Hyperliquid WebSocket API

asyncapi: '2.6.0'
info:
  title: Hyperliquid WebSocket API
  version: '1.0.0'
  description: >-
    AsyncAPI 2.6 specification for the Hyperliquid public WebSocket API.
    Clients connect to wss://api.hyperliquid.xyz/ws (mainnet) or
    wss://api.hyperliquid-testnet.xyz/ws (testnet) and send subscribe /
    unsubscribe messages to receive real-time market data, order book updates,
    trades, candles, and user-specific events (orders, fills, fundings).
    The same WebSocket also supports `post` messages to invoke REST-style info
    and action requests with correlated responses.
  contact:
    name: Hyperliquid
    url: https://hyperliquid.gitbook.io/hyperliquid-docs/for-developers/api/websocket
  license:
    name: MIT

servers:
  mainnet:
    url: api.hyperliquid.xyz/ws
    protocol: wss
    description: Hyperliquid mainnet WebSocket endpoint
  testnet:
    url: api.hyperliquid-testnet.xyz/ws
    protocol: wss
    description: Hyperliquid testnet WebSocket endpoint

defaultContentType: application/json

channels:
  /:
    description: >-
      Single WebSocket channel for all Hyperliquid subscriptions and
      post-requests. Clients publish subscribe/unsubscribe/post messages and
      receive subscriptionResponse, post, and per-feed data messages.
    publish:
      summary: Messages sent by the client to the server.
      operationId: clientSend
      message:
        oneOf:
          - $ref: '#/components/messages/SubscribeMessage'
          - $ref: '#/components/messages/UnsubscribeMessage'
          - $ref: '#/components/messages/PostRequest'
    subscribe:
      summary: Messages received by the client from the server.
      operationId: clientReceive
      message:
        oneOf:
          - $ref: '#/components/messages/SubscriptionResponse'
          - $ref: '#/components/messages/PostResponse'
          - $ref: '#/components/messages/AllMidsData'
          - $ref: '#/components/messages/NotificationData'
          - $ref: '#/components/messages/WebData2Data'
          - $ref: '#/components/messages/CandleData'
          - $ref: '#/components/messages/L2BookData'
          - $ref: '#/components/messages/TradesData'
          - $ref: '#/components/messages/BboData'
          - $ref: '#/components/messages/OrderUpdatesData'
          - $ref: '#/components/messages/UserEventsData'
          - $ref: '#/components/messages/UserFillsData'
          - $ref: '#/components/messages/UserFundingsData'
          - $ref: '#/components/messages/UserNonFundingLedgerUpdatesData'
          - $ref: '#/components/messages/ActiveAssetCtxData'
          - $ref: '#/components/messages/ActiveAssetDataData'
          - $ref: '#/components/messages/UserTwapSliceFillsData'
          - $ref: '#/components/messages/UserTwapHistoryData'
          - $ref: '#/components/messages/PongMessage'

components:
  messages:
    SubscribeMessage:
      name: subscribe
      title: Subscribe
      summary: Subscribe to a Hyperliquid feed.
      payload:
        type: object
        required: [method, subscription]
        properties:
          method:
            type: string
            const: subscribe
          subscription:
            $ref: '#/components/schemas/Subscription'

    UnsubscribeMessage:
      name: unsubscribe
      title: Unsubscribe
      summary: Unsubscribe from a previously subscribed feed.
      payload:
        type: object
        required: [method, subscription]
        properties:
          method:
            type: string
            const: unsubscribe
          subscription:
            $ref: '#/components/schemas/Subscription'

    PostRequest:
      name: post
      title: Post Request
      summary: >-
        Send a REST-style info or action request over the WebSocket. The
        response is delivered on the `post` channel with the same `id`.
      payload:
        type: object
        required: [method, id, request]
        properties:
          method:
            type: string
            const: post
          id:
            type: integer
            description: Client-supplied correlation id.
          request:
            type: object
            required: [type, payload]
            properties:
              type:
                type: string
                enum: [info, action]
              payload:
                type: object

    SubscriptionResponse:
      name: subscriptionResponse
      title: Subscription Response
      summary: Acknowledgement of a subscribe/unsubscribe request.
      payload:
        type: object
        properties:
          channel:
            type: string
            const: subscriptionResponse
          data:
            type: object
            properties:
              method:
                type: string
                enum: [subscribe, unsubscribe]
              subscription:
                $ref: '#/components/schemas/Subscription'

    PostResponse:
      name: postResponse
      title: Post Response
      payload:
        type: object
        properties:
          channel:
            type: string
            const: post
          data:
            type: object
            properties:
              id:
                type: integer
              response:
                type: object
                properties:
                  type:
                    type: string
                    enum: [info, action, error]
                  payload:
                    oneOf:
                      - type: object
                      - type: string

    PongMessage:
      name: pong
      title: Pong
      summary: Server keep-alive response to a client `ping`.
      payload:
        type: object
        properties:
          channel:
            type: string
            const: pong

    AllMidsData:
      name: allMids
      payload:
        type: object
        properties:
          channel:
            type: string
            const: allMids
          data:
            type: object
            properties:
              mids:
                type: object
                additionalProperties:
                  type: string
                description: Map of coin symbol to mid price string.

