> 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/system-contracts.md).

# System Contracts

- [Overview](https://docs.megaeth.com/spec/system-contracts/overview.md): MegaETH system contract registry — addresses, whitelisting rules, and protocol-level execution constraints.
- [Oracle](https://docs.megaeth.com/spec/system-contracts/oracle.md): MegaETH Oracle system contract — address, storage layout, hint forwarding, and gas detention trigger.
- [High-Precision Timestamp](https://docs.megaeth.com/spec/system-contracts/high-precision-timestamp.md): High-Precision Timestamp system contract — sub-second timestamp oracle service backed by Oracle storage.
- [Keyless Deployment](https://docs.megaeth.com/spec/system-contracts/keyless-deploy.md): KeylessDeploy system contract semantics for deterministic deployment via pre-EIP-155 transactions.
- [MegaAccessControl](https://docs.megaeth.com/spec/system-contracts/mega-access-control.md): MegaAccessControl system contract — proactive volatile data access restriction for call subtrees.
- [MegaLimitControl](https://docs.megaeth.com/spec/system-contracts/mega-limit-control.md): MegaLimitControl system contract — runtime query for effective remaining compute gas under detention and call-frame limits.
- [SequencerRegistry](https://docs.megaeth.com/spec/system-contracts/sequencer-registry.md): SequencerRegistry system contract — dual-role registry for system address and sequencer, with change scheduling and history.
- [Call Interception](https://docs.megaeth.com/spec/system-contracts/interception.md): Generic call-interception mechanism for MegaETH system contracts — frame-init hook, selector matching, intercepted vs. fall-through semantics, gas treatment, and call-scheme rules.
- [Mega System Transactions](https://docs.megaeth.com/spec/system-contracts/system-tx.md): Mega system transactions — sender/recipient identification rules, whitelisted contracts, and execution bypass semantics.


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