fee_schedule.md

Fee Schedule

Fees are charged in three different ways:

• running opcodes
• expanding memory
• calls to EEI methods

Opcodes

All fees for opcodes are currently 1 gas. This needs to be updated before finalising this specification.

Registers

Opcode	Price
get_local	1
set_local	1
tee_local	1
get_global	1
set_global	1

Memory

Opcode	Price
i32.load8_s	1
i32.load8_u	1
i32.load16_s	1
i32.load16_u	1
i32.load	1
i64.load8_s	1
i64.load8_u	1
i64.load16_s	1
i64.load16_u	1
i64.load32_s	1
i64.load32_u	1
i64.load	1
grow_memory	1
current_memory	1

Flow Control

Opcode	Price
nop	1
block	1
loop	1
if	1
br	1
br_if	1
br_table	1
return	1

Calls

Opcode	Price
call	1
call_indirect	1
call_import	1

Constants

Opcode	Price
i32.const	1
i64.const	1

32-bit Integer operators

Opcode	Price
i32.add	1
i32.sub	1
i32.mul	1
i32.div_s	1
i32.div_u	1
i32.rem_s	1
i32.rem_u	1
i32.and	1
i32.or	1
i32.xor	1
i32.shl	1
i32.shr_u	1
i32.shr_s	1
i32.rotl	1
i32.rotr	1
i32.eq	1
i32.ne	1
i32.lt_s	1
i32.le_s	1
i32.lt_u	1
i32.le_u	1
i32.gt_sa	1
i32.ge_s	1
i32.gt_u	1
i32.ge_u	1
i32.clz	1
i32.ctz	1
i32.popcnt	1
i32.eqz	1

64-bit Integer operators

Opcode	Price
i64.add	1
i64.sub	1
i64.mul	1
i64.div_s	1
i64.div_u	1
i64.rem_s	1
i64.rem_u	1
i64.and	1
i64.or	1
i64.xor	1
i64.shl	1
i64.shr_u	1
i64.shr_s	1
i64.rotl	1
i64.rotr	1
i64.eq	1
i64.ne	1
i64.lt_s	1
i64.le_s	1
i64.lt_u	1
i64.le_u	1
i64.gt_sa	1
i64.ge_s	1
i64.gt_u	1
i64.ge_u	1
i64.clz	1
i64.ctz	1
i64.popcnt	1
i64.eqz	1

Datatype conversions, truncations, reinterpretations, promotions, and demotions

Opcode	Price
i32.wrap/i64	1
i64.extend_s/i32	1
i64.extend_u/i32	1

Type-parametric operators.

Opcode	Price
drop	1
select	1

Other

Opcode	Price
unreachable	1

Expanding memory

Memory can be expanded in pages, where a page corresponds to 65536 bytes of space.

The EVM1 formula for extending memory is words * 3 + words ^ 2 / 512 where word corresponds to 32 bytes.

From this we can calculate that a 65536 byte page should cost 14336 gas.

Calls to the EEI

Calls to the EEI are charged the same price as their equivalent EVM1 opcode.

Method	EVM1 Opcode
getAddress	ADDRESS
getBalance	BALANCE
getBlockHash	BLOCKHASH
call	CALL
callDataCopy	CALLDATACOPY
getCallDataSize	CALLDATASIZE
callCode	CALLCODE
callDelegate	DELEGATECALL
storageStore	SSTORE
storageLoad	SLOAD
getCaller	CALLER
getCallValue	CALLVALUE
codeCopy	CODECOPY
getCodeSize	CODESIZE
getBlockCoinbase	COINBASE
create	CREATE
getBlockDifficulty	DIFFICULTY
externalCodeCopy	EXTCODECOPY
getExternalCodeSize	EXTCODESIZE
getGasLeft	GAS
getBlockGasLimit	GASLIMIT
getTxGasPrice	GASPRICE
log	LOGn
getBlockNumber	NUMBER
getTxOrigin	ORIGIN
return	RETURN
selfDestruct	SELFDESTRUCT
getBlockTimestamp	TIMESTAMP