Arc Testnet is upgrading to v0.7.2. This release activates on Testnet on June 18, 2026 at 5:00 AM PT, bringing new features to the network. Please upgrade your testnet nodes before activation to avoid desyncing. Release notes:

Formicarium Testnet Sunset The Formicarium Testnet has reached its end of life and will be sunset on June 16. If you are currently using (Chain ID: 43521), please take note of this date. Formicarium has served its purpose. The MemeCore Mainnet is where the colony continues to grow.

Pharos Testnet went live over a year ago Since then: • 4.5B+ transactions processed • 59M+ blocks produced • 219M+ addresses created • 9.9M peak daily active addresses witnessed Across two phases — Legacy and Atlantic Ocean — Pharos Testnet continued executing at scale, accumulating persistent network activity, long-term execution history, and large-scale participation Thanks to everyone who has been running alongside the network 🌊🌊🌊

MyShell Testnet ◤Phase 01◢ is Live!#MyShellTestnet# Join the revolution and (open, AI) with me @myshell_ai:

👏 Unibase x B20 Testnet is live on-chain. Unibase has deployed a B20 test token on @base Sepolia, marking an early step toward a Base-native agent launchpad powered by the B20 token standard. What happened on-chain 👇 ✅ Network: Base Sepolia ✅ Standard: B20 Token Asset ✅ Token: Unibase B20 ✅ Contract: 0xb200000000000000000000ce1dda53f0fb54e7d9 We have also verified the full flow on Base Sepolia with real B20 precompiles and real Uniswap V4: Create → Curve Trading → Graduation → LP NFT Minted → Open Market Trading Testnet verified. Mainnet soon. 👀💙 📌 Verify on BaseScan: