Options · Chains

Options chain open interest

Open interest of every contract of an underlying.

GET/v1/options/chain/open-interestoptionsChainOpenInterest

API Developer Overnight data: API Pro Paginated Dataset: options

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Example request
Parameters
Response
Example response
Related

The open interest most recently published for every contract. It is published once a day, before the open, and reflects the previous session's close. Rows are ordered by date_of_expiry, strike, contract_type (call before put) and paginated with cursor_id; a page reads one expiration at a time and may hold fewer rows than limit. When no date_of_expiry is given the chain covers the expirations within max_dte days (default 30). Reads of an underlying that trades overnight (SPX, SPXW, XSP, VIX, VIXW, RUT, RUTW) outside weekday 09:30-16:15 ET, the curb session included, require the overnight entitlement; during the regular session, parts of a contract whose latest quote or trade is from the overnight session are null for plans without it (listed in meta.coverage.missing and counted in meta.coverage.withheld).

Example request

curl -sS --get "https://api.ordermap.si/v1/options/chain/open-interest" \
  -H "Authorization: Bearer $ORDERMAP_API_KEY" \
  --data-urlencode underlying_symbol=SPXW

const params = new URLSearchParams({
  underlying_symbol: "SPXW",
});
const res = await fetch(`https://api.ordermap.si/v1/options/chain/open-interest?${params}`, {
  headers: { Authorization: `Bearer ${process.env.ORDERMAP_API_KEY}` },
});
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
const { data, meta } = await res.json();
console.log(data, meta.coverage);
// Paginated: repeat with cursor_id set to pagination.next_cursor_id until it is null.

Set ORDERMAP_API_KEY to your key. Replace the dates with a recent trading date.

Parameters

8 parameters, 1 required.

Parameter	Type and limits	Description
`underlying_symbol`queryrequired	stringat most 8 characterspattern ^[A-Za-z][A-Za-z0-9.]{0,7}$	Underlying: an option root (SPXW, QQQ, NDXP ...) or an index family: SPX covers the SPX and SPXW roots, NDX the NDX and NDXP roots, RUT the RUT and RUTW roots. Rows name the root of each contract.
`date_of_expiry`queryoptional	stringdate	Only this expiration, YYYY-MM-DD.
`contract_type`queryoptional	stringcallput	Only calls or only puts.
`min_strike`queryoptional	number> 0max 99999.999	Lowest strike to return, in dollars.
`max_strike`queryoptional	number> 0max 99999.999	Highest strike to return, in dollars.
`max_dte`queryoptional	integermin 0max 1000	Without date_of_expiry: include expirations up to this many days away (default 30).
`limit`queryoptional	integerdefault 1000min 1max 2500	Maximum rows to return.
`cursor_id`queryoptional	stringat most 1024 characters	Opaque cursor returned as pagination.next_cursor_id; resumes the same query on the next page.

Response

Status	Meaning	Body
`200`	Successful response.	Schema below
`400`	Invalid, unknown or repeated parameters, or an invalid cursor.	Error object
`401`	Missing or invalid API key.	Error object
`403`	The plan, dataset release or account state does not allow this request.	Error object
`422`	The request is valid but no data exists for it.	Error object
`429`	Rate limit, burst limit or cooldown; wait Retry-After seconds.Retry-After	Error object
`500`	Internal error.	Error object
`503`	Data temporarily unavailable; retry after Retry-After seconds.Retry-After	Error object
`504`	The request timed out.	Error object

Authenticated responses carry the X-RateLimit-* headers (see rate limits); 429 and 503 add Retry-After.

200 response body

dataarray<object>required7 fields inside
- contract_typestringrequiredCall or put.callput
- date_of_expirystringdaterequiredExpiration date.
- open_interestintegerrequiredOpen contracts.
- option_symbolstringrequiredOCC option symbol of the contract: root padded to six characters, expiration YYMMDD, C or P and the strike in thousandths over eight digits.
- strikenumberrequiredStrike price in dollars.
- timestampintegerunix-msrequiredTime the open interest was published. Unix epoch milliseconds (UTC).
- underlying_symbolstringrequiredOption root of the contract.
metaobjectrequiredMeta object
paginationobjectrequiredPagination object

Example response

{
  "data": [
    {
      "option_symbol": "SPXW  261016C05800000",
      "underlying_symbol": "SPXW",
      "date_of_expiry": "2026-10-16",
      "strike": 5800,
      "contract_type": "call",
      "timestamp": 1792146600000,
      "open_interest": 4321
    }
  ],
  "meta": {
    "as_of": 1760659200123,
    "coverage": {
      "complete": true
    },
    "delay_ms": 0,
    "delayed": false,
    "request_id": "0199f0c2-5a1e-7c3b-9d4e-2b6f8a1c3d5e",
    "source": "opra"
  },
  "pagination": {
    "count": 1,
    "has_more": false,
    "limit": 1000,
    "next_cursor_id": null,
    "next_url": null
  }
}

Values are illustrative. Missing values are null, never 0.

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