Delegated + Self

createDelegatedAndSelf() separates the trader from the executor.

the trader EOA owns USDC and positions
a delegate EOA signs each action
the delegate EOA submits the transaction and pays gas

When to use it

backend systems trading on behalf of users
managed execution products
integrations where users keep custody but your server handles submission

One-time trader setup

Before this mode can trade, the trader must:

await traderClient.approveUsdc('max');
await traderClient.setDelegate('0xDelegateAddress');

Submit-capable client

const client = await OstiumClient.createDelegatedAndSelf({
  delegatePrivateKey: process.env.DELEGATE_PRIVATE_KEY as `0x${string}`,
  traderAddress: '0xTraderAddress',
  rpcUrl: process.env.ARB_RPC_URL!,
});

Build-only client

const client = await OstiumClient.createDelegatedAndSelf({
  traderAddress: '0xTraderAddress',
  delegateAddress: '0xDelegateAddress',
});

In build-only mode, get*Tx() returns an EOA request whose calldata is already wrapped for delegated execution.

Parameters

Field	Type	Required	Notes
`delegatePrivateKey`	`0x${string}`	Submit-capable	Delegate EOA key. Signs and pays gas.
`traderAddress`	`0x${string}`	Yes	Trader the delegate acts for. Must have called `setDelegate(delegateAddress)`.
`delegateAddress`	`0x${string}`	Build-only	Delegate EOA that will submit the transaction.
`rpcUrl`	`string`	Submit-capable; optional for build-only	Arbitrum RPC URL. Build-only defaults to the public RPC.

Plus the shared options (testnet, slippageBps, builder, subgraphUrl, builderApiUrl, alchemyApiKey). See Client Configuration.

⌘I

SDK

Client Modes

Helpers

Read Methods

Write Methods

Builder API

Builder

Trader

Legacy

Delegated + Self

When to use it

One-time trader setup

Submit-capable client

Build-only client

Parameters

​When to use it

​One-time trader setup

​Submit-capable client

​Build-only client

​Parameters

When to use it

One-time trader setup

Submit-capable client

Build-only client

Parameters