asyncapi: '2.6.0'
info:
  title: Alchemy WebSocket Subscription API
  version: '1.0.0'
  description: |
    AsyncAPI definition for Alchemy's JSON-RPC WebSocket subscription API. Clients
    open a `wss://` connection to a per-network Alchemy endpoint and use the
    standard Ethereum `eth_subscribe` / `eth_unsubscribe` methods to receive
    asynchronous `eth_subscription` notifications.

    Alchemy supports the four standard subscription types defined by Geth
    (`newHeads`, `logs`, `newPendingTransactions`, `syncing`) plus two
    Alchemy-enhanced subscription types:

      * `alchemy_minedTransactions` (formerly `alchemy_filteredNewFullPendingTransactions`)
      * `alchemy_pendingTransactions` (formerly `alchemy_filteredFullPendingTransactions`)

    All messages travel inside the JSON-RPC 2.0 envelope. Subscription
    notifications use `method = "eth_subscription"` with a `params` object that
    carries the `subscription` id and the per-type `result` payload.

    Source documentation:
      * https://www.alchemy.com/docs/reference/eth-subscribe
      * https://www.alchemy.com/docs/reference/eth-unsubscribe
      * https://www.alchemy.com/docs/reference/newheads
      * https://www.alchemy.com/docs/reference/logs
      * https://www.alchemy.com/docs/reference/newpendingtransactions
      * https://www.alchemy.com/docs/reference/alchemy-minedtransactions
      * https://www.alchemy.com/docs/reference/alchemy-pendingtransactions
  contact:
    name: Alchemy Support
    url: https://www.alchemy.com/support
  license:
    name: Proprietary
    url: https://www.alchemy.com/policies/terms

defaultContentType: application/json

servers:
  production:
    url: wss://{network}.g.alchemy.com/v2/{apiKey}
    protocol: wss
    description: |
      Alchemy WebSocket endpoint. `network` selects the chain (for example
      `eth-mainnet`, `eth-sepolia`, `polygon-mainnet`, `arb-mainnet`,
      `opt-mainnet`, `base-mainnet`). `apiKey` is the Alchemy app API key.
    variables:
      network:
        default: eth-mainnet
        description: Alchemy network slug.
        enum:
          - eth-mainnet
          - eth-sepolia
          - eth-holesky
          - polygon-mainnet
          - polygon-amoy
          - arb-mainnet
          - arb-sepolia
          - opt-mainnet
          - opt-sepolia
          - base-mainnet
          - base-sepolia
      apiKey:
        default: demo
        description: Alchemy app API key.
    security:
      - apiKeyInUrl: []

channels:
  /:
    description: |
      The single multiplexed JSON-RPC WebSocket channel. Clients publish
      `eth_subscribe` and `eth_unsubscribe` requests, and the server publishes
      acknowledgement responses and `eth_subscription` notifications for every
      active subscription on the same connection.
    publish:
      operationId: sendRpcRequest
      summary: Send a JSON-RPC request (subscribe / unsubscribe).
      message:
        oneOf:
          - $ref: '#/components/messages/EthSubscribeRequest'
          - $ref: '#/components/messages/EthUnsubscribeRequest'
    subscribe:
      operationId: receiveRpcMessage
      summary: Receive a JSON-RPC response or subscription notification.
      message:
        oneOf:
          - $ref: '#/components/messages/SubscribeResponse'
          - $ref: '#/components/messages/UnsubscribeResponse'
          - $ref: '#/components/messages/NewHeadsNotification'
          - $ref: '#/components/messages/LogsNotification'
          - $ref: '#/components/messages/NewPendingTransactionsNotification'
          - $ref: '#/components/messages/SyncingNotification'
          - $ref: '#/components/messages/AlchemyMinedTransactionsNotification'
          - $ref: '#/components/messages/AlchemyPendingTransactionsNotification'
          - $ref: '#/components/messages/RpcErrorResponse'

components:
  securitySchemes:
    apiKeyInUrl:
      type: httpApiKey
      in: query
      name: apiKey
      description: |
        Alchemy authenticates the WebSocket by embedding the app API key in the
        connection URL path (`/v2/{apiKey}`). No additional headers or
        per-message credentials are required.

