API — Options chain & OPEX

Per-expiry summary

One row per active expiry with the metrics most useful for chain-wide screening:

Pre-computed every 30s — ATM IV, 25Δ skew, put/call 25Δ IVs, PCR, call/put/total OI, net GEX.

Added by v2 (OPEX enrichment, on-the-fly):

type — daily | weekly | monthly | quarterly (Deribit token parsed; quarterlies are last Fridays of Mar/Jun/Sep/Dec).
is_anchor — true for monthly + quarterly anchors.
expiry_date — ISO date when the token parses cleanly.
notional_oi_usd — total_oi × spot_price (each contract is 1 unit of underlying on Deribit-style chains).
max_pain — {strike, value} from a per-expiry max-pain pass over the latest chain snapshot. Cached 30s, shared with /v2/gex/max-pain and /v2/options/opex.

GET

options

expiry-summary

Per-expiry IV / skew / PCR / OI / GEX (with OPEX enrichment)

curl --request GET \
  --url https://api.example.com/options/expiry-summary \
  --header 'X-API-Key: <api-key>'

{
  "data": {
    "expiries": [
      {
        "expiry": "<string>",
        "is_anchor": true,
        "dte": 123,
        "atm_iv": 123,
        "skew_25d": 123,
        "put_25d_iv": 123,
        "call_25d_iv": 123,
        "pcr": 123,
        "call_oi": 123,
        "put_oi": 123,
        "total_oi": 123,
        "net_gex": 123,
        "expiry_date": "<string>",
        "notional_oi_usd": 123,
        "max_pain": {
          "strike": 123,
          "value": 123
        }
      }
    ],
    "anchor_count": 123,
    "type_counts": {
      "daily": 0,
      "weekly": 0,
      "monthly": 0,
      "quarterly": 0
    }
  },
  "meta": {
    "version": "<string>",
    "timestamp": "<string>",
    "request_id": "<string>",
    "symbol": "<string>",
    "spot_price": 123,
    "computed_at": "<string>",
    "freshness_seconds": 123,
    "source": [
      "<string>"
    ],
    "exchanges_filtered": [
      "<string>"
    ],
    "rate_limit": {},
    "extra": {}
  },
  "success": true
}

One row per active expiry with ATM IV, 25Δ skew, PCR, OI, net GEX, plus OPEX enrichment (type, is_anchor, expiry_date, notional_oi_usd, max_pain).

OPEX calendar

IV suite

Authorizations

X-API-Key

string

header

required

Your BackQuant API key (same key as v1)

Headers

X-API-Key

string | null

Query Parameters

symbol

enum<string>

default:BTCUSDT

Trading symbol: BTCUSDT, ETHUSDT, SOLUSDT, or HYPEUSDT.

Available options:

BTCUSDT,

ETHUSDT,

SOLUSDT,

HYPEUSDT

Response

Successful Response

data

ExpirySummaryData · object