Flow Subscribe events API

openapi: 3.0.0
info:
  version: 1.0.0
  title: Access Accounts Subscribe events API
servers:
- url: https://rest-testnet.onflow.org/v1
  description: Flow Testnet
- url: https://rest-mainnet.onflow.org/v1
  description: Flow Mainnet
tags:
- name: Subscribe events
paths:
  /subscribe_events:
    get:
      summary: Subscribe events
      description: 'IMPORTANT NOTE: This is a WebSocket connection, so the `ws://` or `wss://` schema should be used to subscribe to this endpoint.


        This endpoint streams on-chain events for all blocks starting at the requested start block, up until the latest available block. Once the latest block is reached, the stream will remain open, and responses will be sent for each new block as it becomes available.

        '
      tags:
      - Subscribe events
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SubscribeEvents'
          description: OK
        '400':
          $ref: '#/components/responses/400BadRequestWS'
        '408':
          $ref: '#/components/responses/408ServerTimeoutWS'
        '500':
          $ref: '#/components/responses/500InternalServerErrorWS'
        '503':
          $ref: '#/components/responses/503ServiceUnavailableWS'
      parameters:
      - name: start_height
        in: query
        description: The block height of the events being streamed. Either provide this parameter or `start_block_id` parameter. This parameter is incompatible with `start_block_id` parameter.
        required: false
        schema:
          $ref: '#/components/schemas/BlockHeight'
        allowEmptyValue: false
      - name: start_block_id
        description: The block id of the events being streamed. Either provide this parameter or `start_height` parameter. This parameter is incompatible with `start_height` parameter.
        in: query
        required: false
        schema:
          $ref: '#/components/schemas/Identifier'
      - name: heartbeat_interval
        description: Interval in block heights at which the server should return a heartbeat message to the client.
        in: query
        required: false
        allowEmptyValue: false
        schema:
          type: string
          format: uint64
      - name: event_types
        in: query
        description: A comma-separated list of events type to include.
        required: false
        allowEmptyValue: false
        schema:
          type: array
          items:
            $ref: '#/components/schemas/EventType'
          minItems: 1
          uniqueItems: true
      - name: addresses
        in: query
        description: A comma-separated list of addresses who's events should be included.
        required: false
        allowEmptyValue: false
        schema:
          type: array
          items:
            type: string
          minItems: 1
          uniqueItems: true
      - name: contracts
        in: query
        description: A comma-separated list of contracts who's events should be included.
        required: false
        allowEmptyValue: false
        schema:
          type: array
          items:
            type: string
          minItems: 1
          uniqueItems: true
components:
  schemas:
    Identifier:
      description: A 32-byte unique identifier for an entity.
      type: string
      format: hexadecimal
      pattern: '[a-fA-F0-9]{64}'
    EventType:
      description: The qualified event type.
      type: string
    Event:
      type: object
      required:
      - type
      - transaction_id
      - transaction_index
      - event_index
      - payload
      properties:
        type:
          $ref: '#/components/schemas/EventType'
        transaction_id:
          $ref: '#/components/schemas/Identifier'
        transaction_index:
          type: string
          format: uint64
        event_index:
          type: string
          format: uint64
        payload:
          type: string
          format: byte
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
    SubscribeEvents:
      type: object
      properties:
        BlockId:
          $ref: '#/components/schemas/Identifier'
        Height:
          type: string
        Events:
          type: array
          items:
            $ref: '#/components/schemas/Event'
    BlockHeight:
      oneOf:
      - type: string
        format: uint64
      - type: string
        enum:
        - final
        - sealed
  responses:
    500InternalServerErrorWS:
      description: 'Internal Server Error


        As OpenAPI does not support WebSocket description, this error code (1011) is actually returned in a close message instead of (500).

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    400BadRequestWS:
      description: 'Bad Request


        As OpenAPI does not support WebSocket description, the error code (1003) is actually returned in a close message instead of (400).

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    503ServiceUnavailableWS:
      description: 'Service Unavailable


        As OpenAPI does not support WebSocket description, this error code (1013) is actually returned in a close message instead of (503).

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    408ServerTimeoutWS:
      description: 'Server Timeout


        As OpenAPI does not support WebSocket description, this error code (1001) is actually returned in a close message instead of (408).

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
externalDocs:
  description: Find out more about the Access API
  url: https://docs.onflow.org/access-api/