  messages:
    EthSubscribeRequest:
      name: EthSubscribeRequest
      title: eth_subscribe request
      summary: Create a new subscription.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/EthSubscribeRequest'

    EthUnsubscribeRequest:
      name: EthUnsubscribeRequest
      title: eth_unsubscribe request
      summary: Cancel an existing subscription by id.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/EthUnsubscribeRequest'

    SubscribeResponse:
      name: SubscribeResponse
      title: eth_subscribe response
      summary: Acknowledgement of an eth_subscribe call, returning the subscription id.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SubscribeResponse'

    UnsubscribeResponse:
      name: UnsubscribeResponse
      title: eth_unsubscribe response
      summary: Acknowledgement of an eth_unsubscribe call.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/UnsubscribeResponse'

    RpcErrorResponse:
      name: RpcErrorResponse
      title: JSON-RPC error response
      summary: JSON-RPC 2.0 error envelope returned for malformed or unauthorized requests.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/RpcErrorResponse'

    NewHeadsNotification:
      name: NewHeadsNotification
      title: newHeads notification
      summary: Emitted when a new block header is added to the chain.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/NewHeadsNotification'

    LogsNotification:
      name: LogsNotification
      title: logs notification
      summary: Emitted for every log entry matching the filter as new blocks are produced.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/LogsNotification'

    NewPendingTransactionsNotification:
      name: NewPendingTransactionsNotification
      title: newPendingTransactions notification
      summary: |
        Emitted with the hash of each transaction newly added to the Alchemy
        mempool. Note that only transactions seen by Alchemy nodes are
        delivered.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/NewPendingTransactionsNotification'

    SyncingNotification:
      name: SyncingNotification
      title: syncing notification
      summary: |
        Emitted when the node starts or stops synchronizing with the network,
        with progress details while syncing.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SyncingNotification'

    AlchemyMinedTransactionsNotification:
      name: AlchemyMinedTransactionsNotification
      title: alchemy_minedTransactions notification
      summary: |
        Emitted for every transaction that gets mined matching the configured
        `addresses` filter. Formerly `alchemy_filteredNewFullPendingTransactions`.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/AlchemyMinedTransactionsNotification'

    AlchemyPendingTransactionsNotification:
      name: AlchemyPendingTransactionsNotification
      title: alchemy_pendingTransactions notification
      summary: |
        Emitted for every pending transaction matching the `fromAddress` /
        `toAddress` filter. Formerly `alchemy_filteredFullPendingTransactions`.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/AlchemyPendingTransactionsNotification'

  schemas:
    # ---------------------------------------------------------------------
    # Primitive helpers
    # ---------------------------------------------------------------------
    Hex:
      type: string
      pattern: '^0x[0-9a-fA-F]*$'
      description: Hex-encoded value (`0x` prefixed).

    HexQuantity:
      type: string
      pattern: '^0x([1-9a-fA-F][0-9a-fA-F]*|0)$'
      description: Hex-encoded quantity (`0x` prefixed, no leading zeros).

    Address:
      type: string
      pattern: '^0x[0-9a-fA-F]{40}$'
      description: 20-byte Ethereum address (`0x` + 40 hex chars).

    Hash32:
      type: string
      pattern: '^0x[0-9a-fA-F]{64}$'
      description: 32-byte hash (`0x` + 64 hex chars).

    SubscriptionId:
      type: string
      pattern: '^0x[0-9a-fA-F]+$'
      description: Subscription identifier returned by `eth_subscribe`.

