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x402
Olympia Upgrade — May 2026 Development Checkpoint
Ethereum Classic Core Developers
Multi-client stability achieved across all three Olympia execution clients.
ethereumclassic.com/build/clie...
🟢 Fukuii v0.5.0+ — Multi-EVM architecture implemented. Dual Ethereum Classic (PoW) and Ethereum (PoS) execution from a single client. ETH/68 + ETH/69 validated on ETC mainnet. fukuii.com
🟠 Core-Geth v1.13.0+ — Stable, peered, carrying Olympia support through transition Go 1.26+ and 2026 LTS dependencies from previous deprecated codebase.
🔵 Besu v26.5.0+ — Migrated to Besu's May 2026 release 26.5.0. ETH/68 + ETH/69+ PoW compat.
All three clients advertising Olympia as next hardfork on the wire as we prepare Mordor testnet for a post-olympia environment.
Clients are modernizing for the post-Olympia environment — hardening with critical security patches and performance improvements, delivering production-grade infrastructure for miners, mining pools, exchanges, infrastructure providers, institutions, and custody platforms.
With Olympia, ETC's core software returns to head-of-branch development following the 2024 maintenance period. In addition to CL client work, post-Olympia EL plugin roadmap is in active development — upstream ETC compatibility layers for Go-Ethereum, Nethermind, Erigon, Besu, and Reth.
Confirmation from Ethereum Classic core developers that Olympia activation is on track for ETC mainnet activation before 2027.
