### Install Ostium SDK

Source: https://docs.ostium.com/developer/sdk/overview

Install the required SDK and viem dependencies.

```bash
npm install @ostium/builder-sdk viem
```

--------------------------------

### Setup and Delegation

Source: https://docs.ostium.com/developer/client-modes/self-and-gasless

Required one-time setup steps to enable gasless trading for a trader EOA.

```APIDOC
## Setup and Delegation

### Description
Before gasless trading can occur, the trader must perform a one-time setup to approve USDC and delegate gasless submission rights.

### Methods
- **approveUsdc('max')**: Approves the maximum amount of USDC for the trading contract.
- **setupGaslessDelegation()**: Configures the delegation required for the Safe to submit trades on behalf of the EOA.

### Example
```ts
await client.approveUsdc('max');
await client.setupGaslessDelegation();
```
```

--------------------------------

### Trader Setup

Source: https://docs.ostium.com/developer/client-modes/delegated-and-self

Required setup steps for the trader before delegated execution can occur.

```APIDOC
## Trader Setup

### Description
Before trading can occur, the trader must approve USDC and set the delegate address on-chain.

### Usage Example
```ts
await traderClient.approveUsdc('max');
await traderClient.setDelegate('0xDelegateAddress');
```
```

--------------------------------

### Calculate Liquidation Threshold Example

Source: https://docs.ostium.com/traders/trading/liquidation

Example calculation for a 20x long position on a pair with 200x maximum leverage.

```text
100% − (20 / 200 × 25%) = 97.5%
```

--------------------------------

### Trader Setup Methods

Source: https://docs.ostium.com/developer/client-modes/delegated-and-gasless

Methods required for the trader to authorize the delegate Safe.

```APIDOC
## traderClient.approveUsdc

### Description
Approves the spending of USDC for the trader.

### Usage
```ts
await traderClient.approveUsdc('max');
```

## traderClient.setDelegate

### Description
Registers the delegate Safe address for the trader.

### Usage
```ts
await traderClient.setDelegate('0xDelegateSafeAddress');
```
```

--------------------------------

### Perform One-time Setup

Source: https://docs.ostium.com/developer/client-modes/self-and-gasless

The trader must execute these two EOA-signed transactions once to enable gasless delegation.

```ts
await client.approveUsdc('max');
await client.setupGaslessDelegation();
```

--------------------------------

### OstiumClient Initialization

Source: https://docs.ostium.com/developer/client-modes/configuration

The OstiumClient is initialized via async factory methods. Below is an example of initializing a client with shared configuration options.

```APIDOC
## OstiumClient.createSelfAndSelf

### Description
Initializes an OstiumClient instance. All factory methods return a Promise<OstiumClient> and must be awaited.

### Parameters
- **traderPrivateKey** (string) - Required - The private key of the trader.
- **rpcUrl** (string) - Required - The RPC URL for the Arbitrum network.
- **testnet** (boolean) - Optional - If true, uses Arbitrum Sepolia. Default: false.
- **slippageBps** (number) - Optional - Default slippage tolerance in basis points. Default: 25.
- **builder** (object) - Optional - Builder fee sharing configuration containing address (string) and feeBps (number).
- **subgraphUrl** (string) - Optional - Override for the Ostium subgraph endpoint.
- **builderApiUrl** (string) - Optional - Override for the builder API base URL.
- **alchemyApiKey** (string) - Optional - Alchemy API key required for streamAccountUpdates().

### Example
```ts
import { OstiumClient } from '@ostium/builder-sdk';

const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
  testnet: false,
  slippageBps: 25,
  builder: { address: '0xBuilderAddress', feeBps: 10 },
  alchemyApiKey: process.env.ALCHEMY_API_KEY!,
});
```
```

--------------------------------

### GET /v1/prices

Source: https://docs.ostium.com/developer/builder-api/get-prices

Fetches the current Ostium live price snapshot from the Builder API.

```APIDOC
## GET /v1/prices

### Description
Fetch the current Ostium live price snapshot directly from the Builder API.

### Method
GET

### Endpoint
https://builder.prod.bedrock.ostium.io/v1/prices

### Response
#### Success Response (200)
- **prices** (Array) - List of price objects containing feed_id, pair, from, to, bid, mid, ask, isMarketOpen, isDayTradingClosed, secondsToToggleIsDayTradingClosed, timestampSeconds, and schedule.
- **stale** (boolean) - Indicates if the data is stale.
- **generatedAt** (number) - Timestamp of when the response was generated.

### Response Example
{
  "prices": [
    {
      "feed_id": "string",
      "pair": "string",
      "from": "string",
      "to": "string",
      "bid": 0,
      "mid": 0,
      "ask": 0,
      "isMarketOpen": true,
      "isDayTradingClosed": false,
      "secondsToToggleIsDayTradingClosed": 0,
      "timestampSeconds": 0,
      "schedule": {
        "id": 0,
        "alwaysOpen": true,
        "timezone": "string",
        "openingHours": ["string"]
      }
    }
  ],
  "stale": false,
  "generatedAt": 0
}
```

--------------------------------

### Perform one-time trader setup

Source: https://docs.ostium.com/developer/client-modes/delegated-and-self

The trader must approve USDC and set the delegate address before trading can occur.

