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fee_schedule.md

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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