Transaction Types

Legacy, EIP-2930, EIP-1559, EIP-7702, and Deposit transaction options.

mega-evme supports five transaction types via the --tx-type flag. The transaction type determines which additional options are available and how the transaction is encoded.

Common Transaction Options

These options apply to all transaction types in the run and tx commands.

Flag	Default	Aliases	Description
--tx-type <TYPE>	0	--type, --ty	Transaction type number
--gas <AMOUNT>	10000000	--gas-limit	Gas limit
--basefee <AMOUNT>	0	--gas-price, --price, --base-fee	Gas price (Legacy) or max fee per gas (EIP-1559)
--priority-fee <AMOUNT>	N/A	--priorityfee, --tip	EIP-1559 max priority fee per gas
--sender <ADDRESS>	0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266	--from	Transaction sender
--receiver <ADDRESS>	0x0000…0000	--to	Transaction receiver
--nonce <NONCE>	0	—	Transaction nonce
--create	false	—	Execute in create mode (deploy contract). Requires explicit true.
--value <AMOUNT>	0	—	ETH value in wei (supports 1ether, 100gwei, 1000wei suffixes)
--input <HEX>	N/A	--data	Transaction calldata as hex
--inputfile <PATH>	N/A	--datafile, --input-file, --data-file	Calldata from file (- for stdin)

Type 0 — Legacy

The default transaction type. Uses a single gas price (--basefee) for all gas costs.

mega-evme tx --tx-type 0 \
  --sender.balance 1ether \
  --receiver 0x4200000000000000000000000000000000000006 \
  --gas 100000 \
  --basefee 1000000000 \
  --input 0x06fdde03

A transaction with a non-zero --basefee requires the sender to hold enough balance to cover gas × basefee; fund it with --sender.balance (or run against forked/prestate state).

Type 1 — EIP-2930 (Access List)

Adds an access list to declare which addresses and storage slots the transaction will touch. Pre-warming the access list reduces gas costs for those accesses from cold to warm.

Additional Options

Flag	Default	Aliases	Description
--access <ENTRY>	N/A	--accesslist, --access-list	Access list entry (repeatable)

Access list entry format:

• ADDRESS — pre-warm an address (no storage keys)
• ADDRESS:KEY1,KEY2,... — pre-warm an address and specific storage keys (comma-separated)

Storage keys are full 32-byte hex values (64 hex digits, 0x-prefixed); abbreviated forms like 0x0 are rejected.

mega-evme tx --tx-type 1 \
  --receiver 0x4200000000000000000000000000000000000006 \
  --access "0x4200000000000000000000000000000000000006" \
  --access "0x28B7E77f82B25B95953825F1E3eA0E36c1c29861:0x0000000000000000000000000000000000000000000000000000000000000000,0x0000000000000000000000000000000000000000000000000000000000000001" \
  --input 0x06fdde03

Type 2 — EIP-1559

Uses a base fee + priority fee model instead of a flat gas price. Also supports access lists.

mega-evme tx --tx-type 2 \
  --sender.balance 1ether \
  --receiver 0x4200000000000000000000000000000000000006 \
  --basefee 30000000000 \
  --priority-fee 1000000000 \
  --access "0x4200000000000000000000000000000000000006:0x0000000000000000000000000000000000000000000000000000000000000000" \
  --input 0x06fdde03

Type 4 — EIP-7702 (Authorization)

Allows an EOA to temporarily delegate its execution to a contract via authorization tuples. Also supports access lists.

Additional Options

Flag	Default	Aliases	Description
--auth <AUTH>	N/A	--authorization	Authorization tuple (repeatable)

Authorization format: AUTHORITY:NONCE->DELEGATION

• AUTHORITY — address of the EOA delegating control
• NONCE — authorization nonce (decimal or 0x-prefixed hex)
• DELEGATION — address of the contract to delegate to

# Single authorization — delegate the sender's EOA to Multicall3
mega-evme tx --tx-type 4 \
  --auth "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266:0->0xcA11bde05977b3631167028862bE2a173976CA11" \
  --receiver 0x4200000000000000000000000000000000000006

# Multiple authorizations
mega-evme tx --tx-type 4 \
  --auth "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266:0->0xcA11bde05977b3631167028862bE2a173976CA11" \
  --auth "0x70997970C51812dc3A010C7d01b50e0d17dc79C8:1->0xcA11bde05977b3631167028862bE2a173976CA11" \
  --receiver 0x4200000000000000000000000000000000000006

Type 126 — Deposit (Optimism)

A deposit transaction mints ETH from L1 and optionally executes a call. These are system-level transactions used by the Optimism bridge.

Additional Options

Flag	Default	Aliases	Description
--source-hash <HASH>	N/A	--sourcehash	Source hash identifying the deposit origin (B256)
--mint <AMOUNT>	N/A	—	Amount of ETH to mint to the sender (in wei)

mega-evme tx --tx-type 126 \
  --sender 0x4200000000000000000000000000000000000010 \
  --receiver 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 \
  --mint 1000000000000000000 \
  --source-hash 0xabc123...