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

--------------------------------

### Initialize Build-only Client

Source: https://docs.ostium.com/developer/client-modes/self-and-gasless

Create a client for building transactions without submitting them. get*Tx() methods return Safe-style requests.

```ts
const client = await OstiumClient.createSelfAndGasless({
  traderAddress: '0xTraderAddress',
  safeAddress: '0xSafeAddress',
});

const tx = client.getOpenTradeTx({
  pairId: 0,
  buy: true,
  price: '65000',
  collateral: '100',
  leverage: '5',
  type: OrderType.Market,
});
```

--------------------------------

### Perform One-time Trader Setup

Source: https://docs.ostium.com/developer/client-modes/delegated-and-gasless

The trader must approve USDC and register the delegate Safe address before delegated actions can be performed.

```ts
await traderClient.approveUsdc('max');
await traderClient.setDelegate('0xDelegateSafeAddress');
```

--------------------------------

### GET /v1/prices

Source: https://docs.ostium.com/developer/builder-api/overview

Fetches current market prices.

```APIDOC
## GET /v1/prices

### Description
Fetches current market prices.

### Method
GET

### Endpoint
/v1/prices
```

--------------------------------

### Initialize OstiumClient with self-managed keys

Source: https://docs.ostium.com/developer/client-modes/configuration

Demonstrates creating a client instance using the createSelfAndSelf factory method with required authentication and configuration options.

```ts
import { OstiumClient } from '@ostium/builder-sdk';

const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
  // shared options below are accepted by every write mode
  testnet: false,
  slippageBps: 25,
  builder: { address: '0xBuilderAddress', feeBps: 10 },
  alchemyApiKey: process.env.ALCHEMY_API_KEY!,
});
```

--------------------------------

### Initialize OstiumClient with delegated gasless configuration

Source: https://docs.ostium.com/developer/builders/getting-keys-from-the-app

Use this snippet to initialize the client after exporting the delegate private key from the Ostium app. Ensure the private key is never committed to source control.

```ts
import { OstiumClient } from '@ostium/builder-sdk';

const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: '0xYourDelegateKey', // paste the key you saved in step 2
  traderAddress: '0xa02fa4da932f616975f258ce0a9077f8ed3564',
  // pimlicoUrl is optional — defaults to Ostium's sponsored Pimlico bundler on Arbitrum One
  // pimlicoUrl: 'https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=42161',
  // testnet: true, // Arbitrum Sepolia — uses the 421614 sponsor URL when pimlicoUrl is omitted
  // sponsorshipPolicyId: '...', // optional Pimlico sponsorship policy id
  // rpcUrl: 'https://arb-mainnet.g.alchemy.com/v2/...', // optional; public Arbitrum RPC for reads if omitted
});
```

--------------------------------

### Get Trader Address

Source: https://docs.ostium.com/developer/reference/get-trader-address

Retrieves the address of the connected trader. This method requires a write-enabled client.

```ts
const trader = client.getTraderAddress();
```

--------------------------------

### Initialize a submit-capable client

Source: https://docs.ostium.com/developer/client-modes/delegated-and-self

Creates a client that can sign and submit transactions using the delegate's private key.

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

--------------------------------

### Initialize Gasless Client

Source: https://docs.ostium.com/developer/builder-api/pimlico-sponsor

Creates a gasless client using the default Pimlico-compatible endpoint.

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

--------------------------------

### OstiumClient.createReadOnly()

Source: https://docs.ostium.com/developer/client-modes/read-only

Initializes a client instance in read-only mode, which does not require a private key or signer.

```APIDOC
## OstiumClient.createReadOnly()

### Description
Initializes the OstiumClient in a no-signing, no-submission mode. This mode is suitable for applications that only need to fetch market or account data.

### Parameters
- **rpcUrl** (string) - Optional - Arbitrum RPC URL for reads/simulation.
- **testnet** (boolean) - Optional - If true, uses Arbitrum Sepolia.
- **subgraphUrl** (string) - Optional - Override the default subgraph endpoint.
- **builderApiUrl** (string) - Optional - Override the builder API base URL.
- **alchemyApiKey** (string) - Optional - Required for streamAccountUpdates().

### Usage Example
```ts
const client = await OstiumClient.createReadOnly();

const { pairs } = await client.getPairs();
const { prices } = await client.getAllPrices();
const positions = await client.getOpenPositions({ user: '0xTraderAddress' });
```
```

--------------------------------

### Fetch Fills by Time Range with TypeScript

Source: https://docs.ostium.com/developer/traders/track-fills-and-history

Retrieves fills within a specific time window by providing a start time.

```ts
const weeklyFills = await client.getFillsByTime({
  startTime: Date.now() - 7 * 24 * 60 * 60 * 1000,
});
```

--------------------------------

### Initialize a submit-capable client

Source: https://docs.ostium.com/developer/client-modes/self-and-self

Creates a client instance that can sign and submit transactions directly to Arbitrum using a private key.

```ts
const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
});
```

--------------------------------

### Initialize Ostium Client

Source: https://docs.ostium.com/developer/traders/approvals-and-first-trade

Creates a new Ostium client instance using a private key and RPC URL.

```ts
import { OrderType, OstiumClient } from '@ostium/builder-sdk';

const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
});
```

