CoreWriter Workbench

Decode or build raw CoreWriter action bytes, see raw integers next to human units, generate cast and Solidity, and query every read precompile live.

Last verified against protocol docs: 2026-09-28

Source: Interacting with HyperCore

rules: corewriter@1.0.0 · precompiles@1.0.0

Trace a transaction end to end

Raw action bytes

The bytes passed to CoreWriter.sendRawAction — or the full sendRawAction calldata.

Hex

228 bytes

Samples

Limit orderid 1v1mainnet

HyperCore equivalent: order. Price and size are always 1e8-scaled regardless of the market's szDecimals; HyperCore still applies tick/lot rules after scaling back.

Delayed a few seconds on HyperCore

field	type	raw	human
asset Action asset ID.	uint32	1	—
isBuy true = buy / long.	bool	true	true
limitPx Limit price × 10^8.	uint64	266710000000	2667.1 raw ÷ 10^8
sz Size × 10^8.	uint64	500000	0.005 raw ÷ 10^8
reduceOnly Reduce-only flag.	bool	false	false
encodedTif 1 = Alo, 2 = Gtc, 3 = Ioc.	uint8	3	Ioc
cloid Client order ID; 0 = none.	uint128	33030591453973266023797138155905	0x000001a0e798df33f294ce1e316c6981 as 16-byte hex

228 bytes

01000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000003e1927a180000000000000000000000000000000000000000000000000000000000007a1200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000001a0e798df33f294ce1e316c6981

Hover or tap a byte to see which field it encodes.228 bytes

Send it yourself

Generated commands never include a private key.

Calling contract / sender (optional)

Used as --from for cast call. The sender must already exist on HyperCore.

cast send 0x3333333333333333333333333333333333333333 \
  "sendRawAction(bytes)" 0x01000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000003e1927a180000000000000000000000000000000000000000000000000000000000007a1200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000001a0e798df33f294ce1e316c6981 \
  --rpc-url https://rpc.hyperliquid.xyz/evm \
  --ledger  # or --account <keystore>; never paste a raw private key