option_history_open_interest

FreeValueStandardPro

Retrieve open interest history for an option contract.

Code Example

Rust

let data = tdx.option_history_open_interest("SPY", "20260417", "550", "C", "20260315").await?;
for t in &data {
    println!("date={} open_interest={}", t.date, t.open_interest);
}

Python

data = tdx.option_history_open_interest("SPY", "20260417", "550", "C", "20260315")
for t in data:
    print(f"date={t.date} open_interest={t.open_interest}")

TypeScript

const data = tdx.optionHistoryOpenInterest('SPY', '20260417', '550', 'C', '20260315');
for (const t of data) {
    console.log(`date=${t.date} open_interest=${t.open_interest}`);
}

C++

auto data = client.option_history_open_interest("SPY", "20260417", "550", "C", "20260315");
for (const auto& t : data) {
    printf("date=%d open_interest=%d\n", t.date, t.open_interest);
}

Parameters

symbolstringrequired

Underlying symbol

expirationstringrequired

Expiration date in YYYYMMDD format

strikestringrequired

Strike price in dollars as a string

rightstringrequired

"C" for call, "P" for put

datestringrequired

Date in YYYYMMDD format

max_dteintoptional

Maximum days to expiration

strike_rangeintoptional

Strike range filter

Response

open_interestint

Open interest

datestring

Date

Sample Response

[
  {"date": 20260401, "open_interest": 28},
  {"date": 20260402, "open_interest": 32}
]

Daily open interest for a specific option contract.

Notes

• Open interest is typically reported once per day based on the previous day's settlement.