--------------------------------

### Initialize OstiumClient

Source: https://docs.ostium.com/developer/builders/react-quickstart

Create a build-only client using trader and builder addresses to construct transaction calldata.

```ts
import { OrderType, OstiumClient } from '@ostium/builder-sdk';

const client = await OstiumClient.createSelfAndSelf({
  traderAddress: '0xTraderAddress',
  builder: {
    address: '0xYourBuilderAddress',
    feeBps: 20,
  },
});
```

--------------------------------

### Open a trade with the Builder SDK

Source: https://docs.ostium.com/developer/reference/open-trade

Executes a market order using the client's default configuration.

```ts
const result = await client.openTrade({
  pairId: 0,
  buy: true,
  price: '65000',
  collateral: '100',
  leverage: '10',
  type: OrderType.Market,
});
```

--------------------------------

### Initialize account stream

Source: https://docs.ostium.com/developer/reference/stream-account-updates

Create a client instance and subscribe to account updates using the default self-address configuration.

```ts
const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
  alchemyApiKey: process.env.ALCHEMY_API_KEY!,
});

const stream = client.streamAccountUpdates();

stream.onUpdate(snapshot => {
  const account = snapshot[client.getTraderAddress().toLowerCase()];
  console.log(account.positions);
  console.log(account.orders);
  console.log(account.limits);
});

stream.onError(error => console.error(error));
```

--------------------------------

### Client Creation

Source: https://docs.ostium.com/developer/api-and-sdk

Methods used to initialize the Ostium client based on the desired execution mode.

```APIDOC
## Client Creation Methods

### Description
Factory methods to initialize an Ostium client. Construction is lazy, and read methods will populate market metadata on first use.

### Methods
- `createSelfAndSelf`
- `createSelfAndGasless`
- `createDelegatedAndSelf`
- `createDelegatedAndGasless`
- `createReadOnly`
```

--------------------------------

### getSetupGaslessDelegationTx

Source: https://docs.ostium.com/developer/reference/transaction-builders

Builds a transaction to set up gasless delegation.

```APIDOC
## getSetupGaslessDelegationTx()

### Description
Builds the transaction required to enable gasless delegation for the client.

### Signature
`getSetupGaslessDelegationTx()`
```

--------------------------------

### Initialize a build-only client

Source: https://docs.ostium.com/developer/client-modes/self-and-self

Creates a client instance that generates transaction payloads for external signing, useful for wallet-driven applications.

```ts
const client = await OstiumClient.createSelfAndSelf({
  traderAddress: '0xTraderAddress',
});

const tx = client.getOpenTradeTx({
  pairId: 0,
  buy: true,
  price: '65000',
  collateral: '100',
  leverage: '5',
  type: OrderType.Market,
});
```

--------------------------------

### Initialize Submit-capable Client

Source: https://docs.ostium.com/developer/client-modes/self-and-gasless

Create a client capable of submitting gasless trades. Providing a safeAddress is optional if you wish to skip smart-account derivation.

```ts
const client = await OstiumClient.createSelfAndGasless({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  pimlicoUrl: 'https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=42161',
});
```

```ts
const client = await OstiumClient.createSelfAndGasless({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  safeAddress: '0xSafeAddress',
});
```

--------------------------------

### Open a market trade with Builder SDK

Source: https://docs.ostium.com/developer/traders/open-market-trade

Executes a market order using the client.openTrade method with specified pair, direction, price, collateral, and leverage.

```ts
import { OrderType } from '@ostium/builder-sdk';

const result = await client.openTrade({
  pairId: 0,
  buy: true,
  price: '65000',
  collateral: '100',
  leverage: '10',
  type: OrderType.Market,
  takeProfit: '72000',
  stopLoss: '61000',
});
```

--------------------------------

### OstiumClient.createDelegatedAndGasless

Source: https://docs.ostium.com/developer/client-modes/delegated-and-gasless

Initializes a client for delegated and gasless execution. This method supports both submit-capable clients (using a private key) and build-only clients.

```APIDOC
## OstiumClient.createDelegatedAndGasless

### Description
Creates a new client instance configured for delegated execution. This allows a delegate to perform actions on behalf of a trader, with transactions submitted via a Safe smart account.

### Parameters
- **delegatePrivateKey** (0x${string}) - Submit-capable - The private key of the delegate EOA.
- **traderAddress** (0x${string}) - Required - The address of the trader the delegate acts for.
- **delegateAddress** (0x${string}) - Build-only - The address of the delegate EOA.
- **safeAddress** (0x${string}) - Build-only/Optional - The address of the delegate's Safe smart account.
- **pimlicoUrl** (string) - Optional - The URL for the bundler/paymaster.
- **rpcUrl** (string) - Optional - The RPC URL for reads and simulation.
- **sponsorshipPolicyId** (string) - Optional - The Pimlico sponsorship policy ID.

### Usage Example
```ts
const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: '0x...',
  traderAddress: '0xTraderAddress',
  pimlicoUrl: 'https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=42161',
});
```
```

