Cell Structure

The cell structure of swapping sUDT/sUDT is almost same with swapping sUDT/CKB with minor changes.

Swap Request Cell

Swap request cell is used for selling or buying assets.

cell capacity - 227 bytes

{

capacity: - 8 bytes

data: - 16 bytes for sell

sudt_amount: u128

type: sudt_type for sell - 65 bytes

lock: - 138 bytes

code: SWAP_REQ_LOCK_CODE_HASH - 32 bytes + 1 byte

args: sudt_type_hash (32 bytes, 0..32) |

version (u8, 1 byte, 32..33) |

amountOutMin (u128, 16 bytes, 33..49) |

user_lock_hash (32 bytes, 49..81) |

tips (8 bytes, 81..89) |

tips_sudt (16 bytes, 89..105)

}

Field description :

Same with sUDT/CKB swap request cell

Liquidity Request Cell

Liquidity request cell is used for add liquidity to liquidity pool or remove liquidity from liquidity pool by liquidity provider.

{

capacity: - 8 bytes

data: - 16 bytes

sudt_amount: u128

type: sudt_x_type - 65 bytes

lock: - 170 bytes

code: LIQUIDITY_LOCK_CODE_HASH - 32 bytes + 1 byte

args: info_type_hash (32 bytes, 0..32)

| user_lock_hash (32 bytes, 32..64)

| version (u8, 1 byte, 64..65)

| sudt_x_min (u128, 16 bytes, 65..81)

| sudt_y_min (u128, 16 bytes, 81..97)

| tips_ckb(8 bytes, 97..105)

| tips_sudt_x/tips_sudt_lp (16 bytes, 105..121)

| tips_sudt_y (16 bytes, 121..137)

}

Field description : (total size: 235 bytes)

Same with sUDT/CKB liquidity request cell

Info Cell

Info cell represents the current state of liquidity pool.

cell capacity: 250 bytes

{

capacity: - 8 bytes

data: - 80 bytes

sudt_x_reserve: u128

sudt_y_reserve: u128

total_liquidity: u128

sudt_lp_type_hash: 32 bytes

type: - 65 bytes

code: INFO_TYPE_CODE_HASH - 32 bytes + 1 byte

args: id - 32 bytes

lock: - 97 bytes

code: INFO_TYPE_CODE_HASH - 32 bytes + 1 byte

args: hash(sudt_x_type_hash | sudt_y_type_hash) - 32 bytes

| info_type_hash - 32 bytes

}

Field description :（total size: 250 bytes)

• lock script
  • hash(ckb | asset_sudt_type_hash)(size: 32 bytes): The order of sUDT in here follows dictionary order

Pool Cell

Pool cell is used for fund custody.

cell size - 186 bytes

{

capacity: - 8 bytes

data: - 16 bytes

sudt_amount

type: sudt_type - 65 bytes

lock: info_lock - 97 bytes

}

Field description : （total size: 186 bytes)

• capacity

• data: The amount of sUDT in liquidity pool.

• type script: sUDT type.

• lock script: Same with info cell lock.

Liquidty Token Cell

cell size - 142 bytes

{

capacity: - 8 bytes

data: amount: u128 - 16 bytes

type: - 65 bytes

code: sudt_type_script

args: info_cell_lock_hash

lock: user_lock - 53 bytes

}