> For the complete documentation index, see [llms.txt](https://docs.megaeth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.megaeth.com/spec/network-upgrades/overview.md). # Overview This section documents each MegaETH network upgrade, describing what changed, why, and what developers need to know. ## Hardfork History ### [MiniRex](/spec/network-upgrades/minirex.md) {% tabs %} {% tab title="Testnet" %} `0` (Genesis) {% endtab %} {% tab title="Mainnet" %} `0` (Genesis) {% endtab %} {% endtabs %} [Dual gas model](/spec/megaevm/dual-gas-model.md), [multidimensional resource limits](/spec/megaevm/resource-limits.md), [gas detention](/spec/megaevm/gas-detention.md), 98/100 gas forwarding, SELFDESTRUCT disabled, system contracts ([Oracle](/spec/system-contracts/oracle.md), [Timestamp](/spec/system-contracts/high-precision-timestamp.md)) ### MiniRex1 {% tabs %} {% tab title="Testnet" %} N/A {% endtab %} {% tab title="Mainnet" %} `1764845637` (Dec 4, 2025, 10:53 UTC) {% endtab %} {% endtabs %} Rollback: reverted to Equivalence spec (maps to `EQUIVALENCE`). The MiniRex features were deactivated on the network; no chain reorg or state rollback occurred. Contracts deployed during MiniRex remained on-chain. ### MiniRex2 {% tabs %} {% tab title="Testnet" %} N/A {% endtab %} {% tab title="Mainnet" %} `1764849932` (Dec 4, 2025, 12:05 UTC) {% endtab %} {% endtabs %} Restoration: re-activated MiniRex spec (maps to `MINI_REX`). All MiniRex features (dual gas model, resource limits, gas detention) were re-enabled. ### [Rex](/spec/network-upgrades/rex.md) {% tabs %} {% tab title="Testnet" %} `1764694618` (Dec 2, 2025, 16:56 UTC) {% endtab %} {% tab title="Mainnet" %} `1764851940` (Dec 4, 2025, 12:39 UTC) {% endtab %} {% endtabs %} Transaction intrinsic [storage gas](/spec/reference/glossary.md#storage-gas), revised storage gas economics (`base × (multiplier − 1)`), consistent CALL-like opcode behavior, [state growth](/spec/megaevm/resource-accounting.md#state-growth) tracking ### [Rex1](/spec/network-upgrades/rex1.md) {% tabs %} {% tab title="Testnet" %} `1766147599` (Dec 19, 2025, 12:33 UTC) {% endtab %} {% tab title="Mainnet" %} `1766282400` (Dec 21, 2025, 02:00 UTC) {% endtab %} {% endtabs %} Fix: [compute gas](/spec/reference/glossary.md#compute-gas) limit reset between transactions ### [Rex2](/spec/network-upgrades/rex2.md) {% tabs %} {% tab title="Testnet" %} `1770116400` (Feb 3, 2026, 11:00 UTC) {% endtab %} {% tab title="Mainnet" %} `1770246000` (Feb 4, 2026, 23:00 UTC) {% endtab %} {% endtabs %} SELFDESTRUCT re-enabled ([EIP-6780](https://eips.ethereum.org/EIPS/eip-6780)), [KeylessDeploy](/spec/system-contracts/keyless-deploy.md) system contract ### [Rex3](/spec/network-upgrades/rex3.md) {% tabs %} {% tab title="Testnet" %} `1771380000` (Feb 18, 2026, 02:00 UTC) {% endtab %} {% tab title="Mainnet" %} `1771639200` (Feb 21, 2026, 02:00 UTC) {% endtab %} {% endtabs %} [Oracle](/spec/system-contracts/oracle.md) gas cap raised to 20M, SLOAD-based oracle detention, keyless deploy compute gas tracking ### [Rex4](/spec/network-upgrades/rex4.md) {% tabs %} {% tab title="Testnet" %} `1776400000` (Apr 17, 2026, 04:26 UTC) {% endtab %} {% tab title="Mainnet" %} `1776659200` (Apr 20, 2026, 04:26 UTC) {% endtab %} {% endtabs %} Per-[call-frame](/spec/reference/glossary.md#call-frame) resource budgets, relative gas detention, [storage gas stipend](/spec/reference/glossary.md#storage-gas-stipend), MegaAccessControl, MegaLimitControl, sandbox environment inheritance. ### [Rex5](/spec/network-upgrades/rex5.md) {% tabs %} {% tab title="Testnet" %} `1780459200` (Jun 3, 2026, 04:00 UTC) {% endtab %} {% tab title="Mainnet" %} `1780632000` (Jun 5, 2026, 04:00 UTC) {% endtab %} {% endtabs %} [SequencerRegistry](/spec/system-contracts/sequencer-registry.md) system contract, [Oracle](/spec/system-contracts/oracle.md) v2.0.0 with dynamic system address, caller-account update deduplication for [data size](/spec/megaevm/resource-accounting.md#data-size) and [KV updates](/spec/megaevm/resource-accounting.md#kv-updates), [storage gas stipend](/spec/reference/glossary.md#storage-gas-stipend) separated-allowance model, value-transfer CALL/CALLCODE parent [compute gas](/spec/reference/glossary.md#compute-gas) attribution, CREATE code-deposit compute-gas atomicity, EIP-2935/EIP-4788 pre-block gas floor with fail-closed block rejection, CREATE2 empty-initcode short-circuit, [KeylessDeploy](/spec/system-contracts/keyless-deploy.md) trailing-bytes rejection, sandbox resource accounting, and empty-code log forwarding, precompile compute gas correction, EIP-7702 [state growth](/spec/megaevm/resource-accounting.md#state-growth) tracking, non-delegating metering inspection, SELFDESTRUCT beneficiary accounting. ### [Rex6](/spec/network-upgrades/rex6.md) Unstable; not yet activated. Unified per-opcode [gas metering order](/spec/megaevm/dual-gas-model.md#gas-metering-order), consolidated EIP-7702 authorization accounting with dynamic SALT account-creation gas for net-new authorities, CREATE-frame accounting corrections, [KeylessDeploy](/spec/system-contracts/keyless-deploy.md) sandbox hardening, post-execution fee-reward accounting, [system-originated transaction](/spec/system-contracts/system-tx.md#system-originated-transaction-metering-exemption) metering exemption, extended beneficiary detention / volatile-access coverage, per-log [data size](/spec/megaevm/resource-accounting.md#data-size) base, forwarded-gas return on compute-limit halts, value self-transfer account-info dedup, [SequencerRegistry](/spec/system-contracts/sequencer-registry.md) v2.0.0 rotation hardening (EIP-712 possession proof + minimum rotation delay). ## How to Read These Pages Each upgrade page follows a consistent structure: * **Summary** — What changed and why * **What Changed** — Previous vs new behavior for each change * **Developer Impact** — What contract authors and integrators need to know * **Safety and Compatibility** — Backward-compatibility boundaries and failure-mode differences * **References** — Links to the normative spec and related documentation --- # Agent Instructions This documentation is published with GitBook. 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