LpAccount (v1)

STON.fi v1 LpAccount contract - manages liquidity provider positions and LP token minting

Off-chain get methods

get_lp_account_data

Returns current state of the lp account: owner address, pool address and amount of both Jetton tokens.

(slice, slice, int, int) get_lp_account_data() method_id;

Arguments

None

Result

Returns the current state of the lp account.

Return structure

Key	Type	Index	Description
user_address	address	0	Owner's address
pool_address	address	1	Pool's address
amount0	coins	2	Balance of th e first Jetton token (in basic token units)
amount1	coins	3	Balance of the second Jetton token (in basic token units)

On-chain queries

On-chain counterparts of getter methods.

Operations table

Name	Value	Description
getter_lp_account_data	0x1d439ae0	Sends a message with the current state of the pool

getter_lp_account_data (0x1d439ae0)

Sends a message with current state of the lp account. On-chain equivalent of get_lp_account_data.

TL-B

getter_lp_account_data#1d439ae0 query_id:uint64 = InternalMsgBody;

Message body

None

Outgoing messages

Sends a message with current state of the lp account to sender_address

Response message body

Name	Type	Description
op	uint32	Operation code equal to getter_lp_account_data
query_id	uint64	Query id
user_address	address	Owner's address
pool_address	address	Pool's address
amount0	coins	Balance of the first Jetton token (in basic token units)
amount1	coins	Balance of the second Jetton token (in basic token units)

Pool message handlers

Handles incoming messages from a pool

Operations table

Name	Value	Description
add_liquidity	0x3ebe5431	Add liquidity

add_liquidity (0x3ebe5431)

Stores the sent amount of tokens by the user to be added as new liquidity. Upon receiving an appropriate amount of both tokens sends a message with those amounts to a pool to be added as new liquidity. The automatic liquidity addition happens only if the amount of both tokens if greater than 1000 and non-zero min_lp_out was specified, otherwise the user can keep increasing the amount of stored tokens.

TL-B

add_liquidity#3ebe5431 query_id:uint64 new_amount0:Grams new_amount1:Grams min_lp_out:Grams = InternalMsgBody;

Message body

Name	Type	Description
new_amount0	coins	Amount of the first Jetton tokens added (in basic token units)
new_amount1	coins	Amount of the second Jetton tokens added (in basic token units)
min_lp_out	coins	Minimum required amount of received new liquidity tokens (in basic token units)

Notes:

• addition of liquidity will fail if a user should receive less than min_lp_out of lp tokens as a result

Outgoing messages

Sends a message to the pool with cb_add_liquidity op

Response message body

Name	Type	Description
op	uint32	Operation code, equal to cb_add_liquidity
query_id	uint64	Query id
amount0	coins	Amount of the first Jetton tokens added (in basic token units)
amount1	coins	Amount of the second Jetton tokens added (in basic token units)
user_address	address	Owner's address
min_lp_out	coins	Minimum amount of received liquidity tokens (in basic token units)

Notes:

• addition of liquidity will fail if a user should receive less than min_lp_out of lp tokens as a result

User message handlers

Handles incoming messages from a user

Operations table

Name	Value	Description
refund_me	0xbf3f447	Return previously sent tokens back to the user
direct_add_liquidity	0x4cf82803	Directly add liquidity with specified amount of tokens and a minimum amount of received liquidity tokens
reset_gas	0x42a0fb43	Reset gas

refund_me (0xbf3f447)

Initiates a refund of stored tokens by add_liquidity if the user decides to cancel the addition of new liquidity. The amount of stored tokens will be sent to the pool which will initiate a transfer back to the user.

TL-B

refund_me#bf3f447 query_id:uint64 = InternalMsgBody;

Message body

None

Outgoing messages

Sends a message with cb_refund_me op code and amount of stored tokens to a pool. The pool will send a message to refund those tokens back to the user.

Response message body

Name	Type	Description
op	uint32	Operation code
query_id	uint64	Query id
amount0	coins	Amount of the first Jetton tokens (in basic token units)
amount1	coins	Amount of the second Jetton tokens (in basic token units)
user_address	address	Owner's address

direct_add_liquidity (0x4cf82803)

Initiates an addition of new liquidity to a pool with a specified amount of both tokens and a minimum amount of received liquidity. The operation is successful only if there's an equal or greater amount of both tokens stored in the account (the amount of both tokens must be greater than 1000). This method is useful if an automatic liquidity addition has not been triggered upon deposition of tokens.

TL-B

direct_add_liquidity#4cf82803 query_id:uint64 amount0:Grams amount1:Grams min_lp_out:Grams = InternalMsgBody;

Message body

Name	Type	Description
amount0	coins	Amount of the first Jetton tokens (in basic token units)
amount1	coins	Amount of the second Jetton tokens (in basic token units)
min_lp_out	coins	Minimum amount of received liquidity tokens (in basic token units)

Notes:

• addition of liquidity will fail if a user should receive less than min_lp_out of lp tokens as a result

• min_lp_out value must be greater than zero for this operation to proceed

Outgoing messages

Sends a message with cb_add_liquidity op code and amount of both tokens to be added as new liquidity.

Response message body

Name	Type	Description
op	uint32	Operation code
query_id	uint64	Query id
am0	coins	Amount of the first Jetton tokens (in basic token units)
am1	coins	Amount of the second Jetton tokens (in basic token units)
user_address	address	Owner's address
min_lp_out	coins	Minimum amount of received liquidity tokens (in basic token units)

Notes:

• addition of liquidity will fail if a user should receive less than min_lp_out of lp tokens as a result

reset_gas (0x42a0fb43)

Updates the amount of $TON (in nanoTons) on the lp account to REQUIRED_TON_RESERVE (10000000) of the account. The remaining $TON will be sent back to the user_address

TL-B

reset_gas#42a0fb43 query_id:uint64 = InternalMsgBody;

Message body

None

Outgoing messages

Sends an empty message back to the user with the remaining $TON

Constants

Name	Value	Description
WORKCHAIN	0	Workchain id
REQUIRED_TON_RESERVE	10000000	Amount of $TON (in nanoTons) to be left on the lp account contract as gas