Hyperliquid API TypeScript SDK

Unofficial Hyperliquid API SDK for all major JS runtimes, written in TypeScript.

Features

• 🖋️ Typed: Source code is 100% TypeScript.
• 🧪 Tested: Good code coverage and type relevance.
• 📦 Minimal dependencies: A few small trusted dependencies.
• 🌐 Cross-Environment Support: Compatible with all major JS runtimes.
• 🔧 Integratable: Easy to use with wallet providers (viem, ethers, private key directly).
• 📚 Documented: JSDoc annotations with usage examples in source code.

Installation

Note

While this library is in TypeScript, it can also be used in JavaScript and supports ESM/CommonJS.

Node.js (choose your package manager)

npm i @nktkas/hyperliquid

pnpm add @nktkas/hyperliquid

yarn add @nktkas/hyperliquid

Deno

deno add jsr:@nktkas/hyperliquid

Web

<script type="module">
    import * as hl from "https://esm.sh/jsr/@nktkas/hyperliquid";
</script>

React Native

For React Native, you need to import polyfills before importing the SDK:

// React Native 0.76.3 / Expo v52
// Issues:
// - signing: does not support private keys directly, use `viem` or `ethers`

import { Event, EventTarget } from "event-target-shim";

if (!globalThis.EventTarget || !globalThis.Event) {
    globalThis.EventTarget = EventTarget;
    globalThis.Event = Event;
}

if (!globalThis.CustomEvent) {
    globalThis.CustomEvent = function (type, params) {
        params = params || {};
        const event = new Event(type, params);
        event.detail = params.detail || null;
        return event;
    };
}

if (!AbortSignal.timeout) {
    AbortSignal.timeout = function (delay) {
        const controller = new AbortController();
        setTimeout(() => controller.abort(), delay);
        return controller.signal;
    };
}

if (!Promise.withResolvers) {
    Promise.withResolvers = function () {
        let resolve, reject;
        const promise = new Promise((res, rej) => {
            resolve = res;
            reject = rej;
        });
        return { promise, resolve, reject };
    };
}

Quick Start

Info endpoint

// 1. Import module
import * as hl from "@nktkas/hyperliquid";

// 1. Set up client with transport
const infoClient = new hl.InfoClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
});

// 3. Query data
const openOrders = await infoClient.openOrders({ user: "0x..." });

Exchange endpoint

// 1. Import module
import * as hl from "@nktkas/hyperliquid";

// 2. Set up client with wallet and transport
const exchClient = new hl.ExchangeClient({
    wallet: "0x...", // `viem`, `ethers`, or private key directly
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
});

// 3. Execute an action
const result = await exchClient.order({
    orders: [{
        a: 0,
        b: true,
        p: "30000",
        s: "0.1",
        r: false,
        t: {
            limit: {
                tif: "Gtc",
            },
        },
    }],
    grouping: "na",
});

Subscription

// 1. Import module
import * as hl from "@nktkas/hyperliquid";

// 2. Set up client with transport
const subsClient = new hl.SubscriptionClient({
    transport: new hl.WebSocketTransport(),
});

// 3. Subscribe to events
const sub = await subsClient.allMids((event) => {
    console.log(event);
});
await sub.unsubscribe();

Multi-Sign

// 1. Import module
import * as hl from "@nktkas/hyperliquid";

// 2. Set up client with transport, multi-sign address, and signers
const multiSignClient = new hl.MultiSignClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
    multiSignAddress: "0x...",
    signers: [
        "0x...", // `viem`, `ethers`, or private key directly
    ],
});

// 3. Execute an action
const data = await multiSignClient.approveAgent({ agentAddress: "0x..." });

Usage

1) Initialize Transport

First, choose and configure your transport layer (more details in the API Reference):

import * as hl from "@nktkas/hyperliquid";

// 1. HTTP Transport: suitable for one-time requests or serverless environments
const httpTransport = new hl.HttpTransport({...}); // Accepts optional parameters (e.g. isTestnet, timeout, etc.)

// 2. WebSocket Transport: has better network latency than HTTP transport
const wsTransport = new hl.WebSocketTransport({...}); // Accepts optional parameters (e.g. url, timeout, reconnect, etc.)

