1. API
  2. Options Greeks
  3. Charm exposure

Options Greeks API, GET /charm/{ticker}

How much delta will dealers shed on SPY overnight from charm?

Charm exposure by strike: the delta that decays into tomorrow. Returns total, call and put charm exposure for the chosen expiration and the per-strike breakdown, plus the detailed rows with IV and open interest.

Run it on your ticker Download as Markdown Copy for your AI
ProPlan and above, from $55/mo
1MCP tool that calls it
2026-09-08Sample captured from the live endpoint

The answer, in one call

Units first,
then the request.

charm_exposure is delta shares per day (positive means dealers gain long delta as time passes).

Dealer convention: dealers short customer positions. Computed from open interest and per-contract charm.

curlBearer token from Account, then API Access
curl -H "Authorization: Bearer avmcp_YOUR_TOKEN" \
     "https://apexvol.com/api/mcp/data/charm/SPY"
Pythonrequests, nothing else
import requests

headers = {"Authorization": "Bearer avmcp_YOUR_TOKEN"}
r = requests.get("https://apexvol.com/api/mcp/data/charm/SPY", headers=headers)
r.raise_for_status()
data = r.json()["data"]
print(data["total_charm"])
In Claude, Cursor or ChatGPTthrough the MCP server, no code
You

How much delta decays out of SPY dealer books overnight?

The assistant calls get_charm_exposure and answers from the JSON below.

Tokens come with every paid or trial plan. Sign in and create one under Account, then API Access, or start a trial. Your ticker, your budget.

GET /api/mcp/data/charm/SPY200, application/json, captured 2026-09-08
{
  "success": true,
  "data": {
    "call_charm": 10023682.817,
    "charm_by_strike": [
      {
        "charm_exposure": 18249098.4446,
        "oi": 2372,
        "strike": 769
      },
      {
        "charm_exposure": 16525084.9209,
        "oi": 9544,
        "strike": 770
      },
      {
        "charm_exposure": -28726617.7301,
        "oi": 4457,
        "strike": 771
      }
    ],
    "data_status": "LIVE",
    "detailed": [
      {
        "charm": 17.7856,
        "charm_exposure": 10989702.8596,
        "iv": 0.0568,
        "oi": 6179,
        "strike": 770,
        "type": "C"
      },
      {
        "charm": 16.4499,
        "charm_exposure": 5535382.0614,
        "iv": 0.0615,
        "oi": 3365,
        "strike": 770,
        "type": "P"
      },
      {
        "charm": -67.7526,
        "charm_exposure": -9824127.9754,
        "iv": 0.0556,
        "oi": 1450,
        "strike": 771,
        "type": "C"
      }
    ],
    "dte": 0,
    "expiration": "2026-09-08",
    "put_charm": -4591755.8741,
    "stock_price": 770.25,
    "ticker": "SPY",
    "total_charm": 5431926.943
  }
}

Every response is wrapped as {"success": true, "data": {...}}. Lists in the sample are cut to a few rows so it fits on a page; the shape is exactly what your code receives.

Parameters

Bounded,
and the bounds are stated.

Out-of-range numbers are clamped to the documented range, never silently changed to something else. A missing required field returns 400 with the reason.

NameInDefaultRangeMeaning
ticker requiredpathany covered symbolThe underlying, upper case. Use /search to check coverage.
expirationquerynearestYYYY-MM-DD, a listed expirationWhich expiration to use. Defaults to the nearest one.

Field by field

What each
number means.

total_charm, call_charm, put_charm
Aggregate charm exposure.
charm_by_strike[].strike, charm_exposure, oi
The per-strike profile.
detailed[]
Per contract with charm, IV and OI.
dte, expiration, stock_price
Context.

Access, limits, errors

Before the
first call.

Plan
Pro Pro and above. Tokens are issued to paid and trial accounts from $55 a month; each endpoint follows the tier of its web feature. An endpoint above your plan answers 402 and names the plan it needs.
Auth
Bearer token, prefix avmcp_, created under Account, then API Access. Shown once, hashed at rest, rotates in one click. Always call https://apexvol.com, never www.
Limits
60 requests a minute and 1,000 an hour per token, plus a monthly allowance by plan. Every response carries the remaining counts in X-RateLimit-* headers; a 429 carries Retry-After in seconds.
Errors
401 no or revoked token; 429 Retry-After seconds; 403 Pro plan required; 424 data feed unavailable, retry. The full list with payload shapes is on the errors page.
Since
API 1.0. Units, bases and timestamps follow the conventions shared by every endpoint; changes are logged in the API changelog.
Machine-readable
This page as Markdown, the family as one file, the whole API as llms-full.txt or OpenAPI 3.1.

The same data, in plain English

Ask for it
in an MCP client.

Connect the ApexVol MCP server and the assistant calls get_charm_exposure by name. One URL, a sign-in, no token to paste.

Prompts that hit this endpointcopy one into Claude, Cursor or ChatGPT
You

How much delta decays out of SPY dealer books overnight?

You

Which strikes carry the most charm on QQQ?

You

Show charm exposure on NVDA for the nearest expiration.

More in the prompt library. Set the server up in Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, Windsurf or Gemini CLI.

Next

The rest of the family,
and the explainer behind it.

Options Greeks APILook a contract up by its delta instead of its strike. Pull a heatmap of any Greek across the whole surface. Sum a book. The Greeks arrive on the row, so nothing has to be re-derived. What is Delta? The Options Greek ExplainedWhat is delta in options? Learn how delta measures directional exposure and probability of profit, and how to use it for strike selection. get_charm_exposure in an MCP clientPrompts for Claude, Cursor and ChatGPT that call this tool.

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