    Topic:
      oneOf:
        - type: 'null'
        - $ref: '#/components/schemas/Hash32'
        - type: array
          items:
            $ref: '#/components/schemas/Hash32'

    # ---------------------------------------------------------------------
    # JSON-RPC envelope
    # ---------------------------------------------------------------------
    JsonRpcId:
      oneOf:
        - type: integer
        - type: string
        - type: 'null'
      description: JSON-RPC 2.0 request/response id correlator.

    EthSubscribeRequest:
      type: object
      required: [jsonrpc, method, params, id]
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        id:
          $ref: '#/components/schemas/JsonRpcId'
        method:
          type: string
          enum: [eth_subscribe]
        params:
          type: array
          minItems: 1
          maxItems: 2
          description: |
            Tuple of `[subscriptionType, options?]`. The shape of `options`
            depends on the subscription type.
          items:
            oneOf:
              - type: string
                enum:
                  - newHeads
                  - logs
                  - newPendingTransactions
                  - syncing
                  - alchemy_minedTransactions
                  - alchemy_pendingTransactions
              - oneOf:
                  - $ref: '#/components/schemas/LogsFilter'
                  - $ref: '#/components/schemas/AlchemyMinedTransactionsFilter'
                  - $ref: '#/components/schemas/AlchemyPendingTransactionsFilter'
      example:
        jsonrpc: '2.0'
        id: 1
        method: eth_subscribe
        params:
          - newHeads

    EthUnsubscribeRequest:
      type: object
      required: [jsonrpc, method, params, id]
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        id:
          $ref: '#/components/schemas/JsonRpcId'
        method:
          type: string
          enum: [eth_unsubscribe]
        params:
          type: array
          minItems: 1
          maxItems: 1
          items:
            $ref: '#/components/schemas/SubscriptionId'
      example:
        jsonrpc: '2.0'
        id: 2
        method: eth_unsubscribe
        params:
          - '0x9cef478923ff08bf67fde6c64013158d'

    SubscribeResponse:
      type: object
      required: [jsonrpc, id, result]
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        id:
          $ref: '#/components/schemas/JsonRpcId'
        result:
          $ref: '#/components/schemas/SubscriptionId'
      example:
        jsonrpc: '2.0'
        id: 1
        result: '0x9cef478923ff08bf67fde6c64013158d'

    UnsubscribeResponse:
      type: object
      required: [jsonrpc, id, result]
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        id:
          $ref: '#/components/schemas/JsonRpcId'
        result:
          type: boolean
      example:
        jsonrpc: '2.0'
        id: 2
        result: true

    RpcErrorResponse:
      type: object
      required: [jsonrpc, id, error]
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        id:
          $ref: '#/components/schemas/JsonRpcId'
        error:
          type: object
          required: [code, message]
          properties:
            code:
              type: integer
            message:
              type: string
            data:
              description: Optional error data.

    NotificationEnvelope:
      type: object
      required: [jsonrpc, method, params]
      description: Common shape for every `eth_subscription` notification.
      properties:
        jsonrpc:
          type: string
          enum: ['2.0']
        method:
          type: string
          enum: [eth_subscription]
        params:
          type: object
          required: [subscription, result]
          properties:
            subscription:
              $ref: '#/components/schemas/SubscriptionId'
            result:
              description: Per-subscription-type payload.

    # ---------------------------------------------------------------------
    # Filter / options objects
    # ---------------------------------------------------------------------
    LogsFilter:
      type: object
      description: Optional filter for the `logs` subscription.
      properties:
        address:
          oneOf:
            - $ref: '#/components/schemas/Address'
            - type: array
              items:
                $ref: '#/components/schemas/Address'
          description: Single address or array of addresses to filter logs by.
        topics:
          type: array
          maxItems: 4
          description: |
            Up to four topic specifiers. Each entry can be `null`, a single
            32-byte topic hash, or an array of hashes (logical OR).
          items:
            $ref: '#/components/schemas/Topic'