2) Initialize Client

Next, initialize a client with the transport layer (more details in the API Reference):

Create InfoClient

import * as hl from "@nktkas/hyperliquid";

const infoClient = new hl.InfoClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
});

Create ExchangeClient

import * as hl from "@nktkas/hyperliquid";
import { createWalletClient, custom } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { ethers } from "ethers";

const transport = new hl.HttpTransport(); // or `WebSocketTransport`

// 1. Using private key directly
const privateKey = "0x...";
const exchClient_privateKey = new hl.ExchangeClient({ wallet: privateKey, transport });

// 2. Using Viem
const viemAccount = privateKeyToAccount("0x...");
const exchClient_viem = new hl.ExchangeClient({ wallet: viemAccount, transport });

// 3. Using Ethers (V5 or V6)
const ethersWallet = new ethers.Wallet("0x...");
const exchClient_ethers = new hl.ExchangeClient({ wallet: ethersWallet, transport });

// 4. Using external wallet (e.g. MetaMask) via Viem
const [account] = await window.ethereum.request({ method: "eth_requestAccounts" });
const externalWallet = createWalletClient({ account, transport: custom(window.ethereum) });
const exchClient_viemMetamask = new hl.ExchangeClient({ wallet: externalWallet, transport });

Create SubscriptionClient

import * as hl from "@nktkas/hyperliquid";

const subsClient = new hl.SubscriptionClient({
    transport: new hl.WebSocketTransport(),
});

Create MultiSignClient

import * as hl from "@nktkas/hyperliquid";
import { privateKeyToAccount } from "viem/accounts";
import { ethers } from "ethers";

const multiSignClient = new hl.MultiSignClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
    multiSignAddress: "0x...",
    signers: [
        privateKeyToAccount("0x..."), // first is leader for multi-sign transaction (signs transaction 2 times)
        new ethers.Wallet("0x..."),
        { // can be a custom async wallet
            async signTypedData(params: {
                domain: {
                    name: string;
                    version: string;
                    chainId: number;
                    verifyingContract: `0x${string}`;
                };
                types: {
                    [key: string]: {
                        name: string;
                        type: string;
                    }[];
                };
                primaryType: string;
                message: Record<string, unknown>;
            }): Promise<`0x${string}`> {
                // Custom signer logic
                return "0x..."; // return hex signature
            },
        },
        "0x...", // private key directly
    ],
});

3) Use Client

Finally, use client methods to interact with the Hyperliquid API (more details in the API Reference):

Example of using an InfoClient

import * as hl from "@nktkas/hyperliquid";

const infoClient = new hl.InfoClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
});

// L2 Book
const l2Book = await infoClient.l2Book({ coin: "BTC" });

// Account clearinghouse state
const clearinghouseState = await infoClient.clearinghouseState({ user: "0x..." });

// Open orders
const openOrders = await infoClient.openOrders({ user: "0x..." });

Example of using an ExchangeClient

import * as hl from "@nktkas/hyperliquid";

const exchClient = new hl.ExchangeClient({
    wallet: "0x...", // `viem`, `ethers`, or private key directly
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
});

// Place an orders
const result = await exchClient.order({
    orders: [{
        a: 0,
        b: true,
        p: "30000",
        s: "0.1",
        r: false,
        t: {
            limit: {
                tif: "Gtc",
            },
        },
    }],
    grouping: "na",
});

// Approve an agent
const result = await exchClient.approveAgent({ agentAddress: "0x..." });

// Withdraw funds
const result = await exchClient.withdraw3({ destination: "0x...", amount: "100" });

Example of using a SubscriptionClient

import * as hl from "@nktkas/hyperliquid";

const subsClient = new hl.SubscriptionClient({
    transport: new hl.WebSocketTransport(),
});

// L2 Book updates
await subsClient.l2Book({ coin: "BTC" }, (data) => {
    console.log(data);
});

// User fills
await subsClient.userFills({ user: "0x..." }, (data) => {
    console.log(data);
});

// Candle updates
await subsClient.candle({ coin: "BTC", interval: "1h" }, (data) => {
    console.log(data);
});

Example of using a MultiSignClient

import * as hl from "@nktkas/hyperliquid";

const multiSignClient = new hl.MultiSignClient({
    transport: new hl.HttpTransport(), // or `WebSocketTransport`
    multiSignAddress: "0x...",
    signers: [
        "0x...", // `viem`, `ethers`, or private key directly
    ],
});

// Interaction is the same as with `ExchangeClient`

API Reference

Clients

A client is an interface through which you can interact with the Hyperliquid API.

