trident/os/arbitrum.md

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Arbitrum (Stylus) — Operating System

← Target Reference | VM: WASM + EVM

Runtime Parameters

Parameter Value
VM WASM (Stylus) + EVM (coexisting)
Runtime binding arbitrum.ext.*
Account model Account (EVM-compatible)
Storage model EVM storage (SLOAD/SSTORE)
Cost model Gas (EVM-compatible units, lower cost per WASM op)
Cross-chain Ethereum L2 (rollup)

Runtime Binding (arbitrum.ext.*)

  • EVM storage — SLOAD/SSTORE (shared with EVM contracts)
  • Contract calls — WASM ↔ EVM cross-calls, Solidity ABI compatible
  • msg context — msg.sender, msg.value, block context
  • Events — LOG opcodes (EVM-compatible event logging)

Notes

Arbitrum is the largest Ethereum L2 ($8B+ TVL). Stylus adds WASM execution alongside EVM — both VMs coexist with full interoperability. WASM contracts can call and be called by Solidity contracts seamlessly.

10-100x faster than EVM for compute-heavy workloads. 26-50% gas savings on oracle operations. Gas model is EVM-compatible — same units, same block limits, but WASM execution costs less per operation.

For WASM VM details (instruction set, lowering path, bytecode format), see wasm.md.

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