Helius WebSocket APIs

asyncapi: '2.6.0'
id: 'urn:helius:websockets'
info:
  title: Helius WebSocket APIs
  version: '2026-05-29'
  description: |
    AsyncAPI 2.6 description of Helius's real-time WebSocket interfaces for Solana.

    Coverage:
      * Standard Solana JSON-RPC PubSub subscriptions exposed by Helius RPC.
      * Helius enhanced subscriptions (transactionSubscribe, enhanced accountSubscribe).
      * LaserStream WebSocket (same wire protocol as standard Helius WS; runs on the
        same infrastructure and exposes the standard Solana subscription methods plus
        Helius-specific extensions, with lower latency).

    Out of scope (not modeled here):
      * LaserStream gRPC (Yellowstone-compatible). gRPC is not a transport supported
        by AsyncAPI 2.6; use the official LaserStream gRPC protobuf definitions.
      * Webhooks (REST/HTTP push) — see Helius Webhooks REST API.

    Notes on stability (per Helius LaserStream WS docs as of 2026-05-29):
      * Unsupported / unstable on LaserStream WS: blockSubscribe / blockUnsubscribe,
        slotsUpdatesSubscribe / slotsUpdatesUnsubscribe, voteSubscribe / voteUnsubscribe.
        These remain reachable on standard Helius RPC WS endpoints.
  contact:
    name: Helius Developer Support
    url: https://www.helius.dev/docs
  license:
    name: Proprietary (Helius Terms)
    url: https://www.helius.dev/terms
  termsOfService: https://www.helius.dev/terms
  tags:
    - name: Solana
    - name: WebSocket
    - name: JSON-RPC
    - name: PubSub
    - name: Helius

defaultContentType: application/json

servers:
  mainnet:
    url: 'mainnet.helius-rpc.com/?api-key={apiKey}'
    protocol: wss
    description: |
      Helius Solana mainnet WebSocket endpoint. Exposes both standard Solana
      JSON-RPC PubSub subscriptions and Helius enhanced subscriptions
      (transactionSubscribe, enhanced accountSubscribe).
    variables:
      apiKey:
        description: Helius API key provisioned from the Helius dashboard.
        default: YOUR_API_KEY
    bindings:
      ws:
        bindingVersion: '0.1.0'
  devnet:
    url: 'devnet.helius-rpc.com/?api-key={apiKey}'
    protocol: wss
    description: Helius Solana devnet WebSocket endpoint.
    variables:
      apiKey:
        description: Helius API key.
        default: YOUR_API_KEY
    bindings:
      ws:
        bindingVersion: '0.1.0'
  beta:
    url: 'beta.helius-rpc.com/?api-key={apiKey}'
    protocol: wss
    description: |
      Helius beta (Gatekeeper) WebSocket endpoint. Same wire protocol as mainnet;
      used for testing newer LaserStream WS / gatekeeper features.
    variables:
      apiKey:
        description: Helius API key.
        default: YOUR_API_KEY
    bindings:
      ws:
        bindingVersion: '0.1.0'
  atlas-mainnet:
    url: 'atlas-mainnet.helius-rpc.com/?api-key={apiKey}'
    protocol: wss
    description: |
      Legacy Atlas WebSocket endpoint historically used for Helius enhanced
      subscriptions (transactionSubscribe). Helius has unified these methods
      onto the standard mainnet endpoint; the Atlas host is preserved here for
      compatibility with existing clients still pointing at it.
    variables:
      apiKey:
        description: Helius API key.
        default: YOUR_API_KEY
    bindings:
      ws:
        bindingVersion: '0.1.0'
  laserstream-mainnet-ws:
    url: 'mainnet.helius-rpc.com/?api-key={apiKey}'
    protocol: wss
    description: |
      LaserStream WebSocket (mainnet). Runs on the same backend as the standard
      Helius WS endpoint and exposes the standard Solana subscription methods
      plus Helius-specific extensions, with up to ~200 ms lower latency than
      Agave RPC-based WebSockets. Requires Developer tier or higher; mainnet
      access requires Business/Professional plans.
    variables:
      apiKey:
        description: Helius API key.
        default: YOUR_API_KEY
    bindings:
      ws:
        bindingVersion: '0.1.0'