InfoClient

class InfoClient {
    constructor(args: {
        transport: HttpTransport | WebSocketTransport;
    });

    // Market
    allMids(): Promise<AllMids>;
    candleSnapshot(args: CandleSnapshotParameters): Promise<Candle[]>;
    fundingHistory(args: FundingHistoryParameters): Promise<FundingHistory[]>;
    l2Book(args: L2BookParameters): Promise<Book>;
    liquidatable(): Promise<unknown[]>;
    marginTable(args: MarginTableParameters): Promise<MarginTable>;
    maxMarketOrderNtls(): Promise<[number, string][]>;
    meta(): Promise<PerpsMeta>;
    metaAndAssetCtxs(): Promise<PerpsMetaAndAssetCtxs>;
    perpDeployAuctionStatus(): Promise<DeployAuctionStatus>;
    perpDexs(): Promise<(PerpDex | null)[]>;
    perpsAtOpenInterestCap(): Promise<string[]>;
    predictedFundings(): Promise<PredictedFunding[]>;
    spotDeployState(args: SpotDeployStateParameters): Promise<SpotDeployState>;
    spotMeta(): Promise<SpotMeta>;
    spotMetaAndAssetCtxs(): Promise<SpotMetaAndAssetCtxs>;
    tokenDetails(args: TokenDetailsParameters): Promise<TokenDetails>;

    // Account
    clearinghouseState(args: ClearinghouseStateParameters): Promise<PerpsClearinghouseState>;
    extraAgents(args: ExtraAgentsParameters): Promise<ExtraAgent[]>;
    isVip(args: IsVipParameters): Promise<boolean>;
    legalCheck(args: LegalCheckParameters): Promise<LegalCheck>;
    maxBuilderFee(args: MaxBuilderFeeParameters): Promise<number>;
    portfolio(args: PortfolioParameters): Promise<PortfolioPeriods>;
    preTransferCheck(args: PreTransferCheckParameters): Promise<PreTransferCheck>;
    referral(args: ReferralParameters): Promise<Referral>;
    spotClearinghouseState(args: SpotClearinghouseStateParameters): Promise<SpotClearinghouseState>;
    subAccounts(args: SubAccountsParameters): Promise<SubAccount[] | null>;
    userFees(args: UserFeesParameters): Promise<UserFees>;
    userFunding(args: UserFundingParameters): Promise<UserFundingUpdate[]>;
    userNonFundingLedgerUpdates(args: UserNonFundingLedgerUpdatesParameters): Promise<UserNonFundingLedgerUpdate[]>;
    userRateLimit(args: UserRateLimitParameters): Promise<UserRateLimit>;
    userRole(args: UserRoleParameters): Promise<UserRole>;
    userToMultiSigSigners(args: UserToMultiSigSignersParameters): Promise<MultiSigSigners | null>;

    // Order
    frontendOpenOrders(args: FrontendOpenOrdersParameters): Promise<FrontendOrder[]>;
    historicalOrders(args: HistoricalOrdersParameters): Promise<OrderStatus<FrontendOrder>[]>;
    openOrders(args: OpenOrdersParameters): Promise<Order[]>;
    orderStatus(args: OrderStatusParameters): Promise<OrderLookup>;
    twapHistory(args: TwapHistoryParameters): Promise<TwapHistory[]>;
    userFills(args: UserFillsParameters): Promise<Fill[]>;
    userFillsByTime(args: UserFillsByTimeParameters): Promise<Fill[]>;
    userTwapSliceFills(args: UserTwapSliceFillsParameters): Promise<TwapSliceFill[]>;
    userTwapSliceFillsByTime(args: UserTwapSliceFillsByTimeParameters): Promise<TwapSliceFill[]>;

    // Validator
    delegations(args: DelegationsParameters): Promise<Delegation[]>;
    delegatorHistory(args: DelegatorHistoryParameters): Promise<DelegatorUpdate[]>;
    delegatorRewards(args: DelegatorRewardsParameters): Promise<DelegatorReward[]>;
    delegatorSummary(args: DelegatorSummaryParameters): Promise<DelegatorSummary>;
    validatorL1Votes(): Promise<unknown[]>;
    validatorSummaries(): Promise<ValidatorSummary[]>;

