Key InformationThis page will be kept updated with key information about the transition.
- Chain ID: 11142220
- Status: testnet live
- Built on: Ethereum Sepolia L1
- Phases:
- Jul 23, 2025: Celo Sepolia launch ✅
- Jul 24, 2025—Jul 31, 2025: Internal testing ✅
- Aug 1, 2025—Aug 12, 2025: Early access phase ✅
- Aug 13, 2025: Public announcement ✅
- Aug 14, 2025—Sep 14, 2025: Transition period :round_pushpin:
- Sep 30, 2025: Planned Alfajores and Baklava sunset, aligned with Holesky deprecation
What is Celo Sepolia?
Celo Sepolia is the new developer testnet for Celo running as an Ethereum Layer 2 on Sepolia. It starts with a clean slate (no inherited state from Alfajores) and is designed for long-term use following Ethereum Sepolia’s testnet lifecycle.Call to Action
For Node Providers
Please support both Alfajores and Celo Sepolia in parallel during the early access and transition phases to ensure a smooth migration for developers. See the node setup guide for technical details and our recommended Docker Compose Setup. Release versions:For Developers
- Update applications to support chain ID 11142220.
- Redeploy contracts on Celo Sepolia.
- Get testnet CELO tokens from the faucets.
Key Characteristics and Resources
- Chain ID: 11142220
- L1 Foundation: Ethereum Sepolia
- EigenDA: v2 (Blazar)
- Contracts: see the L1 and L2 contracts in the specification
- RPC endpoint: Celo Sepolia Forno
- Block explorer: Blockscout
- Faucets:
- Bridge: Superbridge for Celo Sepolia
Key Differences from Alfajores
| Aspect | Alfajores | Celo Sepolia |
|---|---|---|
| L1 Foundation | Ethereum Holesky | Ethereum Sepolia |
| Chain ID | 44787 | 11142220 |
| State | Historical from L1 migration | Fresh start |
| Longevity | Sunset planned Sept 2025 | Long-term testnet |
Early Adopters
Thank you to the first wave of our ecosystem partners supporting Celo Sepolia already:- Google Cloud – Google Cloud Web3 Faucet
- Blockscout – Block Explorer
- EigenDA v2 – Data Availability
- Superbridge – Bridging Infrastructure
- Ankr – Node & RPC Provider
- AllThatNode by DSRV – Node & RPC Provider
- Redstone – Oracle Services
- Talent Protocol – Web3 Professional Network
- Prosperity Pass – Celo PG Onchain Access Pass