--------------------------------

### OstiumClient.createSelfAndSelf

Source: https://docs.ostium.com/developer/client-modes/self-and-self

Initializes a client instance in Self + Self mode. This method supports both submit-capable (with private key) and build-only (with address) configurations.

```APIDOC
## OstiumClient.createSelfAndSelf

### Description
Initializes the Ostium client for Self + Self mode. This mode is designed for bots, server-side systems, or wallet-driven applications where the trader EOA manages assets and gas payments.

### Parameters
- **traderPrivateKey** (0x${string}) - Submit-capable - The trader EOA private key. Required for submitting transactions directly.
- **traderAddress** (0x${string}) - Build-only - The trader EOA address. Used when the client is only generating transaction payloads.
- **rpcUrl** (string) - Optional - The Arbitrum RPC URL. Required for submit-capable clients; defaults to public RPC for build-only mode.

### Usage Example
```ts
// Submit-capable client
const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  rpcUrl: process.env.ARB_RPC_URL!,
});

// Build-only client
const client = await OstiumClient.createSelfAndSelf({
  traderAddress: '0xTraderAddress',
});
```
```

--------------------------------

### Fetch Open Positions with Various Filters

Source: https://docs.ostium.com/developer/reference/get-open-positions

Demonstrates how to retrieve positions for the connected wallet, specific traders, or all traders, including pagination options.

```ts
// Connected wallet (default)
const { pairPositions, marginSummary } =
  await client.getOpenPositions();

// Specific trader (read-only mode)
await client.getOpenPositions({ user: '0xTraderAddress' });

// All traders — no user filter
await client.getOpenPositions({ user: 'ALL' });

// Paginated — first page of 50
await client.getOpenPositions({ user: 'ALL', limit: 50, skip: 0 });

// Paginated — second page
await client.getOpenPositions({ user: 'ALL', limit: 50, skip: 50 });
```

--------------------------------

### setupGaslessDelegation()

Source: https://docs.ostium.com/developer/reference/setup-gasless-delegation

Registers the Safe address as a delegate for the trader EOA to enable gasless trading. This method should be called after initializing the client with createSelfAndGasless().

```APIDOC
## setupGaslessDelegation()

### Description
Registers the Safe returned by getSmartAccountAddress() as the delegate for the trader EOA, enabling gasless trading operations.

### Usage
```ts
await client.approveUsdc('max');
await client.setupGaslessDelegation();
```

### Response
- **txHash** (`0x${string}`) - The transaction hash of the delegation registration.
- **smartAccountAddress** (`0x${string}`, optional) - The address of the registered smart account.
```

--------------------------------

### OstiumClient.createDelegatedAndSelf

Source: https://docs.ostium.com/developer/client-modes/delegated-and-self

Initializes a client in Delegated and Self mode. This can be configured as a submit-capable client (providing a private key) or a build-only client (providing only addresses).

```APIDOC
## OstiumClient.createDelegatedAndSelf

### Description
Creates a client instance configured for delegated execution. The delegate EOA signs and pays gas on behalf of the trader EOA.

### Parameters
- **delegatePrivateKey** (0x${string}) - Submit-capable - The private key of the delegate EOA.
- **traderAddress** (0x${string}) - Required - The address of the trader the delegate acts for.
- **delegateAddress** (0x${string}) - Build-only - The address of the delegate EOA.
- **rpcUrl** (string) - Optional - The Arbitrum RPC URL to use.

### Usage Example
```ts
// 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',
});
```
```

--------------------------------

### Initialize Build-only Client

Source: https://docs.ostium.com/developer/client-modes/delegated-and-gasless

Creates a client that returns Safe-style requests with call data wrapped for delegated execution, without submitting transactions directly.

```ts
const client = await OstiumClient.createDelegatedAndGasless({
  traderAddress: '0xTraderAddress',
  delegateAddress: '0xDelegateAddress',
  safeAddress: '0xDelegateSafeAddress',
});
```

--------------------------------

### Configure Builder Fees at Client Creation

Source: https://docs.ostium.com/developer/builders/overview

Sets the builder address and fee basis points during the initial client instantiation. Fees are applied automatically to all opening trades.

```ts
const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: userPrivateKey,
  rpcUrl: process.env.ARB_RPC_URL!,
  builder: {
    address: '0xYourBuilderAddress',
    feeBps: 20,
  },
});
```

--------------------------------

### Configure builder fees during client creation

Source: https://docs.ostium.com/developer/builder-codes

Initialize the Ostium client with a builder address and fee in basis points. Fees are applied automatically to all trades opened through this client.

```typescript
const client = await OstiumClient.createSelfAndSelf({
  traderPrivateKey: userPrivateKey,
  rpcUrl: process.env.ARB_RPC_URL!,
  builder: {
    address: '0xYourBuilderAddress',
    feeBps: 20,
  },
});
```

--------------------------------

### getPairs()

Source: https://docs.ostium.com/developer/traders/discover-pairs

Fetches the complete market catalog including market state, leverage limits, and pricing information.

```APIDOC
## getPairs()

### Description
Retrieves the list of available Ostium markets. This method provides essential data including pair IDs, leverage limits, and market status required for trading operations.

### Method
SDK Method

### Signature
`client.getPairs()`

### Returns
- **pairs** (Array) - A list of market objects containing:
  - **pairId** (string) - Unique identifier for the market.
  - **pairFrom** (string) - The base asset.
  - **pairTo** (string) - The quote asset.
  - **maxLeverage** (number) - Maximum allowed leverage.
  - **overnightMaxLeverage** (number) - Maximum leverage allowed for overnight positions.
  - **midPx** (number) - Current mid-price of the pair.
  - **isMarketOpen** (boolean) - Indicates if the market is currently accepting trades.
```

