monad

Install the Monad Foundry fork with foundryup --network monad, set evm_version to prague in foundry.toml, then run forge create with your keystore account against https://rpc.monad.xyz. Verify afterward on MonadVision via Sourcify or Monadscan via the Etherscan v2 API.

Monad charges gas_limit multiplied by gas price, not gas_used, because execution is asynchronous and usage is unknown at consensus time. Set explicit tight gas limits, such as 21000 for transfers, to avoid overpaying for unused gas.

No, Monad does not support type 3 blob transactions. It supports transaction types 0, 1, 2, and 4, with type 2 EIP-1559 recommended and type 4 EIP-7702 supported with Monad-specific restrictions like a 10 MON minimum balance.

Common causes include insufficient balance for the ~10 MON reserve requirement, wrong EVM version instead of prague, not using the Monad Foundry fork, or gas limits set too low. Check your balance with cast balance and confirm your toolchain configuration.

Send a standard CALL to 0x0000000000000000000000000000000000001000 with the function selector, such as 0x84994fec for delegate with a uint64 validator ID. STATICCALL, DELEGATECALL, and CALLCODE are not permitted, so use low-level .call() in Solidity.

Per-user mappings parallelize well because transactions touch independent storage slots, while global counters and single-pool AMM swaps serialize due to write conflicts. No Solidity changes are needed since parallelism happens at the runtime level with optimistic conflict detection.