    NotificationData:
      name: notification
      payload:
        type: object
        properties:
          channel:
            type: string
            const: notification
          data:
            type: object
            properties:
              notification:
                type: string

    WebData2Data:
      name: webData2
      payload:
        type: object
        properties:
          channel:
            type: string
            const: webData2
          data:
            type: object
            description: >-
              Aggregated user view used by the Hyperliquid web app, including
              user state, perp dex states, vault equities, and leading vaults.

    CandleData:
      name: candle
      payload:
        type: object
        properties:
          channel:
            type: string
            const: candle
          data:
            $ref: '#/components/schemas/Candle'

    L2BookData:
      name: l2Book
      payload:
        type: object
        properties:
          channel:
            type: string
            const: l2Book
          data:
            $ref: '#/components/schemas/WsBook'

    TradesData:
      name: trades
      payload:
        type: object
        properties:
          channel:
            type: string
            const: trades
          data:
            type: array
            items:
              $ref: '#/components/schemas/WsTrade'

    BboData:
      name: bbo
      payload:
        type: object
        properties:
          channel:
            type: string
            const: bbo
          data:
            type: object
            properties:
              coin:
                type: string
              time:
                type: integer
              bbo:
                type: array
                minItems: 2
                maxItems: 2
                items:
                  oneOf:
                    - $ref: '#/components/schemas/WsLevel'
                    - type: 'null'

    OrderUpdatesData:
      name: orderUpdates
      payload:
        type: object
        properties:
          channel:
            type: string
            const: orderUpdates
          data:
            type: array
            items:
              $ref: '#/components/schemas/WsOrder'

    UserEventsData:
      name: user
      summary: >-
        User events. Note: while the subscription `type` is `userEvents`, the
        channel field on incoming messages is `user`.
      payload:
        type: object
        properties:
          channel:
            type: string
            const: user
          data:
            type: object
            description: >-
              One of fills, funding, liquidation, or nonUserCancel events for
              the subscribed user.

    UserFillsData:
      name: userFills
      payload:
        type: object
        properties:
          channel:
            type: string
            const: userFills
          data:
            type: object
            properties:
              isSnapshot:
                type: boolean
              user:
                type: string
              fills:
                type: array
                items:
                  $ref: '#/components/schemas/WsFill'

    UserFundingsData:
      name: userFundings
      payload:
        type: object
        properties:
          channel:
            type: string
            const: userFundings
          data:
            type: object
            properties:
              isSnapshot:
                type: boolean
              user:
                type: string
              fundings:
                type: array
                items:
                  type: object

    UserNonFundingLedgerUpdatesData:
      name: userNonFundingLedgerUpdates
      payload:
        type: object
        properties:
          channel:
            type: string
            const: userNonFundingLedgerUpdates
          data:
            type: object
            properties:
              isSnapshot:
                type: boolean
              user:
                type: string
              nonFundingLedgerUpdates:
                type: array
                items:
                  type: object

    ActiveAssetCtxData:
      name: activeAssetCtx
      payload:
        type: object
        properties:
          channel:
            type: string
            enum: [activeAssetCtx, activeSpotAssetCtx]
          data:
            type: object
            properties:
              coin:
                type: string
              ctx:
                type: object
                description: Perp or spot asset context (mark price, oracle, funding, etc.).

    ActiveAssetDataData:
      name: activeAssetData
      payload:
        type: object
        properties:
          channel:
            type: string
            const: activeAssetData
          data:
            type: object
            properties:
              user:
                type: string
              coin:
                type: string
              leverage:
                type: object
              maxTradeSzs:
                type: array
                items:
                  type: string
              availableToTrade:
                type: array
                items:
                  type: string

    UserTwapSliceFillsData:
      name: userTwapSliceFills
      payload:
        type: object
        properties:
          channel:
            type: string
            const: userTwapSliceFills
          data:
            type: object
            properties:
              isSnapshot:
                type: boolean
              user:
                type: string
              twapSliceFills:
                type: array
                items:
                  type: object
                  properties:
                    fill:
                      $ref: '#/components/schemas/WsFill'
                    twapId:
                      type: integer