--------------------------------

### Initialize Submit-capable Client

Source: https://docs.ostium.com/developer/client-modes/delegated-and-gasless

Creates a client capable of submitting transactions. You can optionally provide a pre-derived Safe address to skip the SDK's derivation process.

```ts
const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: process.env.DELEGATE_PRIVATE_KEY as `0x${string}`,
  traderAddress: '0xTraderAddress',
  pimlicoUrl: 'https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=42161',
});
```

```ts
const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: process.env.DELEGATE_PRIVATE_KEY as `0x${string}`,
  traderAddress: '0xTraderAddress',
  safeAddress: '0xDelegateSafeAddress',
});
```

--------------------------------

### Enable Testnet in OstiumClient

Source: https://docs.ostium.com/developer/client-modes/testnet

Configure the client for Arbitrum Sepolia by setting the testnet property to true during initialization.

```ts
const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: process.env.DELEGATE_PRIVATE_KEY as `0x${string}`,
  traderAddress: '0xTraderAddress',
  testnet: true,
});
```

--------------------------------

### SDK Configuration

Source: https://docs.ostium.com/developer/builder-api/subgraph

How to override the default subgraph URL when initializing the Ostium client.

```APIDOC
## SDK Configuration

### Description
To use a custom subgraph, override the default endpoint by providing the `subgraphUrl` parameter when creating the client.

### Example
```ts
const client = await OstiumClient.createReadOnly({
  subgraphUrl: 'https://your-subgraph.example.com/graphql',
});
```
```

--------------------------------

### Initialize Read-only Client

Source: https://docs.ostium.com/developer/client-modes/read-only

Basic initialization of the read-only client and retrieval of market data.

```ts
const client = await OstiumClient.createReadOnly();

const { pairs } = await client.getPairs();
const { prices } = await client.getAllPrices();
const positions = await client.getOpenPositions({ user: '0xTraderAddress' });
```

--------------------------------

### Open a Limit Order with Builder SDK

Source: https://docs.ostium.com/developer/traders/open-limit-or-stop-order

Use the openTrade method with OrderType.Limit to place a limit order. Ensure the price is set as the trigger price.

```ts
await client.openTrade({
  pairId: 0,
  buy: true,
  price: '64000',
  collateral: '100',
  leverage: '5',
  type: OrderType.Limit,
});
```

--------------------------------

### Initialize and Listen to Price Streams

Source: https://docs.ostium.com/developer/reference/stream-prices

Opens a WebSocket stream for specific pair IDs and registers handlers for snapshots and individual tick updates.

```ts
const stream = client.streamPrices([0, 1]);

stream.onSnapshot(ticks => {
  console.log(ticks);
});

stream.onTick(tick => {
  console.log(tick.pair, tick.mid);
});
```

--------------------------------

### getBalances()

Source: https://docs.ostium.com/developer/reference/get-balances

Fetches the USDC balance, ETH balance, and USDC allowance for an Ostium trader.

```APIDOC
## getBalances

### Description
Fetches USDC balance, ETH balance, and USDC allowance for an Ostium trader.

### Method
SDK Method

### Parameters
- **address** (string) - Optional - The address of the trader to fetch balances for. If not provided, it defaults to the authenticated client.

### Response
- **usdc** (string) - The USDC balance.
- **eth** (string) - The ETH balance.
- **allowance** (string) - The USDC allowance.

### Response Example
{
  "usdc": "string",
  "eth": "string",
  "allowance": "string"
}
```

--------------------------------

### Fetch prices via SDK

Source: https://docs.ostium.com/developer/builder-api/get-prices

Retrieve all prices using the client SDK method.

```ts
const { prices } = await client.getAllPrices();
```

--------------------------------

### Initialize a build-only client

Source: https://docs.ostium.com/developer/client-modes/delegated-and-self

Creates a client that generates transaction requests with calldata wrapped for delegated execution without submitting them.

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

--------------------------------

### SDK Price Stream Subscription

Source: https://docs.ostium.com/developer/builder-api/ws-prices-stream

Simplified method to initiate a price stream using the SDK.

```ts
const stream = client.streamPrices([0, 1]);
```

--------------------------------

### OstiumClient.createSelfAndGasless

Source: https://docs.ostium.com/developer/client-modes/self-and-gasless

Initializes an OstiumClient instance configured for Self + Gasless mode. This method supports both submit-capable clients (using a private key) and build-only clients (using an address).

```APIDOC
## OstiumClient.createSelfAndGasless

### Description
Creates a client instance that enables gasless trading by routing transactions through a Safe smart account. The client can be initialized for direct submission or for building transaction payloads.

### Parameters
- **traderPrivateKey** (0x${string}) - Submit-capable - The trader's EOA private key used to derive the Safe and sign trades.
- **traderAddress** (0x${string}) - Build-only - The trader's EOA address.
- **safeAddress** (0x${string}) - Build-only; optional submit-capable - The address of the Safe smart account. Required for build-only mode.
- **pimlicoUrl** (string) - Optional - The URL for the bundler/paymaster service.
- **rpcUrl** (string) - Optional - The RPC URL for blockchain interactions.
- **sponsorshipPolicyId** (string) - Optional - The Pimlico sponsorship policy ID.

### Usage Example
```ts
// Submit-capable client
const client = await OstiumClient.createSelfAndGasless({
  traderPrivateKey: '0x...',
  pimlicoUrl: 'https://...'
});

