This SDK contains 3 classes to interact with the GooseFX onchain perpetual futures.
Perp
Product
Trader
The Perp
class is required to initialise the connection and wallet that is going to be used for subsequent interaction.
Initialising the Perp
class should be the first step irrespective of the type of operation in the following manner:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
Product
An instance of the product
class signfies one of the perp product we offer to trade. Initialization of the product
class can be done in one of two ways:
 By index:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const product = new Product(perp);
product.initByIndex(0);
 By name:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const product = new Product(perp);
product.initByName('SOLPERP');
This product
instance will be useful for the following functions:

GET L2 Orderbook
: Get the latest layer 2 orderbook
const orderbook = await product.getOrderbookL2();

GET L3 Orderbook
: Get the latest layer 3 orderbook. (Orders mapped to users)
const orderbook = await product.getOrderbookL3();

Subscribe to Orderbook
: Subscribe to the orderbook account and listen to changes. In the example below,handleAccountChange
is the callback function which will be called on each state change of the orderbook. Pass your function as the parameter to thesubscribeToOrderbook
function to handle orderbook changes and do not forget to unsubscribe when not needed anymore!
async function handleAccountChange(){
const res = await product.getOrderbookL2();
console.log("Updated orderbook: ", res);
}
const subscribeId = product.subscribeToOrderbook(handleAccountChange);
connection.removeAccountChangeListener(subscribeId); //To close the subscription
Trader
The Trader
class is required to get instructions to send transactions to the program. Each wallet must have a unique trader account initialized to be able to place orders and deposit funds. This account needs to be created once using the createTraderAccountIxs
instruction. After it has been created once, for all subsequent interactions by the wallet, the Trader
class needs to be initialized using the init
function.
 To create a new
Trader
account onchain:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const trader = new Trader(perp);
const [ixs, signers] = await trader.createTraderAccountIxs();
where ixs
is an array of required instructions and signers
is an array of required keypairs for signature. The wallet must also sign the transaction along with the keypairs in the signers
array
 Once the account is created successfully, the
Trader
instance must be initialised in the following way:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const trader = new Trader(perp);
await trader.init();
Fractional Datatype
The Fractional data type uses a simple formula to represent a fractional number based on its mantissa (m) and exponent (exp):
number = mantissa / (10 ^ exponent)
Trader Instructions
Deposit Funds
To start placing new orders, traders need to deposit some collateral. This instruction will transfer the required USDC from the wallet to the trader account which will be used as collateral to place new orders.
The only parameter to this function is the amount of USDC to be depositted.
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const trader = new Trader(perp);
await trader.init();
const ix = await trader.depositFundsIx(new Fractional({
m: new BN(1),
exp: new BN(0)
}));
Withdraw Funds
Similar to deposit funds, this function takes the amount of USDC to be withdrawn as the only parameter. This instruction will transfer funds from the trader account to the wallet address.
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const trader = new Trader(perp);
await trader.init();
const ix = await trader.withdrawFundsIx(new Fractional({
m: new BN(1),
exp: new BN(0)
}));
NOTE: The above two instructions do not need a product
instance as a parameter since the market is cross collateralized and the amount of USDC deposited can be used across products. The following two instructions to place a new order and cancel an order are specific to products and hence need a product
instance as one of the parameters.
Trader's open orders for a prouct
To get all open orders for a Trader
for a product
:
const perp = new Perp(connection, 'mainnet', wallet);
await perp.init();
const product = new Product(perp);
product.initByIndex(0);
const trader = new Trader(perp);
await trader.init();
const orderbookData = await trader.getOpenOrders(product);
console.log("orderbook: ", orderbookData);
New Order
The New order instruction needs the following as parameters
 Quantity (Fractional) Please note: 1 unit of the product is denoted by 1 * 100000 units. So to buy 1 unit, the parameter to pass as quantity should be
new Fractional({
m: new BN(100000),
exp: new BN(0)
})
 Price (Fractional)
 Order side ('buy' or 'sell')
 Order Type ('limit', 'market', 'immediateOrCancel', 'postOnly')
 Product instance
const perp = new Perp(connection, "mainnet", wallet);
await perp.init();
const product = new Product(perp);
product.initByIndex(0);
const trader = new Trader(perp);
await trader.init();
const ix = await trader.newOrderIx(
new Fractional({
m: new BN(10000), //Implies 0.1 units
exp: new BN(0),
}),
new Fractional({
m: new BN(2245), //Price 22.45$
exp: new BN(2),
}),
"buy",
"limit",
product
);
Cancel Order
The cancel order instruction needs the orderId in string format to cancel the order. Use getOpenOrders()
to get open orders and its id's to pass as a parameter to cancel the order
const perp = new Perp(connection, "mainnet", wallet);
await perp.init();
const product = new Product(perp);
product.initByIndex(0);
const trader = new Trader(perp);
await trader.init();
const ix = await trader.cancelOrderIx("7922816251444880503428103912726", product);
Checkout https://github.com/GooseFX1/gfxperptssdk/blob/main/test/index.test.js for examples on the above functionalities! Happy trading!