-header\">\n<div class=\"code-window-title\"><\/div>\n<div class=\"code-window-body\"><\/div>\n<\/p><\/div>\n<pre><code class=\"language-javascript\">interface IExchangeRate {\nfunction tinybarsToTinycents(uint256 tinybars) external returns (uint256);\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"body-text BodyCopy mb-40 style-1\">\n<p><strong>The function&#8217;s output<\/strong> is the <strong>Token\/USD Exchange Rate<\/strong>, ready to be used in our <strong>smart contracts<\/strong>. We can resume the three steps mentioned above in the following <strong>diagram flow<\/strong>:<\/p>\n<figure \"droid=\"\" \"fira=\"\" \"helvetica=\"\" -webkit-text-stroke-width:=\"\" 0px;=\"\" 16px;=\"\" 400;=\"\" auto;=\"\" cantarell,=\"\" font-size:=\"\" font-style:=\"\" font-variant-caps:=\"\" font-weight:=\"\" letter-spacing:=\"\" neue\",=\"\" none;=\"\" none;\"=\"\" normal;=\"\" orphans:=\"\" oxygen,=\"\" roboto,=\"\" sans\",=\"\" sans-serif;=\"\" segoe=\"\" start;=\"\" style=\"border: 0px solid rgb(229, 231, 235); box-sizing: inherit; --tw-border-spacing-x: 0; --tw-border-spacing-y: 0; --tw-translate-x: 0; --tw-translate-y: 0; --tw-rotate: 0; --tw-skew-x: 0; --tw-skew-y: 0; --tw-scale-x: 1; --tw-scale-y: 1; --tw-pan-x: ; --tw-pan-y: ; --tw-pinch-zoom: ; --tw-scroll-snap-strictness: proximity; --tw-ordinal: ; --tw-slashed-zero: ; --tw-numeric-figure: ; --tw-numeric-spacing: ; --tw-numeric-fraction: ; --tw-ring-inset: ; --tw-ring-offset-width: 0px; --tw-ring-offset-color: #fff; --tw-ring-color: rgba(59,130,246,0.5); --tw-ring-offset-shadow: 0 0 #0000; --tw-ring-shadow: 0 0 #0000; --tw-shadow: 0 0 #0000; --tw-shadow-colored: 0 0 #0000; --tw-blur: ; --tw-brightness: ; --tw-contrast: ; --tw-grayscale: ; --tw-hue-rotate: ; --tw-invert: ; --tw-saturate: ; --tw-sepia: ; --tw-drop-shadow: ; --tw-backdrop-blur: ; --tw-backdrop-brightness: ; --tw-backdrop-contrast: ; --tw-backdrop-grayscale: ; --tw-backdrop-hue-rotate: ; --tw-backdrop-invert: ; --tw-backdrop-opacity: ; --tw-backdrop-saturate: ; --tw-backdrop-sepia: ; margin: 0px 0px 1em; outline: currentcolor !important; position: relative; padding: 0px; clear: both; caret-color: rgb(63, 77, 90); color: rgb(63, 77, 90); font-family: system-ui, BlinkMacSystemFont, -apple-system, \" text-align:=\"\" text-decoration:=\"\" text-indent:=\"\" text-transform:=\"\" ubuntu,=\"\" ui\",=\"\" white-space:=\"\" widows:=\"\" word-spacing:=\"\"><strong><\/strong><\/figure>\n<p dir=\"ltr\">This approach ensures that <strong>token prices<\/strong> are accurately determined in a <strong>secure<\/strong> and <strong>decentralized manner<\/strong>, forming a reliable foundation for our protocol\u2019s <strong>lending and borrowing functionalities<\/strong>.<\/p>\n<h4 class=\"color-ultraviolet\"><strong><strong>Conclusion<\/strong><\/strong><\/h4>\n<p>The journey to building a <strong>decentralized<\/strong> and <strong>secure lending and borrowing protocol<\/strong> on <strong>Hedera<\/strong> has been both <strong>innovative<\/strong> and <strong>adaptive<\/strong>. Faced with the absence of <strong>oracles<\/strong> during the initial stages of development, <strong>Sirio Finance<\/strong>engineered an <strong>oracle-free<\/strong>, fully <strong>on-chain solution<\/strong> that reliably calculates <strong>token prices<\/strong> using <strong>TWAP<\/strong> and <strong>Hedera\u2019s unique architecture<\/strong>. This system not only enabled the protocol&#8217;s <strong>development and testing<\/strong> but also now serves as a <strong>robust backup mechanism<\/strong> to complement <strong>Hedera&#8217;s newly available oracle integrations<\/strong>.<\/p>\n<p>By combining <strong>oracle solutions<\/strong> with our <strong>proprietary price-fetching mechanism<\/strong>, <strong>Sirio Finance<\/strong> ensures enhanced <strong>reliability<\/strong>, <strong>resilience<\/strong>, and <strong>security<\/strong> for its users. This <strong>dual-layered approach<\/strong> underscores our commitment to leveraging <strong>Hedera&#8217;s cutting-edge features<\/strong> while continuously optimizing our protocol to provide a <strong>seamless DeFi experience<\/strong>. With these innovations, we are proud to set new standards for <strong>transparency<\/strong> and <strong>robustness<\/strong> in <strong>DeFi finance<\/strong>.