Terms of Service Tools & APIs / TOOLs Chainhook New Re-org aware indexing engine for Bitcoin layers. hiro platform Chainhooks / APIs Stacks Blockchain API Token Metadata API Pricing Ordhook New A client indexer for Ordinals. Build Hiro Docs Set up Hiro tools. Guides Hiro Platform beta Write and deploy smart contracts from your browser. Resources / HIRO BOOKS A Developer's Guide to Bitcoin DeFi A Developer’s Guide to Bitcoin Ordinals A Comprehensive Guide to Web3 App Development FEATURED A Beginner's Guide to Bitcoin Layers Read the free guide videos newsletter Company Careers We're hiring! / ROLE About Press Blog Docs ↗Sign in Twitter Discord Github Youtube General Terms of Service APIs Terms of Service Terms of Service LAST REVISED ON: April 8, 2025 These Terms of Use (the “Agreement”) set forth the legally binding terms and conditions by which you, whether personally or on behalf of an entity (“you” or “your”) may access and use the content, functionality, features and products (the “Products”) provided by Hiro Systems PBC (referred to herein as “Hiro”, “we”, “our”, or “us”) available on or through, exclusively or non-exclusively, hiro.so and any other website, web application or mobile application operated by Hiro. The Products include but shall not necessarily be limited to the platform.hiro.so, a hosted blockchain infrastructure platform (the “Platform”) and the application programming interfaces (the “APIs”). You must read this Agreement carefully as it governs your use of the Products. By accessing or using any of the Products, you signify that you have read, understand, and agree to be bound by this Agreement in its entirety. If you do not agree, you are not authorized to access or use any of our Products and should not use our Products. To access or use any of our Products, you must be able to form a legally binding contract with us. Accordingly, you represent that you are at least the age of majority in your jurisdiction (e.g., 18 years old in the United States) and have the full right, power, and authority to enter into and comply with the terms and conditions of this Agreement on behalf of yourself and any company or legal entity for which you may access or use the Interface.  If you are entering into this Agreement on behalf of an entity, you represent to us that you have the legal authority to bind such entity. You may access our Products free of charge or upgrade to our paid Products ordered through our online purchasing portal or an order form (“Purchased Products”). NOTICE: This Agreement contains important information, including a binding arbitration provision and a class action waiver, both of which impact your rights as to how disputes are resolved. Our Products are only available to you — and you should only access any of our Products — if you agree completely with these terms. 1. Our Products 1.1 Platform The Platform is a hosted application that allows you to create, test and deploy smart contracts onto the Stacks blockchain. 1.2 APIs We offer several APIs that provide that provide real-time data about the Stacks and Bitcoin blockchains. Hiro may provide an API key from time to time to developers. When using the API key,you must restrict use to server-side applications. You agree not to expose, share the API key, or use the API key in a client-side application (e.g., frontend or browser-basedapplications). If Hiro assigns you developer credentials (e.g.client IDs), you must use them with the applicable APIs. You will not misrepresent or mask either your identity or your API client's identity when using the APIs. 1.3 API Rates and SLA You will only access (or attempt to access) an API by the means and at the rate limits described in your relevant plans Hiro API Terms and Pricing Tiers. Hiro will provide the SLAs and support in accordance with the applicable plan. 1.4 Other Products We may from time to time in the future offer additional products, and such additional products shall be considered a Product as used herein, regardless of whether such product is specifically defined in this Agreement. 1.5 Third Party Services and Content When you use any of our Products, you may also be using the products, services, links, or content of one or more third parties.  Your use of such third party products, services or content (collectively, “Third Party Links”) may be subject to separate policies, terms of use and fees of these third parties, and you agree to abide by and be responsible for such policies, terms of use and fees, as applicable. Hiro does not review, approve, monitor, endorse, warrant, or make any representations with respect to Third-Party Links. You use all Third-Party Links at your own risk, and to the fullest extent permitted by law, Hiro shall have no liability to you for Third Party Links. 1.6 Blockchain Protocols Hiro does not control or operate any version of a blockchain (a “Protocol”) that its products may interface with, including the Stacks or Bitcoin networks. By using the Products, you understand that you are not buying or selling digital assets from us and we have no control over any smart contracts. 2. Modifications of this Agreement or our Products 2.1 Modifications of this Agreement We reserve the right, in our sole discretion, to modify this Agreement from time to time. If we make any material modifications, we will provide notice of such changes by updating the “Last Updated” date at the beginning of this Agreement. All modifications will be effective when they are posted, and your continued accessing or use of any of the Products will serve as confirmation of your acceptance of those modifications. It is your sole responsibility to review the Agreement from time to time to view such changes and to ensure that you understand the terms and conditions that apply when you access or use the Products. If you do not agree with any modifications to this Agreement, you must immediately stop accessing and using all of our Products. 