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This guide serves as a starting point for Exchanges and RPC Providers to understand F3 and leverage the new APIs for faster finality confirmations.

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Status

• 2025-09-19: updated to make /v2 discussion optional, and streamline to /v1 as default given additions in Lotus v1.34.0.
• 2025-07-22: added 📊 Monitoring F3 Performance and Participation
• 2025-07-22: Updated to discuss ways of staying entirely in /v1 with ‣.
• 2025-06-26: Feedback was incorporated from implementers. It’s now ready to receive feedback from the wider ecosystem.
• 2025-06-05: This document was created to help exchanges and RPC providers understand F3 and the new V2 APIs. It is currently a DRAFT.
• 2025-04-29: F3 was activated on Mainnet.

🌟 Introduction

This guide provides essential information for Exchanges and RPC Providers about F3 (Fast Finality) in the Filecoin network and how to leverage the new Lotus V2 APIs.

In this guide, we will:

1. Define 💭 What is F3 (Fast Finality)? and its purpose.
2. Explain 🏢 Benefits
3. Provide ⚙️ Practical Implementation Guide
4. Answer ❓ Frequently Asked Questions
5. Point to the future with Appendix: using /v2 APIs

💭 What is F3 (Fast Finality)?

F3 is a consensus mechanism in the Filecoin network that dramatically reduces transaction finalization times, providing significant benefits for exchanges and RPC providers.