---
title: "Api V2 Gex Premium Surface Get"
method: GET
path: "/api/v2/gex/premium_surface"
tags: ["GEX (v2)", "Beta (v2)"]
---

# Api V2 Gex Premium Surface Get

`GET /api/v2/gex/premium_surface`

## Request

- Base URL: `https://api.zerogex.io` (the document declares no server; this is the origin it was published from)
- URL: `https://api.zerogex.io/api/v2/gex/premium_surface`
- Auth: HTTP bearer

Return the options premium (extrinsic-value) surface for one option type.

**Beta** — contract may change. x = strike, y = expiration, z = extrinsic
(premium − intrinsic, clamped at 0).

## Query parameters

- `symbol` string: Underlying symbol (e.g. SPY)
- `option_type` 'C' | 'P': Option type: C (call) or P (put)
- `dte_max` integer: Max days to expiration to include
- `strike_count` integer: Number of strikes centered on spot

## Response `200`

Successful Response

- EnvelopePremiumSurfaceResponse
  - `data` PremiumSurfaceResponse, required
    - `symbol` string, required
    - `option_type` 'C' | 'P', required
    - `spot_price` number, required
    - `timestamp` string, date-time, required
    - `expirations` string[], required
    - `strikes` number[], required
    - `surface` SrcApiRoutersPremiumSurfaceExpirationSlice[], required
      - `expiration` string, date, required
      - `dte` integer, required
      - `strikes` StrikePremium[], required
        - `strike` number, required
        - `premium` number, nullable
        - `intrinsic` number, nullable
        - `extrinsic` number, nullable
    - `available_max_dte` integer, required
    - `available_strike_count` integer, required
  - `freshness` Freshness, required: The v2 freshness envelope. Present on every ``/api/v2/*`` response.
    - `evaluated_at` string, date-time, required: When the API evaluated this response (server wall clock, UTC). Endpoint-health signal: advances on every request even when the underlying data is unchanged.
    - `generated_at` string, date-time, required: When the served data was computed. Equals the snapshot stamp for cycle-backed endpoints, or evaluated_at for endpoints computed on demand for this request.
    - `source_timestamp` string, date-time, nullable: Timestamp of the upstream market observation the payload derives from. This is what freshness_status is measured against. Null when the endpoint has no upstream feed or returned no rows.
    - `latest_event_at` string, date-time, nullable: Newest event timestamp present in the payload (last bar, last trade, last scored row). Best-effort on very large responses, which are sampled rather than fully walked.
    - `age_seconds` number, nullable: evaluated_at - source_timestamp, in seconds. Null when source_timestamp is null.
    - `market_session_status` string, required: pre-market | regular | after-hours | closed (US/Eastern).
    - `expected_update_cadence` string, nullable: ISO-8601 duration for how often this endpoint's data is expected to change right now, e.g. PT60S. Null means no updates are expected (weekend, holiday, or a feed that only runs during the session).
    - `expected_update_cadence_seconds` number, nullable: expected_update_cadence as a number of seconds.
    - `cadence_profile` string, required: Identifier of the cadence class this endpoint belongs to, e.g. analytics_cycle. Stable across releases; the seconds behind it may be retuned.
    - `stale_after` string, date-time, nullable: Instant after which this payload should be treated as stale. Null whenever expected_update_cadence is null.
    - `freshness_status` 'fresh' | 'aging' | 'stale' | 'session_closed' | 'static' | 'unknown', required: The rolled-up freshness verdict for one response. ``fresh`` ``source_timestamp`` is within one expected update cadence. ``aging`` Past one cadence but not yet past ``stale_after`` — the grace band that absorbs normal cycle jitter. Not an error; a client that polls faster than the cadence sees this routinely. ``stale`` Past ``stale_after`` while updates *were* expected. This is the actionable state: the feed behind this endpoint is late. ``session_closed`` A feed-backed endpoint whose feed is not due to produce anything right now (weekend, holiday, or a feed that only runs during the session). The payload is the last good value — deliberately NOT reported as ``stale``, because an overnight consumer polling a closed market is not observing a fault and should not page on it. ``static`` The endpoint is not feed-backed at all: completed history, or a result computed from the caller's own inputs. Age here carries no health meaning and never becomes a fault. ``unknown`` No source timestamp could be resolved from the payload (e.g. a pure calculator, an admin endpoint, or an empty result set). A consumer should fall back to ``evaluated_at`` for endpoint health and make no claim about data age.

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/zerogex/apis/zerogex-api.md) · [All operations](https://skmtc.dev/zerogex/apis/zerogex-api/llms.txt) · [OpenAPI document](https://skmtc.dev/zerogex/apis/zerogex-api/revisions/753b26bf0592?raw)