# Add Instruments to Watchlist

Adds instruments to a watchlist.

# OpenAPI definition

```json
{
  "info": {
    "title": "Webull OpenAPI Documentation",
    "description": "The Webull OpenAPI enables integration of trading APIs, market data for building trading applications and brokerage solutions. It supports HTTP-based historical and real-time market data and MQTT streaming via WebSocket/TCP, along with SDKs, secure authentication, and APIs for orders, accounts, and event contract trading.",
    "contact": {
      "name": "Webull Developer Support",
      "url": "https://www.webull.hk/en/help",
      "email": "webull-api-support@webull.com"
    },
    "version": "2.0",
    "x-logo": {
      "url": "static/png/logo.png"
    }
  },
  "servers": [
    {
      "url": "https://api.sandbox.webull.hk"
    }
  ],
  "path": "/market-data/watchlists/instruments/add",
  "method": "post",
  "tags": [
    "Watchlist"
  ],
  "description": "Adds instruments to a watchlist.",
  "operationId": "addWatchlistInstruments",
  "parameters": [
    {
      "name": "x-app-key",
      "in": "header",
      "description": "A unique identifier issued to a developer for accessing an application's API.",
      "required": true,
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      "examples": {
        "HMAC-SHA1": {
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        }
      }
    },
    {
      "name": "x-signature-nonce",
      "in": "header",
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      "schema": {
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    },
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      "required": true,
      "schema": {
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    }
  ],
  "requestBody": {
    "content": {
      "application/json": {
        "schema": {
          "required": [
            "instruments",
            "watchlist_id"
          ],
          "type": "object",
          "properties": {
            "watchlist_id": {
              "type": "string",
              "description": "Watchlist unique identifier",
              "example": "12345678"
            },
            "instruments": {
              "type": "array",
              "description": "List of instruments to add",
              "items": {
                "required": [
                  "category",
                  "symbol"
                ],
                "type": "object",
                "properties": {
                  "symbol": {
                    "type": "string",
                    "description": "Security symbol",
                    "example": "AAPL"
                  },
                  "category": {
                    "type": "string",
                    "description": "Security category",
                    "example": "US_STOCK",
                    "enum": [
                      "US_STOCK",
                      "HK_STOCK"
                    ]
                  },
                  "sort": {
                    "type": "integer",
                    "description": "Sort order within the watchlist (optional, used for update)",
                    "format": "int32",
                    "example": 1
                  }
                },
                "description": "Parameter for adding/updating/removing instruments in a watchlist.",
                "title": "WatchlistInstrumentParam"
              }
            }
          },
          "description": "Request parameters for adding instruments to a watchlist.",
          "title": "WatchlistAddInstrumentsParam"
        }
      }
    },
    "required": true
  },
  "responses": {
    "200": {
      "description": "OK",
      "content": {
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              "error_code": {
                "type": "string",
                "description": "Internal logic error code",
                "example": "SYSTEM_ERROR"
              },
              "message": {
                "type": "string",
                "description": "Error message",
                "example": "Internal Server Error"
              }
            }
          }
        }
      }
    }
  },
  "jsonRequestBodyExample": {
    "watchlist_id": "12345678",
    "instruments": [
      {
        "symbol": "AAPL",
        "category": "US_STOCK",
        "sort": 1
      }
    ]
  },
  "postman": {
    "name": "Add Instruments to Watchlist",
    "description": {
      "content": "Adds instruments to a watchlist.",
      "type": "text/plain"
    },
    "url": {
      "path": [
        "market-data",
        "watchlists",
        "instruments",
        "add"
      ],
      "host": [
        "{{baseUrl}}"
      ],
      "query": [],
      "variable": []
    },
    "header": [
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        "value": ""
      },
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          "type": "text/plain"
        },
        "key": "x-app-secret",
        "value": ""
      },
      {
        "disabled": false,
        "description": {
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          "type": "text/plain"
        },
        "key": "x-timestamp",
        "value": ""
      },
      {
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        "description": {
          "content": "(Required) Signature algorithm version, default is 1.0.",
          "type": "text/plain"
        },
        "key": "x-signature-version",
        "value": ""
      },
      {
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        "description": {
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          "type": "text/plain"
        },
        "key": "x-signature-algorithm",
        "value": ""
      },
      {
        "disabled": false,
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          "type": "text/plain"
        },
        "key": "x-signature-nonce",
        "value": ""
      },
      {
        "disabled": false,
        "description": {
          "content": "(Required) An access token is a credential that represents the authorization granted to a client (e.g., a user or an application) to access specific protected resources on behalf of a user, without needing to share their password.",
          "type": "text/plain"
        },
        "key": "x-access-token",
        "value": ""
      },
      {
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        "description": {
          "content": "(Required) API interface version. Supported values: `v2`, `v3`.",
          "type": "text/plain"
        },
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        "value": ""
      },
      {
        "disabled": false,
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          "type": "text/plain"
        },
        "key": "x-signature",
        "value": ""
      },
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        "key": "Content-Type",
        "value": "application/json"
      },
      {
        "key": "Accept",
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    ],
    "method": "POST",
    "body": {
      "mode": "raw",
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}
```