Amberdata WebSocket Streaming API

asyncapi: '2.6.0'
id: 'urn:io:amberdata:ws:web3api:streaming'
info:
  title: Amberdata WebSocket Streaming API
  version: '1.0.0'
  description: |
    AsyncAPI 2.6 description of Amberdata's **real-time WebSocket streaming**
    surface.

    Unlike the Groq reference (which exposes no WebSocket), Amberdata DOES
    publish a documented public WebSocket API. Clients open a secure WebSocket
    connection to `wss://ws.web3api.io` and authenticate with the same
    `x-api-key` header used for REST. Subscriptions are managed with
    **JSON-RPC 2.0** request messages (`method: "subscribe"` /
    `method: "unsubscribe"`); the server then pushes a stream of update
    messages for each subscribed topic.

    Example connection (from Amberdata docs):
    `wscat -c "wss://ws.web3api.io" -H "x-api-key: <api-key>"`

    Topics are colon-delimited channel names such as `market:spot:trades`,
    `market:spot:prices`, and on-chain event channels. A subscription's params
    array carries the channel name plus a filter object (e.g. exchange + pair).

    This document models the JSON-RPC subscribe/unsubscribe control messages
    and the streamed update messages. REST request/response shapes are modeled
    in the companion OpenAPI document at `openapi/amberdata-openapi.yml`.
  contact:
    name: API Evangelist
    email: kin@apievangelist.com
    url: https://apievangelist.com
  license:
    name: API documentation - Amberdata Terms of Service
    url: https://www.amberdata.io/terms-of-service
  x-transport-notes:
    transport: WebSocket (secure)
    protocol: wss
    direction: bidirectional
    controlProtocol: JSON-RPC 2.0
    auth: 'x-api-key header sent on the WebSocket upgrade request'
    source: https://docs.amberdata.io/real-time/websocket-getting-started
defaultContentType: application/json
servers:
  web3api:
    url: ws.web3api.io
    protocol: wss
    description: |
      Amberdata real-time WebSocket endpoint for blockchain and market data.
      Authenticate by sending the `x-api-key` header on the connection upgrade
      request. After connecting, send JSON-RPC 2.0 `subscribe` messages to
      begin receiving topic updates.
    security:
      - apiKeyAuth: []
channels:
  market:spot:trades:
    description: |
      Real-time spot trade stream. Subscribe with a JSON-RPC 2.0 message whose
      params are `["market:spot:trades", { "exchange": "binance", "pair":
      "btc_usdt" }]`. The server then pushes a trade update message for each
      executed trade matching the filter.
    publish:
      operationId: subscribeSpotTrades
      summary: Send a JSON-RPC subscribe/unsubscribe request for spot trades.
      message:
        oneOf:
          - $ref: '#/components/messages/SubscribeRequest'
          - $ref: '#/components/messages/UnsubscribeRequest'
    subscribe:
      operationId: receiveSpotTrades
      summary: Receive streamed spot trade updates.
      message:
        $ref: '#/components/messages/SpotTradeUpdate'
  market:spot:prices:
    description: |
      Real-time spot price stream. Subscribe with params
      `["market:spot:prices", { "pair": "eth_usd" }]` to receive latest price
      updates as they occur.
    publish:
      operationId: subscribeSpotPrices
      summary: Send a JSON-RPC subscribe/unsubscribe request for spot prices.
      message:
        oneOf:
          - $ref: '#/components/messages/SubscribeRequest'
          - $ref: '#/components/messages/UnsubscribeRequest'
    subscribe:
      operationId: receiveSpotPrices
      summary: Receive streamed spot price updates.
      message:
        $ref: '#/components/messages/SpotPriceUpdate'
components:
  securitySchemes:
    apiKeyAuth:
      type: httpApiKey
      in: header
      name: x-api-key
      description: |
        Amberdata API key sent as the `x-api-key` header on the WebSocket
        upgrade (connection) request. The same key used for the REST API.
  messages:
    SubscribeRequest:
      name: SubscribeRequest
      title: JSON-RPC subscribe request
      summary: Client message that subscribes to a topic.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/JsonRpcSubscribe'
      examples:
        - name: subscribeTrades
          summary: Subscribe to Binance BTC/USDT spot trades
          payload:
            jsonrpc: '2.0'
            id: 1
            method: subscribe
            params:
              - market:spot:trades
              - exchange: binance
                pair: btc_usdt
    UnsubscribeRequest:
      name: UnsubscribeRequest
      title: JSON-RPC unsubscribe request
      summary: Client message that unsubscribes from a topic by subscription id.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/JsonRpcUnsubscribe'
      examples:
        - name: unsubscribe
          summary: Unsubscribe from a previously returned subscription id
          payload:
            jsonrpc: '2.0'
            id: 2
            method: unsubscribe
            params:
              - 0xb
    SpotTradeUpdate:
      name: SpotTradeUpdate
      title: Spot trade update
      summary: A single real-time spot trade event pushed by the server.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SpotTrade'
      examples:
        - name: trade
          summary: Trade update message
          payload:
            jsonrpc: '2.0'
            method: subscription
            params:
              subscription: '0xb'
              result:
                exchange: binance
                pair: btc_usdt
                price: '64850.10'
                volume: '0.0125'
                timestamp: 1750464000000
                isBuySide: true
    SpotPriceUpdate:
      name: SpotPriceUpdate
      title: Spot price update
      summary: A real-time latest-price event pushed by the server.
      contentType: application/json
      payload:
        $ref: '#/components/schemas/SpotPrice'
      examples:
        - name: price
          summary: Price update message
          payload:
            jsonrpc: '2.0'
            method: subscription
            params:
              subscription: '0xc'
              result:
                pair: eth_usd
                price: '3420.55'
                timestamp: 1750464000000
  schemas:
    JsonRpcSubscribe:
      type: object
      required:
        - jsonrpc
        - id
        - method
        - params
      properties:
        jsonrpc:
          type: string
          enum:
            - '2.0'
        id:
          type: integer
          description: Client-generated request identifier.
        method:
          type: string
          enum:
            - subscribe
        params:
          type: array
          description: >-
            First element is the channel/topic name (e.g. market:spot:trades);
            the second element is an optional filter object.
          items: {}
    JsonRpcUnsubscribe:
      type: object
      required:
        - jsonrpc
        - id
        - method
        - params
      properties:
        jsonrpc:
          type: string
          enum:
            - '2.0'
        id:
          type: integer
        method:
          type: string
          enum:
            - unsubscribe
        params:
          type: array
          description: The subscription id returned when the subscription was created.
          items:
            type: string
    SpotTrade:
      type: object
      description: Envelope of a streamed spot trade update.
      properties:
        jsonrpc:
          type: string
          enum:
            - '2.0'
        method:
          type: string
          enum:
            - subscription
        params:
          type: object
          properties:
            subscription:
              type: string
              description: The subscription id this update belongs to.
            result:
              type: object
              properties:
                exchange:
                  type: string
                pair:
                  type: string
                price:
                  type: string
                volume:
                  type: string
                timestamp:
                  type: integer
                  description: Event time in milliseconds since epoch.
                isBuySide:
                  type: boolean
    SpotPrice:
      type: object
      description: Envelope of a streamed spot price update.
      properties:
        jsonrpc:
          type: string
          enum:
            - '2.0'
        method:
          type: string
          enum:
            - subscription
        params:
          type: object
          properties:
            subscription:
              type: string
            result:
              type: object
              properties:
                pair:
                  type: string
                price:
                  type: string
                timestamp:
                  type: integer
                  description: Event time in milliseconds since epoch.