2.2 Modifications of our Products We reserve the following rights, which do not constitute obligations of ours: (a) with or without notice to you, to modify, substitute, eliminate or add to any of the Products; (b) to review, modify, filter, disable, delete and remove any and all content and information from any of the Products. 2.3 Beta Products From time to time, Hiro may offer product identified as beta, pilot, developer preview, non-production, evaluation or by a description of similar import (“Beta Products”). You may accept or decline Beta Product. If accepted by you, Beta Products: (a) are provided only for evaluation purposes; (b) may not be relied on for production use; (c) may not be supported; and (d) may be subject to additional terms. Unless otherwise stated, any Beta Products trial period will expire on the date that a version of the Beta Products becomes generally available or is discontinued. Hiro may discontinue Beta Products at any time in its sole discretion and may never make Beta Products generally available. 3. Accounts To access the Platform, you must register for an account (“Account”). You are responsible for maintaining the confidentiality of your Account login information and are fully responsible for all activities that occur under your Account. You agree to immediately notify Hiro of any unauthorized use, or suspected unauthorized use of your Account or any other breach of security. We will not be liable for any loss or damage arising from your failure to comply with this Agreement. 4. Fees 4.1 Fees From time to time, you may decide to upgrade to Purchased Products. In consideration for the provision oft he Purchased Products to you, you shall pay Hiro the subscription fees applicable to such access and use set forth on the Hiro website or in the applicable order form(s) (“Fees”).You are not entitled to any refund of fees paid or relief from fees due if the volume of the Purchased Products you actually use is less than the volume ordered, and you may not carry over any of the unused volume to the next term. 4.2 Payment You will provide Hiro or its service providers with valid and updated credit card or ACH information. You authorize Hiro to charge such credit card for all Purchased Products listed in the order form for the initial subscription term and any renewal subscription term(s). Unless otherwise stated, invoiced fees are due net 30 days from the invoice date. You are responsible for providing complete and accurate billing and contact information to Hiro and notifying Hiro of any changes to such information. Payment obligations for use of the Purchased Products are non-cancelable andFees paid are non-refundable. 4.3 Taxes All Fees are exclusive of all taxes, levies or duties, and you will be responsible for payment of such taxes, levies or duties resulting from its use of the Purchased Products, excluding only federal and state taxes based solely upon Hiro’s net income. If Hiro has the legal obligation to pay or collect taxes for which you are responsible pursuant to this Section 4.3, unless you provide Hiro with a valid tax exemption certificate authorized by the appropriate taxing authority, Hiro will invoice the amount of such taxes to you, and you shall pay such amount. 4.4 Suspension If any charge owed by you under this or any other agreement for services is 30 days or more overdue, Hiro may, without limiting its other rights and remedies, accelerate your unpaid fee obligations under such agreements so that all such obligations become immediately due and payable, and suspend Products until such amounts are paid in full, provided that, Hiro will endeavor to give you prior notice before suspending services to you. 5. Intellectual Property Rights 5.1 IP Rights Generally You acknowledge that all the intellectual property rights, including copyrights, patents, trademarks, and trade secrets, in each of our Products are owned by Hiro or Hiro’s suppliers. ‍ Except solely with respect to open source software Hiro makes available (“Open Source Software”), we grant you a limited, revocable, non-exclusive, non-sublicensable, non-transferable license to access and use our Products solely in accordance with this Agreement. You agree that you will not use, modify, distribute, tamper with, reverse engineer, disassemble or decompile any of our Products for any purpose other than as expressly permitted pursuant to this Agreement. Except as set forth in this Agreement, we grant you no rights to any of our Products, including any intellectual property rights. ‍ The Products may include or incorporate Open Source Software, and your use of such Open Source Software is subject to and governed by the applicable license accompanying, linked to or embedded in such Open Source Software (each an “Open Source License”). Hiro grants you a license to use the Open Source Software to the full extent permitted by the applicable Open Source License. ‍ By using any of our Products, you grant us a worldwide, non-exclusive, sublicensable, royalty-free license to use, copy, modify, and display any content, including but not limited to text, materials, images, files, communications, comments, feedback, suggestions, ideas, concepts, questions, data, or otherwise, that you post on or through any of our Products for our current and future business purposes, including to provide, promote, and improve the services. 5.2 DMCA Complaints Hiro’s explorer sites may aggregate and display publicly available content from a Protocol. We have no control over any content, information or other materials contained within such Protocol. ‍ Nevertheless, despite our position as an aggregator, Hiro will process and investigate notices of alleged infringement and will take appropriate actions under the Digital Millennium Copyright Act ("DMCA”) and other applicable intellectual property laws with respect to any alleged or actua…