Open Interest (v3)
ValueStandardPro
REQUIRED
The v3 Theta Terminal must be running to access data.
- Retrieve the last open interest message of an option contract.
- Open interest is reported around 06:30 ET every morning by OPRA and reflects the open interest at the of the previous trading day.
- You might need to change the default expiration date to a different date if it is past the current date.
- This endpoint will return no data if the market was closed for the day. Theta Data resets the snapshot cache at midnight ET every night.
Sample URL
Paste the URL below into your browser while the Theta Terminal is running.
Returns open interest for an option contract
http://localhost:25503/v3/option/snapshot/open_interest?symbol=AAPL&expiration=20260116&right=call&strike=275000Returns open interest for all option contracts
http://localhost:25503/v3/option/snapshot/open_interest?symbol=AAPL&expiration=*Query Parameters
symbolRequired -
The stock or index symbol, or underlying symbol for options.
Type: string
expirationRequired -
The expiration of the contract in YYYY-MM-DD or YYYYMMDD format, or * for all expirations.
Type: string
strike -
The strike price of the contract in dollars (ie 100.00 for $100.00), or * for all strikes.
Type: string (Default: *)
right -
The right (call or put) of the contract.
Type: string (Default: both)
Enumcall, put, both
format -
The format of the data when returned to the user.
Type: string (Default: csv)
Enumcsv, json, ndjson
Sample Code
py