// Build-only client
const client = await OstiumClient.createSelfAndGasless({
  traderAddress: '0x...',
  safeAddress: '0x...'
});
```
```

--------------------------------

### getOpenPositions(params?: { user?: Address | 'ALL', blockNumber?: bigint, limit?: number, skip?: number })

Source: https://docs.ostium.com/developer/reference/get-open-positions

Fetches live Ostium positions and margin summary for a specific user or all traders.

```APIDOC
## getOpenPositions

### Description
Fetches live Ostium positions, margin summary, and withdrawable collateral. The returned `pairId` and `idx` values are used by position-management methods.

### Parameters
- **user** (Address | 'ALL') - Optional - Trader address to scope results to. Pass 'ALL' to fetch open positions across every trader. Defaults to the connected wallet.
- **blockNumber** (bigint) - Optional - Arbitrum block number used for live PnL projection. Defaults to the current block.
- **limit** (number) - Optional - Maximum number of positions to return. Defaults to Infinity.
- **skip** (number) - Optional - Number of positions to skip for pagination. Defaults to 0.

### Response
- **pairPositions** (Array) - List of open positions including pair details, entry price, leverage, and PnL metrics.
- **marginSummary** (Object) - Summary of account value, collateral used, and total PnL.
- **time** (number) - Timestamp of the response.
```

--------------------------------

### Include builder fee

Source: https://docs.ostium.com/developer/reference/get-pairs

Calculates openFee values using a custom builder fee in basis points.

```ts
const { pairs } = await client.getPairs({ builderFeeBps: 20 });
```

--------------------------------

### getAllPrices()

Source: https://docs.ostium.com/developer/reference/get-all-prices

Fetches current mid, bid, and ask prices for all Ostium pairs. This method is ideal for retrieving price quotes without the overhead of the full getPairs payload.

```APIDOC
## getAllPrices()

### Description
Fetches current mid, bid, and ask prices for all Ostium pairs. The response is keyed by `pairId`.

### Method
SDK Method

### Response
- **prices** (Record<string, {ask: string, bid: string, mid: string}>) - A dictionary of price data keyed by pairId.

### Example
```ts
const { prices } = await client.getAllPrices();
console.log(prices['0']);
```
```

--------------------------------

### getPairs

Source: https://docs.ostium.com/developer/reference/get-pairs

Fetches all Ostium pairs along with their associated market metadata, leverage limits, and live price fields.

```APIDOC
## getPairs

### Description
Returns the current list of trading pairs with market metadata and live price fields. This method is used for populating pair pickers, market tables, and discovering pair IDs or leverage limits before executing trades.

### Method
client.getPairs(params?: GetPairsParams)

### Parameters
- **pairIds** (Array<string | number>) - Optional - Filter the returned pairs by specific IDs.
- **builderFeeBps** (number) - Optional - Include a builder fee in the computed openFee values. Defaults to the configured builder.feeBps if omitted.

### Response
- **pairs** (Array<Object>) - A list of pair objects containing:
  - **pairId** (string)
  - **pairTo** (string)
  - **pairFrom** (string)
  - **minSz** (string)
  - **maxBSz** (string)
  - **maxSSz** (string)
  - **minNtl** (string)
  - **maxLeverage** (number)
  - **overnightMaxLeverage** (number)
  - **rolloverFeePerBlock** (string)
  - **openInterest** (string)
  - **buyOpenInterest** (string)
  - **sellOpenInterest** (string)
  - **maxOpenInterest** (string)
  - **category** (string)
  - **rolloverRate** (Object: { long: string, short: string })
  - **midPx** (string)
  - **askPx** (string)
  - **bidPx** (string)
  - **isMarketOpen** (boolean)
  - **isDayTradingClosed** (boolean)
  - **secondsToToggleIsDayTradingClosed** (number)
  - **schedule** (PairSchedule) - Optional
  - **openFee** (number) - Pair taker fee plus builder fee in basis points
  - **closeFee** (number)
```

--------------------------------

### client.openTrade

Source: https://docs.ostium.com/developer/traders/open-market-trade

Opens a new market position on the Ostium platform.

```APIDOC
## client.openTrade

### Description
Opens a market position on Ostium with the Builder SDK.

### Method
SDK Method

### Parameters
- **pairId** (number) - Required - The ID of the trading pair, obtained from getPairs().
- **buy** (boolean) - Required - Set to true for a long position, false for a short position.
- **price** (string) - Required - The current market price.
- **collateral** (string) - Required - The amount of collateral in USD.
- **leverage** (string) - Required - The leverage amount.
- **type** (OrderType) - Required - The order type (e.g., OrderType.Market).
- **takeProfit** (string) - Optional - The take profit price level.
- **stopLoss** (string) - Optional - The stop loss price level.

### Usage Example
```ts
import { OrderType } from '@ostium/builder-sdk';

const result = await client.openTrade({
  pairId: 0,
  buy: true,
  price: '65000',
  collateral: '100',
  leverage: '10',
  type: OrderType.Market,
  takeProfit: '72000',
  stopLoss: '61000',
});
```

### Notes
- Slippage applies to market orders.
- Builder fees apply automatically if configured at client construction.
```