    // Vault
    leadingVaults(args: LeadingVaultsParameters): Promise<VaultLeading[]>;
    userVaultEquities(args: UserVaultEquitiesParameters): Promise<VaultEquity[]>;
    vaultDetails(args: VaultDetailsParameters): Promise<VaultDetails | null>;
    vaultSummaries(): Promise<VaultSummary[]>;

    // Server
    exchangeStatus(): Promise<ExchangeStatus>;

    // Explorer (RPC endpoint)
    blockDetails(args: BlockDetailsParameters): Promise<BlockDetails>;
    txDetails(args: TxDetailsParameters): Promise<TxDetails>;
    userDetails(args: UserDetailsParameters): Promise<TxDetails[]>;
}

ExchangeClient

class ExchangeClient {
    constructor(args: {
        transport: HttpTransport | WebSocketTransport;
        wallet: AbstractWallet; // `viem`, `ethers` (v5 or v6), or private key directly
        isTestnet?: boolean; // Whether to use testnet (default: false)
        defaultVaultAddress?: `0x${string}`; // Vault address used by default if not provided in method call
        signatureChainId?: `0x${string}` | (() => MaybePromise<`0x${string}`>); // Chain ID used for signing (default: get chain id from wallet otherwise `0x1`)
        nonceManager?: () => MaybePromise<number>; // Function to get the next nonce (default: monotonically incrementing `Date.now()`)
    });

    // Order
    batchModify(args: BatchModifyParameters): Promise<OrderResponseSuccess>;
    cancel(args: CancelParameters): Promise<CancelResponseSuccess>;
    cancelByCloid(args: CancelByCloidParameters): Promise<CancelResponseSuccess>;
    modify(args: ModifyParameters): Promise<SuccessResponse>;
    order(args: OrderParameters): Promise<OrderResponseSuccess>;
    scheduleCancel(args?: ScheduleCancelParameters): Promise<SuccessResponse>;
    twapCancel(args: TwapCancelParameters): Promise<TwapCancelResponseSuccess>;
    twapOrder(args: TwapOrderParameters): Promise<TwapOrderResponseSuccess>;
    updateIsolatedMargin(args: UpdateIsolatedMarginParameters): Promise<SuccessResponse>;
    updateLeverage(args: UpdateLeverageParameters): Promise<SuccessResponse>;

    // Account
    approveAgent(args: ApproveAgentParameters): Promise<SuccessResponse>;
    approveBuilderFee(args: ApproveBuilderFeeParameters): Promise<SuccessResponse>;
    claimRewards(): Promise<SuccessResponse>;
    createSubAccount(args: CreateSubAccountParameters): Promise<CreateSubAccountResponse>;
    evmUserModify(args: EvmUserModifyParameters): Promise<SuccessResponse>;
    registerReferrer(args: RegisterReferrerParameters): Promise<SuccessResponse>;
    reserveRequestWeight(args: ReserveRequestWeightParameters): Promise<SuccessResponse>;
    setDisplayName(args: SetDisplayNameParameters): Promise<SuccessResponse>;
    setReferrer(args: SetReferrerParameters): Promise<SuccessResponse>;
    subAccountModify(args: SubAccountModifyParameters): Promise<SuccessResponse>;
    spotUser(args: SpotUserParameters): Promise<SuccessResponse>;

    // Transfer
    spotSend(args: SpotSendParameters): Promise<SuccessResponse>;
    subAccountSpotTransfer(args: SubAccountSpotTransferParameters): Promise<SuccessResponse>;
    subAccountTransfer(args: SubAccountTransferParameters): Promise<SuccessResponse>;
    usdClassTransfer(args: UsdClassTransferParameters): Promise<SuccessResponse>;
    usdSend(args: UsdSendParameters): Promise<SuccessResponse>;
    withdraw3(args: Withdraw3Parameters): Promise<SuccessResponse>;

    // Staking
    cDeposit(args: CDepositParameters): Promise<SuccessResponse>;
    cWithdraw(args: CWithdrawParameters): Promise<SuccessResponse>;
    tokenDelegate(args: TokenDelegateParameters): Promise<SuccessResponse>;

    // Market
    perpDeploy(args: PerpDeployParameters): Promise<SuccessResponse>;
    spotDeploy(args: SpotDeployParameters): Promise<SuccessResponse>;