<\/p>\n<h4 class=\"color-ultraviolet\"><strong>About Sirio<\/strong><\/h4>\n<p><strong><a href=\"https:\/\/www.sirio.finance\" target=\"_blank\">Sirio Finance<\/a><\/strong> is a <strong>pioneering lending and borrowing protocol<\/strong> that leverages <strong>AI<\/strong> to revolutionize <strong>risk management<\/strong>. At its core, the team is developing an <strong>advanced machine-learning algorithm<\/strong> to mitigate <strong>liquidation events<\/strong> seamlessly and <strong>permissionlessly<\/strong>.<\/p>\n<p>With a strong focus on <strong>user experience<\/strong> and <strong>cutting-edge risk management<\/strong>, <strong>Sirio&#8217;s proprietary machine-learning model<\/strong> sets a new standard in the industry. The protocol&#8217;s vision extends to <strong>decentralizing<\/strong> and <strong>open-sourcing<\/strong> this technology, reinforcing its commitment to advancing <strong>decentralized AI solutions<\/strong>.<\/p>\n<p>This <strong>forward-thinking approach<\/strong> has fostered<strong> key partnerships <\/strong>across the ecosystem, including collaborations with<strong> <a href=\"https:\/\/filecoin.io\/\">Filecoin<\/a>, <a href=\"https:\/\/hbarsuite.app\/#\/dashboard\">HbarSuite<\/a>, <a href=\"https:\/\/www.hashpack.app\/\">HashPack<\/a>, <a href=\"https:\/\/www.saucerswap.finance\/\">SaucerSwap<\/a> <\/strong>and <strong><a href=\"https:\/\/kabila-website.webflow.io\/\">Kabila<\/a>.<\/strong> Sirio&#8217;s innovation has also earned recognition through a <strong>grant from <a href=\"https:\/\/www.hbarfoundation.org\/\">The HBAR Foundation<\/a><\/strong>, solidifying its position as a leader in the <strong>decentralized finance space<\/strong>.<\/p>\n<p><strong>Sirio aims to launch on mainnet by the beginning of 2025.<\/strong> Before we go live, we invite you to become familiar with our <a href=\"http:\/\/testnet.sirio.finance\" target=\"_blank\"><strong>Testnet version<\/strong>.<\/a><\/p>\n<p>To get involved in the <strong>Sirio community<\/strong> and stay in the loop on incoming opportunities, we invite you to <strong>join our Discord Server<\/strong> or <strong><a href=\"https:\/\/x.com\/SirioFinance\" target=\"_blank\">follow us on X<\/a><\/strong>; you can also check more <strong><a href=\"https:\/\/www.sirio.finance\" target=\"_blank\">resources from Sirio<\/a><\/strong> (<strong>testnet<\/strong>, <strong>website<\/strong>, <strong>Medium<\/strong>, <strong>social media<\/strong>, etc.).<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>By leveraging Hedera&#8217;s architecture, Sirio integrates TWAP (Time-Weighted Average Price) calculations and HBAR\/USD conversions, ensuring secure, resilient price feeds. This oracle-free method not only enabled seamless development but now enhances the protocol&#8217;s security as a backup to traditional oracles.<\/p>\n","protected":false},"author":10,"featured_media":16719,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[1],"tags":[47,45],"ppma_author":[43],"class_list":["post-15639","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-defi","tag-technical"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Leveraging Hedera\u2019s Architecture: Sirio\u2019s Oracle-Free Price Feed Approach | Hedera<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hedera.com\/blog\/leveraging-hederas-architecture-sirios-oracle-free-price-feed-approach\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Leveraging Hedera\u2019s Architecture: Sirio\u2019s Oracle-Free Price Feed Approach | Hedera\" \/>\n<meta property=\"og:description\" content=\"By leveraging Hedera&#039;s architecture, Sirio integrates TWAP (Time-Weighted Average Price) calculations and HBAR\/USD conversions, ensuring secure, resilient price feeds. 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