--------------------------------

### Implement Optimistic Open

Source: https://docs.ostium.com/developer/reference/stream-account-updates

Adds an optimistic overlay to the UI immediately after trade submission and reconciles it once the on-chain order ID is available.

```ts
import { extractOrderIdFromReceipt } from '@ostium/builder-sdk';

const result = await client.openTrade(params);
const localId = stream.addOptimisticOpen(params, result);

const receipt = await publicClient.waitForTransactionReceipt({
  hash: result.txHash,
});
const orderId = extractOrderIdFromReceipt(receipt);

if (orderId) {
  stream.attachOrderId(localId, orderId, {
    initiatedTx: result.txHash,
  });
}
```

--------------------------------

### client.openTrade(params)

Source: https://docs.ostium.com/developer/reference/open-trade

Executes a trade on the Ostium platform using the provided parameters.

```APIDOC
## client.openTrade(params)

### Description
Opens a market, limit, or stop trade on the Ostium platform. The method requires specific trade parameters and returns a transaction hash.

### Parameters
- **pairId** (string | number) - Required - The ID of the trading pair, obtained from getPairs().
- **buy** (boolean) - Required - True for a long position, false for a short position.
- **price** (string) - Required - The execution price for the trade.
- **collateral** (string) - Required - The amount of collateral for the trade (minimum 5 USD).
- **leverage** (string) - Required - The leverage multiplier for the trade.
- **type** (OrderType) - Required - The type of order (Market, Limit, or Stop).
- **takeProfit** (string) - Optional - The take profit price level.
- **stopLoss** (string) - Optional - The stop loss price level.
- **slippage** (number) - Optional - Slippage tolerance for market orders.
- **isDayTrade** (boolean) - Optional - Required if leverage exceeds the pair's overnight limit.
- **builder** (object) - Optional - Override builder fee configuration.
  - **address** (string) - Optional - The builder address.
  - **feeBps** (number) - Optional - The builder fee in basis points.

### Response
- **txHash** (string) - The transaction hash of the submitted trade.
- **smartAccountAddress** (string) - Optional - The address of the smart account used for the trade.
```

--------------------------------

### Fetch OHLC candles via SDK

Source: https://docs.ostium.com/developer/builder-api/post-ohlc

Use the SDK to retrieve candles; it automatically handles pagination via the 'sets' parameter.

```typescript
const candles = await client.getCandles({
  pairId: 0,
  from: Date.now() - 30 * 24 * 60 * 60 * 1000,
  resolution: '1D',
  sets: 3,
});
```

--------------------------------

### Fetch and iterate open positions in TypeScript

Source: https://docs.ostium.com/developer/traders/manage-positions

Retrieves current positions and logs key details like pair ID, index, side, and PnL. Requires an initialized client instance.

```ts
const { pairPositions, marginSummary, withdrawable } =
  await client.getOpenPositions();

for (const { position } of pairPositions) {
  console.log(
    position.pairId,
    position.idx,
    position.side,
    position.entryPx,
    position.unrealizedPnl,
    position.liquidationPx,
  );
}

console.log(marginSummary.accountValue, withdrawable);
```

--------------------------------

### client.closeTrade

Source: https://docs.ostium.com/developer/reference/close-trade

Closes a position fully or partially using the Builder SDK.

```APIDOC
## client.closeTrade

### Description
Fully or partially close an Ostium position.

### Parameters
- **pairId** (string) - Required - The identifier for the trading pair.
- **idx** (number) - Required - The index of the position.
- **price** (string) - Required - The price at which to close the trade.
- **closePercent** (number) - Required - The percentage of the position to close (e.g., 100 for full, 50 for partial).

### Response
- **txHash** (string) - The transaction hash of the close operation.
- **smartAccountAddress** (string, optional) - The address of the smart account used.
```

--------------------------------

### streamPrices(pairIds)

Source: https://docs.ostium.com/developer/reference/stream-prices

Initializes a live WebSocket price stream for the specified pair IDs.

```APIDOC
## streamPrices(pairIds)

### Description
Opens a live WebSocket price stream from the Ostium Builder SDK. You can call this method immediately after client creation, and it handles subscription filtering automatically even if metadata is still loading.

### Parameters
- **pairIds** (Array<string | number>) - Required - A list of pair identifiers to subscribe to.

### Methods
- **onSnapshot(handler)**: Registers a callback for the initial snapshot of ticks.
- **onTick(handler)**: Registers a callback for individual price tick updates.
- **subscribe(pairIds)**: Dynamically adds new pairs to the existing stream.
- **unsubscribe(pairIds)**: Dynamically removes pairs from the existing stream.
- **close()**: Closes the WebSocket connection.

### Response Schema (PriceTick)
- **pairId** (string) - Optional - The ID of the trading pair.
- **feedId** (string) - The ID of the price feed.
- **pair** (string) - The trading pair symbol.
- **bid** (number) - The current bid price.
- **mid** (number) - The current mid price.
- **ask** (number) - The current ask price.
- **isMarketOpen** (boolean) - Indicates if the market is currently open.
- **timestampSeconds** (number) - The timestamp of the tick in seconds.
```