    // Vault
    createVault(args: CreateVaultParameters): Promise<CreateVaultResponse>;
    vaultDistribute(args: VaultDistributeParameters): Promise<SuccessResponse>;
    vaultModify(args: VaultModifyParameters): Promise<SuccessResponse>;
    vaultTransfer(args: VaultTransferParameters): Promise<SuccessResponse>;

    // Multi-Sign
    convertToMultiSigUser(args: ConvertToMultiSigUserParameters): Promise<SuccessResponse>;
    multiSig(args: MultiSigParameters): Promise<BaseExchangeResponse>;

    // Validator
    cSignerAction(args: CSignerActionParameters): Promise<SuccessResponse>;
    cValidatorAction(args: CValidatorActionParameters): Promise<SuccessResponse>;
}

SubscriptionClient

class SubscriptionClient {
    constructor(args: {
        transport: WebSocketTransport;
    });

    // Market
    activeAssetCtx(args: EventActiveAssetCtxParameters, listener: (data: WsActiveAssetCtx | WsActiveSpotAssetCtx) => void): Promise<Subscription>;
    activeAssetData(args: EventActiveAssetDataParameters, listener: (data: ActiveAssetData) => void): Promise<Subscription>;
    allMids(listener: (data: WsAllMids) => void): Promise<Subscription>;
    bbo(args: EventBboParameters, listener: (data: WsBbo) => void): Promise<Subscription>;
    candle(args: EventCandleParameters, listener: (data: Candle) => void): Promise<Subscription>;
    l2Book(args: EventL2BookParameters, listener: (data: Book) => void): Promise<Subscription>;
    trades(args: EventTradesParameters, listener: (data: WsTrade[]) => void): Promise<Subscription>;

    // Account
    notification(args: EventNotificationParameters, listener: (data: WsNotification) => void): Promise<Subscription>;
    userEvents(args: EventUserEventsParameters, listener: (data: WsUserEvent) => void): Promise<Subscription>;
    userFundings(args: EventUserFundingsParameters, listener: (data: WsUserFundings) => void): Promise<Subscription>;
    userNonFundingLedgerUpdates(args: EventUserNonFundingLedgerUpdatesParameters, listener: (data: WsUserNonFundingLedgerUpdates) => void): Promise<Subscription>;
    webData2(args: EventWebData2Parameters, listener: (data: WsWebData2) => void): Promise<Subscription>;

    // Order
    orderUpdates(args: EventOrderUpdatesParameters, listener: (data: OrderStatus<Order>[]) => void): Promise<Subscription>;
    userFills(args: EventUserFillsParameters, listener: (data: WsUserFills) => void): Promise<Subscription>;
    userTwapHistory(args: EventUserTwapHistory, listener: (data: WsUserTwapHistory) => void): Promise<Subscription>;
    userTwapSliceFills(args: EventUserTwapSliceFills, listener: (data: WsUserTwapSliceFills) => void): Promise<Subscription>;

    // Explorer (RPC endpoint)
    explorerBlock(listener: (data: WsBlockDetails[]) => void): Promise<Subscription>;
    explorerTxs(listener: (data: TxDetails[]) => void): Promise<Subscription>;
}

MultiSignClient

class MultiSignClient extends ExchangeClient {
    constructor(
        args:
            & Omit<ExchangeClientParameters, "wallet"> // instead of `wallet`, you should specify the following parameters:
            & {
                multiSignAddress: `0x${string}`;
                signers: [AbstractWallet, ...AbstractWallet[]];
            },
    );

    // Same methods as `ExchangeClient`
}

Transports

Transport acts as a layer between class requests and Hyperliquid servers.

HTTP Transport

Features:

• Uses fetch for requests. Can be configured using fetchOptions.
• Automatically determines the target URL based on the request + isTestnet flag.

class HttpTransport {
    constructor(options?: {
        isTestnet?: boolean; // Whether to use testnet url (default: false)
        timeout?: number; // Request timeout in ms (default: 10_000)
        server?: { // Custom server URLs
            mainnet?: { api?: string | URL; rpc?: string | URL };
            testnet?: { api?: string | URL; rpc?: string | URL };
        };
        fetchOptions?: RequestInit; // A custom fetch options
        onRequest?: (request: Request) => MaybePromise<Request | void | null | undefined>; // A callback before request is sent
        onResponse?: (response: Response) => MaybePromise<Response | void | null | undefined>; // A callback after response is received
    });
}

WebSocket Transport

Features:

• Uses WebSocket for requests.
• Supports subscriptions and post requests.
• Automatically restores connection after loss and resubscribes to previous subscriptions.
• Smart keep alive (pings only when idle).
• Lazy initialization with message buffering during connection establishment.