channels:

  accountSubscribe:
    description: |
      Subscribe to changes for a single Solana account. Notifications are emitted
      when the account's lamports or data change at the configured commitment level.
      Helius's accountSubscribe is "enhanced" on Helius WS — it accepts the standard
      Solana parameters and runs on the same unified endpoint as transactionSubscribe.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: accountNotification
      summary: Account change notifications.
      message:
        $ref: '#/components/messages/AccountNotification'
    publish:
      operationId: accountSubscribe
      summary: Open an accountSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/AccountSubscribeRequest'
          - $ref: '#/components/messages/AccountUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  blockSubscribe:
    description: |
      Subscribe to new blocks at a given commitment. Standard Solana PubSub method.
      Marked unstable by Solana; per Helius docs this is NOT supported on LaserStream WS,
      but is available on standard Helius mainnet/devnet WS endpoints.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: blockNotification
      summary: Block notifications.
      message:
        $ref: '#/components/messages/BlockNotification'
    publish:
      operationId: blockSubscribe
      summary: Open a blockSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/BlockSubscribeRequest'
          - $ref: '#/components/messages/BlockUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  logsSubscribe:
    description: Subscribe to transaction logs matching a filter (all, allWithVotes, or a specific mentions list).
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: logsNotification
      summary: Log notifications.
      message:
        $ref: '#/components/messages/LogsNotification'
    publish:
      operationId: logsSubscribe
      summary: Open a logsSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/LogsSubscribeRequest'
          - $ref: '#/components/messages/LogsUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  programSubscribe:
    description: Subscribe to all account changes owned by a given program.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: programNotification
      summary: Program account notifications.
      message:
        $ref: '#/components/messages/ProgramNotification'
    publish:
      operationId: programSubscribe
      summary: Open a programSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/ProgramSubscribeRequest'
          - $ref: '#/components/messages/ProgramUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  signatureSubscribe:
    description: Subscribe to confirmation status of a single transaction signature.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: signatureNotification
      summary: Signature confirmation notifications.
      message:
        $ref: '#/components/messages/SignatureNotification'
    publish:
      operationId: signatureSubscribe
      summary: Open a signatureSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/SignatureSubscribeRequest'
          - $ref: '#/components/messages/SignatureUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  slotSubscribe:
    description: Subscribe to slot processing notifications.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: slotNotification
      summary: Slot notifications.
      message:
        $ref: '#/components/messages/SlotNotification'
    publish:
      operationId: slotSubscribe
      summary: Open a slotSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/SlotSubscribeRequest'
          - $ref: '#/components/messages/SlotUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  slotsUpdatesSubscribe:
    description: |
      Subscribe to detailed slot status updates (firstShredReceived, completed,
      createdBank, frozen, dead, optimisticConfirmation, root). Marked unstable.
      Per Helius docs this is NOT supported on LaserStream WS, but is reachable
      on standard Helius mainnet/devnet WS endpoints.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: slotsUpdatesNotification
      summary: Slot update notifications.
      message:
        $ref: '#/components/messages/SlotsUpdatesNotification'
    publish:
      operationId: slotsUpdatesSubscribe
      summary: Open a slotsUpdatesSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/SlotsUpdatesSubscribeRequest'
          - $ref: '#/components/messages/SlotsUpdatesUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  voteSubscribe:
    description: |
      Subscribe to vote notifications from the gossip network. Marked unstable.
      Per Helius docs this is NOT supported on LaserStream WS, but is reachable
      on standard Helius mainnet/devnet WS endpoints.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: voteNotification
      summary: Vote notifications.
      message:
        $ref: '#/components/messages/VoteNotification'
    publish:
      operationId: voteSubscribe
      summary: Open a voteSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/VoteSubscribeRequest'
          - $ref: '#/components/messages/VoteUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  rootSubscribe:
    description: Subscribe to root slot notifications.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: rootNotification
      summary: Root slot notifications.
      message:
        $ref: '#/components/messages/RootNotification'
    publish:
      operationId: rootSubscribe
      summary: Open a rootSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/RootSubscribeRequest'
          - $ref: '#/components/messages/RootUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

  transactionSubscribe:
    description: |
      Helius enhanced subscription. Streams transactions matched by a
      TransactionSubscribeFilter (vote, failed, signature, accountInclude up to 50,000,
      accountExclude up to 50,000, accountRequired up to 50,000) and shaped by
      TransactionSubscribeOptions (commitment, encoding, transactionDetails, showRewards,
      maxSupportedTransactionVersion).

      Available on Helius mainnet/devnet WS endpoints (and the legacy atlas-mainnet
      endpoint). LaserStream WS supports transactionSubscribe with lower latency.
    bindings:
      ws:
        bindingVersion: '0.1.0'
    subscribe:
      operationId: transactionNotification
      summary: Filtered transaction notifications.
      message:
        $ref: '#/components/messages/TransactionNotification'
    publish:
      operationId: transactionSubscribe
      summary: Open a transactionSubscribe subscription.
      message:
        oneOf:
          - $ref: '#/components/messages/TransactionSubscribeRequest'
          - $ref: '#/components/messages/TransactionUnsubscribeRequest'
          - $ref: '#/components/messages/JsonRpcResponse'

components:

  messages:

    # -------- Standard Solana subscription requests --------

    AccountSubscribeRequest:
      name: accountSubscribe
      title: accountSubscribe request
      summary: JSON-RPC request opening an accountSubscribe subscription.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/AccountSubscribeRequestPayload'

    AccountUnsubscribeRequest:
      name: accountUnsubscribe
      title: accountUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    BlockSubscribeRequest:
      name: blockSubscribe
      title: blockSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/BlockSubscribeRequestPayload'

    BlockUnsubscribeRequest:
      name: blockUnsubscribe
      title: blockUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    LogsSubscribeRequest:
      name: logsSubscribe
      title: logsSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/LogsSubscribeRequestPayload'

    LogsUnsubscribeRequest:
      name: logsUnsubscribe
      title: logsUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    ProgramSubscribeRequest:
      name: programSubscribe
      title: programSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/ProgramSubscribeRequestPayload'

    ProgramUnsubscribeRequest:
      name: programUnsubscribe
      title: programUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    SignatureSubscribeRequest:
      name: signatureSubscribe
      title: signatureSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SignatureSubscribeRequestPayload'

    SignatureUnsubscribeRequest:
      name: signatureUnsubscribe
      title: signatureUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    SlotSubscribeRequest:
      name: slotSubscribe
      title: slotSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SlotSubscribeRequestPayload'

    SlotUnsubscribeRequest:
      name: slotUnsubscribe
      title: slotUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    SlotsUpdatesSubscribeRequest:
      name: slotsUpdatesSubscribe
      title: slotsUpdatesSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SlotsUpdatesSubscribeRequestPayload'

    SlotsUpdatesUnsubscribeRequest:
      name: slotsUpdatesUnsubscribe
      title: slotsUpdatesUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    VoteSubscribeRequest:
      name: voteSubscribe
      title: voteSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/VoteSubscribeRequestPayload'

    VoteUnsubscribeRequest:
      name: voteUnsubscribe
      title: voteUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    RootSubscribeRequest:
      name: rootSubscribe
      title: rootSubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/RootSubscribeRequestPayload'

    RootUnsubscribeRequest:
      name: rootUnsubscribe
      title: rootUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    TransactionSubscribeRequest:
      name: transactionSubscribe
      title: transactionSubscribe request
      summary: Helius enhanced subscription opening a filtered transaction stream.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/TransactionSubscribeRequestPayload'

    TransactionUnsubscribeRequest:
      name: transactionUnsubscribe
      title: transactionUnsubscribe request
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeRequestPayload'

    # -------- Generic JSON-RPC response (subscription id or unsubscribe ack) --------

    JsonRpcResponse:
      name: jsonRpcResponse
      title: JSON-RPC response
      summary: Response to a subscribe / unsubscribe request — carries the subscription id (subscribe) or a boolean (unsubscribe).
      contentType: application/json
      payload:
        $ref: '#/components/schemas/JsonRpcResponse'

    # -------- Notification messages --------

    AccountNotification:
      name: accountNotification
      title: accountNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/AccountNotificationPayload'

    BlockNotification:
      name: blockNotification
      title: blockNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/BlockNotificationPayload'

    LogsNotification:
      name: logsNotification
      title: logsNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/LogsNotificationPayload'

    ProgramNotification:
      name: programNotification
      title: programNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/ProgramNotificationPayload'

    SignatureNotification:
      name: signatureNotification
      title: signatureNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SignatureNotificationPayload'

    SlotNotification:
      name: slotNotification
      title: slotNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SlotNotificationPayload'

    SlotsUpdatesNotification:
      name: slotsUpdatesNotification
      title: slotsUpdatesNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SlotsUpdatesNotificationPayload'

    VoteNotification:
      name: voteNotification
      title: voteNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/VoteNotificationPayload'

    RootNotification:
      name: rootNotification
      title: rootNotification
      contentType: application/json
      payload:
        $ref: '#/components/schemas/RootNotificationPayload'

    TransactionNotification:
      name: transactionNotification
      title: transactionNotification
      summary: Helius enhanced transactionNotification payload.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/TransactionNotificationPayload'

  schemas:

    # ----- JSON-RPC envelopes -----

    JsonRpcRequestBase:
      type: object
      required: [jsonrpc, id, method]
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          oneOf:
            - { type: integer }
            - { type: string }
        method:
          type: string
        params:
          type: array

    JsonRpcResponse:
      type: object
      required: [jsonrpc, id]
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          oneOf:
            - { type: integer }
            - { type: string }
        result:
          description: For subscribe — a subscription id (integer). For unsubscribe — a boolean.
          oneOf:
            - { type: integer, description: Subscription id. }
            - { type: boolean, description: Unsubscribe acknowledgement. }
        error:
          $ref: '#/components/schemas/JsonRpcError'

    JsonRpcError:
      type: object
      required: [code, message]
      properties:
        code: { type: integer }
        message: { type: string }
        data: {}

    JsonRpcNotificationBase:
      type: object
      required: [jsonrpc, method, params]
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        method: { type: string }
        params:
          type: object
          required: [subscription]
          properties:
            subscription: { type: integer }
            result: {}

    # ----- Common Solana types -----

    Commitment:
      type: string
      enum: [processed, confirmed, finalized]

    Encoding:
      type: string
      enum: [base58, base64, base64+zstd, jsonParsed]

    Context:
      type: object
      required: [slot]
      properties:
        slot: { type: integer, format: int64 }
        apiVersion: { type: string }

    AccountInfo:
      type: object
      required: [lamports, owner, executable, rentEpoch]
      properties:
        lamports: { type: integer, format: int64 }
        owner: { type: string, description: Base58 program owner. }
        data:
          description: Encoded account data — string + encoding tuple, jsonParsed object, or base64+zstd encoded array.
        executable: { type: boolean }
        rentEpoch: { type: integer, format: int64 }
        space: { type: integer }

    UnsubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              enum:
                - accountUnsubscribe
                - blockUnsubscribe
                - logsUnsubscribe
                - programUnsubscribe
                - signatureUnsubscribe
                - slotUnsubscribe
                - slotsUpdatesUnsubscribe
                - voteUnsubscribe
                - rootUnsubscribe
                - transactionUnsubscribe
            params:
              type: array
              minItems: 1
              maxItems: 1
              items:
                type: integer
                description: Subscription id returned by the corresponding subscribe call.

    # ----- accountSubscribe -----

    AccountSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: accountSubscribe
            params:
              type: array
              minItems: 1
              maxItems: 2
              items:
                oneOf:
                  - type: string
                    description: Base58 account public key.
                  - type: object
                    properties:
                      commitment: { $ref: '#/components/schemas/Commitment' }
                      encoding: { $ref: '#/components/schemas/Encoding' }

    AccountNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: accountNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  required: [context, value]
                  properties:
                    context: { $ref: '#/components/schemas/Context' }
                    value: { $ref: '#/components/schemas/AccountInfo' }

    # ----- blockSubscribe -----

    BlockSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: blockSubscribe
            params:
              type: array
              minItems: 1
              maxItems: 2
              items:
                oneOf:
                  - type: string
                    enum: [all]
                  - type: object
                    properties:
                      mentionsAccountOrProgram: { type: string }
                  - type: object
                    properties:
                      commitment: { $ref: '#/components/schemas/Commitment' }
                      encoding: { $ref: '#/components/schemas/Encoding' }
                      transactionDetails:
                        type: string
                        enum: [full, accounts, signatures, none]
                      showRewards: { type: boolean }
                      maxSupportedTransactionVersion: { type: integer, enum: [0] }

    BlockNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: blockNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  required: [context, value]
                  properties:
                    context: { $ref: '#/components/schemas/Context' }
                    value:
                      type: object
                      properties:
                        slot: { type: integer, format: int64 }
                        err: {}
                        block:
                          type: object
                          properties:
                            blockhash: { type: string }
                            previousBlockhash: { type: string }
                            parentSlot: { type: integer, format: int64 }
                            transactions:
                              type: array
                              items: { type: object }
                            rewards:
                              type: array
                              items: { type: object }
                            blockTime: { type: integer, format: int64 }
                            blockHeight: { type: integer, format: int64 }

    # ----- logsSubscribe -----

    LogsSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: logsSubscribe
            params:
              type: array
              minItems: 1
              maxItems: 2
              items:
                oneOf:
                  - type: string
                    enum: [all, allWithVotes]
                  - type: object
                    properties:
                      mentions:
                        type: array
                        maxItems: 1
                        items: { type: string }
                  - type: object
                    properties:
                      commitment: { $ref: '#/components/schemas/Commitment' }

    LogsNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: logsNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  required: [context, value]
                  properties:
                    context: { $ref: '#/components/schemas/Context' }
                    value:
                      type: object
                      properties:
                        signature: { type: string }
                        err: {}
                        logs:
                          type: array
                          items: { type: string }

    # ----- programSubscribe -----

    ProgramSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: programSubscribe
            params:
              type: array
              minItems: 1
              maxItems: 2
              items:
                oneOf:
                  - type: string
                    description: Base58 program id.
                  - type: object
                    properties:
                      commitment: { $ref: '#/components/schemas/Commitment' }
                      encoding: { $ref: '#/components/schemas/Encoding' }
                      filters:
                        type: array
                        items:
                          oneOf:
                            - type: object
                              properties:
                                dataSize: { type: integer }
                            - type: object
                              properties:
                                memcmp:
                                  type: object
                                  properties:
                                    offset: { type: integer }
                                    bytes: { type: string }

    ProgramNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: programNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  required: [context, value]
                  properties:
                    context: { $ref: '#/components/schemas/Context' }
                    value:
                      type: object
                      properties:
                        pubkey: { type: string }
                        account: { $ref: '#/components/schemas/AccountInfo' }

    # ----- signatureSubscribe -----

    SignatureSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: signatureSubscribe
            params:
              type: array
              minItems: 1
              maxItems: 2
              items:
                oneOf:
                  - type: string
                    description: Transaction signature (base58).
                  - type: object
                    properties:
                      commitment: { $ref: '#/components/schemas/Commitment' }
                      enableReceivedNotification: { type: boolean }

    SignatureNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: signatureNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  required: [context, value]
                  properties:
                    context: { $ref: '#/components/schemas/Context' }
                    value:
                      oneOf:
                        - type: object
                          properties:
                            err: {}
                        - type: string
                          enum: [receivedSignature]

    # ----- slotSubscribe -----

    SlotSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - type: object
          properties:
            method:
              type: string
              const: slotSubscribe
            params:
              type: array
              maxItems: 0

    SlotNotificationPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcNotificationBase'
        - type: object
          properties:
            method:
              type: string
              const: slotNotification
            params:
              type: object
              required: [subscription, result]
              properties:
                subscription: { type: integer }
                result:
                  type: object
                  properties:
                    parent: { type: integer, format: int64 }
                    root: { type: integer, format: int64 }
                    slot: { type: integer, format: int64 }

    # ----- slotsUpdatesSubscribe -----

    SlotsUpdatesSubscribeRequestPayload:
      allOf:
        - $ref: '#/components/schemas/JsonRpcRequestBase'
        - t

# --- truncated at 32 KB (38 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/helius/refs/heads/main/asyncapi/helius-asyncapi.yml