    UserTwapHistoryData:
      name: userTwapHistory
      payload:
        type: object
        properties:
          channel:
            type: string
            const: userTwapHistory
          data:
            type: object
            properties:
              isSnapshot:
                type: boolean
              user:
                type: string
              history:
                type: array
                items:
                  type: object
                  properties:
                    state:
                      type: object
                    status:
                      type: object
                    time:
                      type: integer

  schemas:
    Subscription:
      oneOf:
        - $ref: '#/components/schemas/SubAllMids'
        - $ref: '#/components/schemas/SubNotification'
        - $ref: '#/components/schemas/SubWebData2'
        - $ref: '#/components/schemas/SubCandle'
        - $ref: '#/components/schemas/SubL2Book'
        - $ref: '#/components/schemas/SubTrades'
        - $ref: '#/components/schemas/SubBbo'
        - $ref: '#/components/schemas/SubOrderUpdates'
        - $ref: '#/components/schemas/SubUserEvents'
        - $ref: '#/components/schemas/SubUserFills'
        - $ref: '#/components/schemas/SubUserFundings'
        - $ref: '#/components/schemas/SubUserNonFundingLedgerUpdates'
        - $ref: '#/components/schemas/SubActiveAssetCtx'
        - $ref: '#/components/schemas/SubActiveAssetData'
        - $ref: '#/components/schemas/SubUserTwapSliceFills'
        - $ref: '#/components/schemas/SubUserTwapHistory'

    SubAllMids:
      type: object
      required: [type]
      properties:
        type:
          type: string
          const: allMids
        dex:
          type: string
          description: Optional perp dex name; defaults to the first perp dex.

    SubNotification:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: notification
        user:
          type: string

    SubWebData2:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: webData2
        user:
          type: string

    SubCandle:
      type: object
      required: [type, coin, interval]
      properties:
        type:
          type: string
          const: candle
        coin:
          type: string
        interval:
          type: string
          enum: ['1m','3m','5m','15m','30m','1h','2h','4h','8h','12h','1d','3d','1w','1M']

    SubL2Book:
      type: object
      required: [type, coin]
      properties:
        type:
          type: string
          const: l2Book
        coin:
          type: string
        nSigFigs:
          type: integer
          nullable: true
        mantissa:
          type: integer
          nullable: true

    SubTrades:
      type: object
      required: [type, coin]
      properties:
        type:
          type: string
          const: trades
        coin:
          type: string

    SubBbo:
      type: object
      required: [type, coin]
      properties:
        type:
          type: string
          const: bbo
        coin:
          type: string

    SubOrderUpdates:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: orderUpdates
        user:
          type: string

    SubUserEvents:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userEvents
        user:
          type: string

    SubUserFills:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userFills
        user:
          type: string
        aggregateByTime:
          type: boolean

    SubUserFundings:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userFundings
        user:
          type: string

    SubUserNonFundingLedgerUpdates:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userNonFundingLedgerUpdates
        user:
          type: string

    SubActiveAssetCtx:
      type: object
      required: [type, coin]
      properties:
        type:
          type: string
          const: activeAssetCtx
        coin:
          type: string

    SubActiveAssetData:
      type: object
      required: [type, user, coin]
      properties:
        type:
          type: string
          const: activeAssetData
        user:
          type: string
        coin:
          type: string

    SubUserTwapSliceFills:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userTwapSliceFills
        user:
          type: string

    SubUserTwapHistory:
      type: object
      required: [type, user]
      properties:
        type:
          type: string
          const: userTwapHistory
        user:
          type: string

    WsLevel:
      type: object
      properties:
        px:
          type: string
        sz:
          type: string
        n:
          type: integer

    WsBook:
      type: object
      properties:
        coin:
          type: string
        levels:
          type: array
          minItems: 2
          maxItems: 2
          items:
            type: array
            items:
              $ref: '#/components/schemas/WsLevel'
        time:
          type: integer

    WsTrade:
      type: object
      properties:
        coin:
          type: string
        side:
          type: string
          enum: ['A', 'B']
        px:
          type: string
        sz:
          type: string
        hash:
          type: string
        time:
          type: integer
        tid:
          type: integer
        users:
          type: array
          items:
            type: string

    WsOrder:
      type: object
      properties:
        order:
          type: object
        status:
          type: string
        statusTimestamp:
          type: integer

    WsFill:
      type: object
      properties:
        coin:
          type: string
        px:
          type: string
        sz:
          type: string
        side:
          type: string
        time:
          type: integer
        startPosition:
          type: string
        dir:
          type: string
        closedPnl:
          type: string
        hash:
          type: string
        oid:
          type: integer
        crossed:
          type: boolean
        fee:
          type: string
        tid:
          type: integer
        liquidation:
          type: object
          nullable: true
        feeToken:
          type: string
        builderFee:
          type: string
          nullable: true

    Candle:
      type: object
      properties:
        t:
          type: integer
          description: Open time (ms).
        T:
          type: integer
          description: Close time (ms).
        s:
          type: string
          description: Coin symbol.
        i:
          type: string
          description: Interval.
        o:
          type: string
        c:
          type: string
        h:
          type: string
        l:
          type: string
        v:
          type: string
          description: Volume.
        n:
          type: integer
          description: Number of trades.