--------------------------------

### Fetch and display opening fees in React

Source: https://docs.ostium.com/traders/reference/fees

A React component that fetches market fee data from the Ostium subgraph and renders a formatted table. It includes logic for market name normalization and fee calculation.

```javascript
export const OpeningFeeTable = () => {
  const [rows, setRows] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [expanded, setExpanded] = useState(new Set());
  useEffect(() => {
    let cancelled = false;
    const pairLabel = (from, to) => {
      const raw = `${from}/${to}`;
      const overrides = {
        "CL/USD": "WTI/USD",
        "HG/USD": "XCU/USD",
        "SPX/USD": "US500/USD",
        "NDX/USD": "US100/USD",
        "DJI/USD": "US30/USD",
        "DAX/EUR": "GER40/EUR",
        "FTSE/GBR": "UK100/GBR",
        "HSI/HKD": "HK50/HKD",
        "NIK/JPY": "JP225/JPY"
      };
      return overrides[raw] ?? raw;
    };
    (async () => {
      try {
        const res = await fetch("https://api.subgraph.ormilabs.com/api/public/67a599d5-c8d2-4cc4-9c4d-2975a97bc5d8/subgraphs/ost-prod/live/gn", {
          method: "POST",
          headers: {
            "Content-Type": "application/json"
          },
          body: JSON.stringify({
            query: `query { pairs(first: 100) { takerFeeP from to group { name } } }`
          })
        });
        const json = await res.json();
        if (json.errors?.length) throw new Error(json.errors.map(e => e.message).join("; "));
        if (!cancelled) setRows((json.data?.pairs ?? []).map(p => ({
          market: pairLabel(p.from, p.to),
          group: p.group?.name ?? "other",
          feeBps: parseFloat(p.takerFeeP) / 1e4
        })));
      } catch (e) {
        if (!cancelled) setError(e.message || "Failed to load fees");
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();
    return () => {
      cancelled = true;
    };
  }, []);
  const fmtGroup = name => {
    if (!name) return "Other";
    if (name.toLowerCase() === "etf") return "ETF";
    return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
  };
  const fmtBps = n => {
    if (!Number.isFinite(n)) return "—";
    return `${Math.round(n * 100) / 100} bps`;
  };
  const groups = useMemo(() => {
    const map = new Map();
    for (const r of rows) {
      if (!map.has(r.group)) map.set(r.group, []);
      map.get(r.group).push(r);
    }
    return Array.from(map.entries()).map(([name, pairs]) => {
      const fees = pairs.map(p => p.feeBps).filter(Number.isFinite);
      const minRaw = fees.length ? Math.min(...fees) : null;
      const maxRaw = fees.length ? Math.max(...fees) : null;
      const minR = minRaw != null ? Math.round(minRaw * 100) / 100 : null;
      const maxR = maxRaw != null ? Math.round(maxRaw * 100) / 100 : null;
      const feeRange = minR === maxR ? fmtBps(minRaw) : `${fmtBps(minRaw)} – ${fmtBps(maxRaw)}`;
      return {
        name,
        label: fmtGroup(name),
        pairs: [...pairs].sort((a, b) => a.market.localeCompare(b.market)),
        feeRange
      };
    }).sort((a, b) => a.label.localeCompare(b.label));
  }, [rows]);
  const toggle = name => setExpanded(prev => {
    const next = new Set(prev);
    next.has(name) ? next.delete(name) : next.add(name);
    return next;
  });
  if (error) return <p className="not-prose text-sm text-red-600 dark:text-red-400">{error}</p>;
  const headCell = "px-3 py-2 text-xs font-semibold uppercase tracking-wide text-zinc-500 dark:text-zinc-500";
  const bodyCell = "px-3 py-1.5 text-sm text-zinc-700 dark:text-zinc-300";
  const feeHead = `${headCell} w-[1%] whitespace-nowrap tabular-nums !text-right`;
  const feeBody = `${bodyCell} w-[1%] whitespace-nowrap text-right tabular-nums`;
  return <div className="not-prose w-full overflow-x-auto">
      <table className="w-full min-w-[20rem] border-collapse text-sm">
        <colgroup>
          <col />
          <col className="w-[1%]" />
          <col className="w-[1%]" />
        </colgroup>
        <thead>
          <tr className="border-b border-zinc-950/10 dark:border-white/10">
            <th scope="col" className={`${headCell} text-left`}>
              <span className="flex items-center gap-1">
                <span className="inline-block h-2 w-2 shrink-0" aria-hidden />
                Group / market
              </span>
            </th>
            <th scope="col" className={feeHead}>
              <span className="flex w-full justify-end">Opening</span>
            </th>
            <th scope="col" className={feeHead}>
              <span className="flex w-full justify-end">Closing</span>
            </th>
          </tr>
        </thead>
        <tbody className="divide-y divide-zinc-950/[0.06] dark:divide-white/[0.06]">
          {loading && Array.from({
    length: 6
  }).map((_, i) => <tr key={i}>
                <td className={bodyCell}>
```