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This guide serves as a starting point for Exchanges and RPC Providers to understand F3 and leverage the new V2 APIs for faster finality confirmations.

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Status

• 2025-07-22: added 📊 Monitoring F3 Performance and Participation
• 2025-07-22: Updated to discuss ways of staying entirely in /v1 with Alternative Pattern Using Only V1 APIs.
• 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 for V2 APIs
4. Answer ❓ Frequently Asked Questions

💭 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.

🏁 F3 reduces finality time from 7.5 hours (900 epochs) to just a couple of minutes. This transformation enables much faster deposit confirmations and withdrawal processing, dramatically improving user experience as users no longer need to wait hours for transaction certainty.