    AlchemyMinedTransactionsFilter:
      type: object
      description: |
        Options for `alchemy_minedTransactions`. All fields are optional.
      properties:
        addresses:
          type: array
          maxItems: 1000
          description: |
            Filter by `to` and/or `from` addresses. Maximum 1000 total
            addresses across the filter.
          items:
            type: object
            properties:
              to:
                $ref: '#/components/schemas/Address'
              from:
                $ref: '#/components/schemas/Address'
        includeRemoved:
          type: boolean
          default: false
          description: |
            When `true`, also emit transactions in blocks that have been
            removed from the canonical chain (reorgs).
        hashesOnly:
          type: boolean
          default: false
          description: |
            When `true`, the `transaction` field contains only the transaction
            hash. When `false`, it contains the full transaction object
            (matching the payload of `eth_getTransactionByHash`).

    AlchemyPendingTransactionsFilter:
      type: object
      description: |
        Options for `alchemy_pendingTransactions`. All fields are optional.
        A maximum of 1000 addresses across `fromAddress` and `toAddress`
        combined is allowed.
      properties:
        fromAddress:
          oneOf:
            - $ref: '#/components/schemas/Address'
            - type: array
              items:
                $ref: '#/components/schemas/Address'
          description: One sender address or an array of sender addresses.
        toAddress:
          oneOf:
            - $ref: '#/components/schemas/Address'
            - type: array
              items:
                $ref: '#/components/schemas/Address'
          description: One recipient address or an array of recipient addresses.
        hashesOnly:
          type: boolean
          default: false
          description: |
            When `true`, the notification `result` is a transaction hash
            string. When `false`, it is the full transaction object.

    # ---------------------------------------------------------------------
    # Result payloads
    # ---------------------------------------------------------------------
    BlockHeader:
      type: object
      description: Block header emitted for the `newHeads` subscription.
      properties:
        number:
          oneOf:
            - $ref: '#/components/schemas/HexQuantity'
            - type: 'null'
          description: Block number (null for pending blocks).
        hash:
          $ref: '#/components/schemas/Hash32'
        parentHash:
          $ref: '#/components/schemas/Hash32'
        nonce:
          oneOf:
            - $ref: '#/components/schemas/Hex'
            - type: 'null'
          description: Proof-of-work nonce (null for pending blocks).
        sha3Uncles:
          $ref: '#/components/schemas/Hash32'
        logsBloom:
          oneOf:
            - $ref: '#/components/schemas/Hex'
            - type: 'null'
          description: 256-byte log bloom filter (null for pending blocks).
        transactionsRoot:
          $ref: '#/components/schemas/Hash32'
        stateRoot:
          $ref: '#/components/schemas/Hash32'
        receiptsRoot:
          $ref: '#/components/schemas/Hash32'
        miner:
          $ref: '#/components/schemas/Address'
        difficulty:
          $ref: '#/components/schemas/HexQuantity'
        extraData:
          $ref: '#/components/schemas/Hex'
        gasLimit:
          $ref: '#/components/schemas/HexQuantity'
        gasUsed:
          $ref: '#/components/schemas/HexQuantity'
        timestamp:
          $ref: '#/components/schemas/HexQuantity'

    LogObject:
      type: object
      description: Log entry emitted for the `logs` subscription.
      properties:
        address:
          $ref: '#/components/schemas/Address'
        blockHash:
          $ref: '#/components/schemas/Hash32'
        blockNumber:
          $ref: '#/components/schemas/HexQuantity'
        data:
          $ref: '#/components/schemas/Hex'
        logIndex:
          $ref: '#/components/schemas/HexQuantity'
        topics:
          type: array
          maxItems: 4
          items:
            $ref: '#/components/schemas/Hash32'
        transactionHash:
          $ref: '#/components/schemas/Hash32'
        transactionIndex:
          $ref: '#/components/schemas/HexQuantity'
        removed:
          type: boolean
          description: |
            `true` when the log was removed due to a chain reorganization.

