Option Flat File Open Interest (v3)

Pro

GET

http://127.0.0.1:25503/v3/option/flat_file/open_interest

REQUIRED

The v3 Theta Terminal must be running to access data.

Bulk download all option open interest ticks for a given date as a CSV stream. Returns one row per tick, grouped by contract. Requires a Professional options subscription.

Expected response time: ~1 minute. Expected file size: ~50 MB.

Only the 7 most recent calendar days are available; data for the previous day is typically ready by 12:30-1am ET. See Flat Files Getting Started for details, or contact sales for more history.

Sample URL

Paste the URL below into your browser while the Theta Terminal is running.

Returns all option open interest ticks for a given date

http://127.0.0.1:25503/v3/option/flat_file/open_interest?date=20260803

Click to open in browser (HTML)

http://127.0.0.1:25503/v3/option/flat_file/open_interest?date=20260803&format=html

Query Parameters

dateRequired  -

The date to fetch data for.

Type: string

format  -

The format of the data when returned to the user.

Type: string (Default: csv)

Enumcsv, json, ndjson, html

Responses

CSV stream of all option open interest ticks for the given date

Content-Type

array of:

Sample Code

Python