Limitations:

• Cannot mix api/explorer endpoints or mainnet/testnet in single connection. Need to create separate instances for different endpoints.
• Cannot send explorer post-requests via WebSocket. Use HTTP transport.

class WebSocketTransport {
    constructor(options?: {
        url?: string | URL; // WebSocket URL (default: "wss://api.hyperliquid.xyz/ws")
        timeout?: number; // Request timeout in ms (default: 10_000)
        keepAlive?: {
            interval?: number; // Ping interval in ms (default: 30_000)
            timeout?: number; // Pong timeout in ms (default: same as `timeout` for requests)
        };
        reconnect?: {
            maxRetries?: number; // Maximum number of reconnection attempts (default: 3)
            connectionTimeout?: number; // Connection timeout in ms (default: 10_000)
            connectionDelay?: number | ((attempt: number) => number | Promise<number>); // Delay between reconnection (default: Exponential backoff (max 10s))
            shouldReconnect?: (event: CloseEvent) => boolean | Promise<boolean>; // Custom reconnection logic (default: Always reconnect)
            messageBuffer?: MessageBufferStrategy; // Message buffering strategy between reconnection (default: FIFO buffer)
        };
        autoResubscribe?: boolean; // Whether to automatically resubscribe to events after reconnection (default: true)
    });
    ready(signal?: AbortSignal): Promise<void>;
    close(signal?: AbortSignal): Promise<void>;
}

Additional Import Points

/types

The import point gives access to all Hyperliquid-related types, including the base types on which class methods are based.

/signing

The import point gives access to functions that generate signatures for Hyperliquid transactions.

Examples

Cancel order yourself

import { actionSorter, signL1Action } from "@nktkas/hyperliquid/signing";

const privateKey = "0x..."; // `viem`, `ethers`, or private key directly

const action = actionSorter.cancel({
    type: "cancel",
    cancels: [
        { a: 0, o: 12345 },
    ],
});
const nonce = Date.now();

const signature = await signL1Action({ wallet: privateKey, action, nonce });

// Send the signed action to the Hyperliquid API
const response = await fetch("https://api.hyperliquid.xyz/exchange", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ action, signature, nonce }), // recommended to send the same formatted action
});
const body = await response.json();

Approve agent yourself

import { actionSorter, signUserSignedAction, userSignedActionEip712Types } from "@nktkas/hyperliquid/signing";

const privateKey = "0x..."; // `viem`, `ethers`, or private key directly

const action = actionSorter.approveAgent({
    type: "approveAgent",
    signatureChainId: "0x66eee",
    hyperliquidChain: "Mainnet",
    agentAddress: "0x...",
    agentName: "Agent",
    nonce: Date.now(),
});

const signature = await signUserSignedAction({
    wallet: privateKey,
    action,
    types: userSignedActionEip712Types[action.type],
});

// Send the signed action to the Hyperliquid API
const response = await fetch("https://api.hyperliquid.xyz/exchange", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ action, signature, nonce: action.nonce }), // recommended to send the same formatted action
});
const body = await response.json();

FAQ

How to execute an L1 action via an external wallet (e.g. MetaMask)?

Hyperliquid requires chain 1337 for L1 actions (open order, change leverage, etc.). There are two ways to execute an L1 action through an external wallet:

• (recommended) Create an Agent Wallet and execute all L1 actions through it
• Change the user's chain to 1337, however, the user will sign unreadable data

How to create a market order?

Hyperliquid doesn't have traditional market orders, but you can achieve market-like execution by placing limit order with tif: "Ioc" and price that guarantee immediate execution:

• For buys: set limit price >= current best ask
• For sells: set limit price <= current best bid

How to use the Agent Wallet / Vault / Sub-Account in ExchangeClient?

Agent Wallet: Use agent's private key in constructor instead of master account's private key.

Vault and Sub-Account: Pass vault or sub-account address via vaultAddress options to methods or set defaultVaultAddress in constructor.

Contributing

We appreciate your help! To contribute, please read the contributing instructions.