    Transaction:
      type: object
      description: |
        Full transaction object matching the response payload of
        `eth_getTransactionByHash`.
      properties:
        blockHash:
          oneOf:
            - $ref: '#/components/schemas/Hash32'
            - type: 'null'
        blockNumber:
          oneOf:
            - $ref: '#/components/schemas/HexQuantity'
            - type: 'null'
        from:
          $ref: '#/components/schemas/Address'
        gas:
          $ref: '#/components/schemas/HexQuantity'
        gasPrice:
          $ref: '#/components/schemas/HexQuantity'
        maxFeePerGas:
          $ref: '#/components/schemas/HexQuantity'
        maxPriorityFeePerGas:
          $ref: '#/components/schemas/HexQuantity'
        hash:
          $ref: '#/components/schemas/Hash32'
        input:
          $ref: '#/components/schemas/Hex'
        nonce:
          $ref: '#/components/schemas/HexQuantity'
        to:
          oneOf:
            - $ref: '#/components/schemas/Address'
            - type: 'null'
        transactionIndex:
          oneOf:
            - $ref: '#/components/schemas/HexQuantity'
            - type: 'null'
        value:
          $ref: '#/components/schemas/HexQuantity'
        type:
          $ref: '#/components/schemas/HexQuantity'
        chainId:
          $ref: '#/components/schemas/HexQuantity'
        v:
          $ref: '#/components/schemas/HexQuantity'
        r:
          $ref: '#/components/schemas/Hex'
        s:
          $ref: '#/components/schemas/Hex'

    SyncingStatus:
      type: object
      description: |
        Sync progress object returned while the node is syncing. When syncing
        stops, the result becomes `false`.
      properties:
        startingBlock:
          $ref: '#/components/schemas/HexQuantity'
        currentBlock:
          $ref: '#/components/schemas/HexQuantity'
        highestBlock:
          $ref: '#/components/schemas/HexQuantity'
        pulledStates:
          $ref: '#/components/schemas/HexQuantity'
        knownStates:
          $ref: '#/components/schemas/HexQuantity'

    # ---------------------------------------------------------------------
    # Per-subscription notification payloads
    # ---------------------------------------------------------------------
    NewHeadsNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  $ref: '#/components/schemas/BlockHeader'
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0x9ce59a13059e417087c02d3236a0b1cc'
          result:
            number: '0x1b4'
            hash: '0xdc0818cf78f21a8e70579cb46a43643f78291264dda342ae31049421c82d21ae'
            parentHash: '0x9b39b7e0d8e58a3a3f0d2c8c9e9d8e7b3a8c8c8c8c8c8c8c8c8c8c8c8c8c8c8c'
            nonce: '0x689056015818adbe'
            sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347'
            logsBloom: '0x00...00'
            transactionsRoot: '0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421'
            stateRoot: '0xddc8b0234c2e0cad087c8b389aa7ef01f7d79b2570bccb77ce48648aa61c904d'
            receiptsRoot: '0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421'
            miner: '0xbb7b8287f3f0a933474a79eae42cbca977791171'
            difficulty: '0x4ea3f27bc'
            extraData: '0x476574682f4c5649562f76312e302e302f6c696e75782f676f312e342e32'
            gasLimit: '0x1388'
            gasUsed: '0x0'
            timestamp: '0x55ba467c'

    LogsNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  $ref: '#/components/schemas/LogObject'
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0x4a8a4c0517381924f9838102c5a4dcb7'
          result:
            address: '0x8320fe7702b96808f7bbc0d4a888ed1468216cfd'
            blockHash: '0x61cdb2a09ab99abf791d474f20c2ea89bf8de2923a2d42bb49944c8c993cbf04'
            blockNumber: '0x29e87'
            data: '0x0000000000000000000000000000000000000000000000000000000000000003'
            logIndex: '0x0'
            topics:
              - '0xd78a0cb8bb633d06981248b816e7bd33c2a35a6089241d099fa519e361cab902'
            transactionHash: '0xe044554a0a55067caafd07f8020ab9f2af60bdfe337e395ecd84b4877a3d1ab4'
            transactionIndex: '0x0'

    NewPendingTransactionsNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  $ref: '#/components/schemas/Hash32'
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0xc3b33aa549fb9a60e95d21862596617c'
          result: '0xd6fdc5cc41a9959e922f30cb772a9aef46f4daea279307bc5f7024edc4ccd7fa'

    SyncingNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  oneOf:
                    - type: object
                      required: [syncing, status]
                      properties:
                        syncing:
                          type: boolean
                          enum: [true]
                        status:
                          $ref: '#/components/schemas/SyncingStatus'
                    - type: object
                      required: [syncing]
                      properties:
                        syncing:
                          type: boolean
                          enum: [false]
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0xe2ffeb2703bcf602d42922385829ce96'
          result:
            syncing: true
            status:
              startingBlock: '0x384'
              currentBlock: '0x386'
              highestBlock: '0x454'
              pulledStates: '0x17266'
              knownStates: '0x17266'

    AlchemyMinedTransactionsNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  type: object
                  required: [removed, transaction]
                  properties:
                    removed:
                      type: boolean
                      description: |
                        `true` when the transaction's block was removed during
                        a chain reorganization. Always present and only ever
                        `true` when the subscription was created with
                        `includeRemoved: true`.
                    transaction:
                      oneOf:
                        - $ref: '#/components/schemas/Hash32'
                        - $ref: '#/components/schemas/Transaction'
                      description: |
                        Transaction hash when the subscription was created with
                        `hashesOnly: true`; otherwise the full transaction
                        object.
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0x9a52eeddc2b289f4b3a5da57c1f790f7'
          result:
            removed: false
            transaction:
              blockHash: '0x9b21cd0a90e6f7f6f0bd2b3fda6f96b6b3ca9c5cd9f1f7b3a5e8b1ad0eb4ff8d'
              blockNumber: '0x10d4f00'
              from: '0x8f4f6f0a3a3b0d6cf3b4f2c6f8c2c2c0e1c2d3e4'
              gas: '0x5208'
              gasPrice: '0x4a817c800'
              hash: '0xab1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcd'
              input: '0x'
              nonce: '0x1'
              to: '0x1234567890abcdef1234567890abcdef12345678'
              transactionIndex: '0x0'
              value: '0xde0b6b3a7640000'
              v: '0x25'
              r: '0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890'
              s: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef'

    AlchemyPendingTransactionsNotification:
      allOf:
        - $ref: '#/components/schemas/NotificationEnvelope'
        - type: object
          properties:
            params:
              type: object
              properties:
                subscription:
                  $ref: '#/components/schemas/SubscriptionId'
                result:
                  oneOf:
                    - $ref: '#/components/schemas/Hash32'
                    - $ref: '#/components/schemas/Transaction'
                  description: |
                    Transaction hash when the subscription was created with
                    `hashesOnly: true`; otherwise the full transaction object
                    (with `blockHash`, `blockNumber`, and `transactionIndex`
                    all `null` because the transaction is still pending).
      example:
        jsonrpc: '2.0'
        method: eth_subscription
        params:
          subscription: '0x1a8c33aa5d4f9b80e95d21862596617c'
          result:
            blockHash: null
            blockNumber: null
            from: '0x8f4f6f0a3a3b0d6cf3b4f2c6f8c2c2c0e1c2d3e4'
            gas: '0x5208'
            gasPrice: '0x4a817c800'
            hash: '0xd6fdc5cc41a9959e922f30cb772a9aef46f4daea279307bc5f7024edc4ccd7fa'
            input: '0x'
            nonce: '0x2'
            to: '0x1234567890abcdef1234567890abcdef12345678'
            transactionIndex: null
            value: '0xde0b6b3a7640000'
            v: '0x25'
            r: '0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890'
            s: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef'