US Equities Trading Halts

GET https://api.devalgoseek.com/api/v1/data/us-equity-ref/eq-trading-halts#

The U.S. Equities Trading Halts dataset provides comprehensive reference information on trading halt events affecting U.S. exchange-listed equities. It consolidates halt activity across all U.S. equity exchanges, delivering a unified view of market suspensions and resumptions. Each record includes the halt reason code, halt initiation timestamp, resumption timestamp, and security-level metadata, enabling precise measurement of halt duration and clear attribution of regulatory or exchange-initiated actions. The dataset captures a wide range of halt scenarios, including regulatory halts, volatility-related pauses, news-pending halts, and operational interruptions. This dataset is designed to support market event analysis, trading system controls, compliance monitoring, and historical research, where accurate identification and timing of trading halts are critical.

For more details, please refer to the dataset documentation: US Equities Trading Halts Guide.

Advanced Filtering

You can provide one or multiple filter expressions based on the dataset's columns to narrow down the results. For example, StartDate.gt=2023-01-01&StartDate.lt=2023-12-31, Ticker=AAPL.

Please refer to the Advanced Filtering Guide for the extensive reference.

Request#

Query Parameters#

sort Sort

Sorting criteria for the results. Provide a column name with optional prefix '+' for ascending order, or prefix with '-' for descending order. Multiple sorting fields may be supported depending on the dataset. If sort prefix is not provided, the ascending order is applied.

columns Columns

A comma-separated list of columns to include in the response. Use this parameter to select only specific fields from the dataset. If not provided, all available columns will be returned.

offset Offset

Possible values: >= 0

Number of records to skip before returning results. To be used with the limit parameter for pagination. If not provided, defaults to 0.

Default value: 0

Example: 100

limit Limit

Possible values: >= 0 and <= 100000

Maximum number of records to return. Used to control response size and pagination. If not provided, a default limit is applied by the server.

Default value: 10000

Example: 100

response_format ResponseFormat

Possible values: [json, csv, csv_gzip]

The type of the data to return

Default value: json

Examples:

JSON
CSV Gzip

JSON format (default)

Example: json

Compressed CSV format

Example: csv_gzip

Responses#

JSON, CSV file, or gzip-compressed CSV file, depending on the value of response_format query parameter

application/json
text/csv
application/gzip

Schema
Example (auto)

Schema

data object[]required

Array [

Datedate

The trading day

Example: 2025-08-14

SecIdinteger

Algoseek security identifier

Example: 8139569

ASIDinteger

A unique identifier for a security

Example: 1010000000025154

Symbolstring

Ticker symbol of the security, such as AAPL, MSFT, etc.

Example: BOWN

OrigExchstring

Exchange on which the trading halt originated. Usually a halt message is originated from the security primary listing exchange.

Example: Nasdaq

Planstring

Plan under which the trading action was initiated (CTA or UTP).

Example: UTP

EodStatusstring

Plan under which the trading action was initiated (CTA or UTP).

Example: Halted

HaltDatedate

Date when the trading halt or pause began.

Example: 2025-07-15

HaltTimeExchstring

Timestamp (nanosecond accuracy) provided by the originating exchange when the trading halt or pause was activated.

Example: 17:45:19.241810737

HaltTimeSipstring

Timestamp (nanosecond accuracy) provided by the SIP when the halt message was disseminated.

Example: 17:45:19.241868285

CtaLastPricePreHaltnumber

The Last Price represents the last price for that security either on a Consolidated or an indivisual Participant bases at the time the halt message is disseminated.

Example:

ResumeDatedate

Date when trading of the security resumed.

Example:

UtpQuoteResumeTimeExchstring

Timestamp (nanosecond accuracy) provided by the originating exchange when quotation for the security resumed (UTP plan issues only).

Example:

UtpQuoteResumeTimeSipstring

Timestamp (nanosecond accuracy) provided by the SIP when the quotation resumption message was disseminated.

Example:

TradeResumeTimeExchstring

Timestamp (nanosecond accuracy) provided by the originating exchange when the trading halt was deactivated and trading resumed.

Example:

TradeResumeTimeSipstring

Timestamp (nanosecond accuracy) provided by the SIP when the trading resumption message was disseminated.

Example:

AsNormRsnCodestring

Algoseek normalized reason code(s) for the trading action. If multiple reasons exist, codes are separated by semi-colons.

Example:

AsNormRsnstring

Algoseek normalized reason description(s) for the trading action. If multiple reasons exist, descriptions are separated by semi-colons.

Example:

ExchRsnCodestring

Exchange-provided reason code(s) for the trading halt. If multiple codes are disseminated, codes are separated by semi-colons.

Example:

HaltCaseSeqinteger

Sequence number of the trading halt case, tracking the number of halts for a security during a trading session.

Example: 1

TotalMessagesinteger

Total number of messages sent during the trading halt case.

Example: 1

]

pagination objectrequired

offsetinteger

The number of records skipped to fetch the current page

Default value: 0

limitintegerrequired

The maximum number of records in the current page

next_offsetinteger

The number of records to skip to fetch the next page

{
  "data": [
    {
      "Date": "2025-08-14",
      "SecId": 8139569,
      "ASID": 1010000000025154,
      "Symbol": "BOWN",
      "OrigExch": "Nasdaq",
      "Plan": "UTP",
      "EodStatus": "Halted",
      "HaltDate": "2025-07-15",
      "HaltTimeExch": "17:45:19.241810737",
      "HaltTimeSip": "17:45:19.241868285",
      "CtaLastPricePreHalt": "",
      "ResumeDate": "",
      "UtpQuoteResumeTimeExch": "",
      "UtpQuoteResumeTimeSip": "",
      "TradeResumeTimeExch": "",
      "TradeResumeTimeSip": "",
      "AsNormRsnCode": "",
      "AsNormRsn": "",
      "ExchRsnCode": "",
      "HaltCaseSeq": 1,
      "TotalMessages": 1
    }
  ],
  "pagination": {
    "limit": 1000,
    "next_offset": 2000,
    "offset": 1000
  }
}

Schema
Example (auto)

Schema

stringbinary

"string"

Schema
Example (auto)

Schema

stringbinary

"string"

Validation Error

application/json

Schema
Example (auto)

Schema

detail object[]

Array [

loc object[]required

Array [

anyOf

string
integer

string

]

msgstringrequired

typestringrequired

inputInput

ctxobject

]

{
  "detail": [
    {
      "loc": [
        "string",
        0
      ],
      "msg": "string",
      "type": "string",
      "ctx": {}
    }
  ]
}

Authorization: X-API-KEY#

name: X-API-KEYtype: apiKeyin: header

HTTPCLIENT
RESTSHARP

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Get, "https://api.devalgoseek.com/api/v1/data/us-equity-ref/eq-trading-halts");
request.Headers.Add("Accept", "application/json");
request.Headers.Add("X-API-KEY", "<X-API-KEY>");
var response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

Response

Click the Send API Request button above and see the response here!

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