- API
- Implied volatility
- Term structure
Implied volatility API, GET /term-structure/{ticker}
Is SPY's IV curve in contango or inverted, and what move does each expiration price?
At-the-money IV by expiration, with the straddle-implied move for each one. One row per expiration with the ATM strike, ATM IV, straddle price and the one and two sigma bounds, so the shape of the curve and the priced move at each date come back in a single array.
The answer, in one call
Units first,
then the request.
atm_iv is annualised percentage points. expected_move_dollar is dollars, expected_move_pct is percent of spot. straddle_* are option prices in dollars.
ATM IV is the chain IV at the strike nearest spot. expected_move comes from the straddle price; iv_expected_move is the sigma-based figure from IV and time.
curl -H "Authorization: Bearer avmcp_YOUR_TOKEN" \
"https://apexvol.com/api/mcp/data/term-structure/SPY"import requests
headers = {"Authorization": "Bearer avmcp_YOUR_TOKEN"}
r = requests.get("https://apexvol.com/api/mcp/data/term-structure/SPY", headers=headers)
r.raise_for_status()
data = r.json()["data"]
print(data["as_of"])Is SPY's term structure in contango or backwardation right now?
The assistant calls get_term_structure and answers from the JSON below.{
"success": true,
"data": {
"as_of": "2026-09-08T07:48:58.063902",
"iv_units": "percentage_points",
"stock_price": 770.25,
"term_structure": [
{
"atm_iv": 5.92,
"atm_strike": 770.0,
"dte": 0,
"expected_move_dollar": 3.82,
"expected_move_pct": 0.5,
"expiration": "2026-09-08",
"iv_expected_move_dollar": 0.0,
"iv_expected_move_pct": 0.0,
"lower_1sigma": 766.43,
"lower_2sigma": 762.61,
"straddle_call": 1.98,
"straddle_price": 3.82,
"straddle_put": 1.84,
"upper_1sigma": 774.07,
"upper_2sigma": 777.89
},
{
"atm_iv": 7.09,
"atm_strike": 770.0,
"dte": 1,
"expected_move_dollar": 5.12,
"expected_move_pct": 0.66,
"expiration": "2026-09-09",
"iv_expected_move_dollar": 2.86,
"iv_expected_move_pct": 0.37,
"lower_1sigma": 765.14,
"lower_2sigma": 760.02,
"straddle_call": 2.66,
"straddle_price": 5.12,
"straddle_put": 2.45,
"upper_1sigma": 775.36,
"upper_2sigma": 780.48
},
{
"atm_iv": 8.06,
"atm_strike": 770.0,
"dte": 2,
"expected_move_dollar": 6.38,
"expected_move_pct": 0.83,
"expiration": "2026-09-10",
"iv_expected_move_dollar": 4.6,
"iv_expected_move_pct": 0.6,
"lower_1sigma": 763.88,
"lower_2sigma": 757.5,
"straddle_call": 3.3,
"straddle_price": 6.38,
"straddle_put": 3.08,
"upper_1sigma": 776.62,
"upper_2sigma": 783.0
}
],
"ticker": "SPY"
}
}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.
| Name | In | Default | Range | Meaning |
|---|---|---|---|---|
ticker required | path | any covered symbol | The underlying, upper case. Use /search to check coverage. | |
num_expirations | query | 8 | 1 to 20 | How many expirations to return, nearest first. |
Field by field
What each
number means.
term_structure[].expiration, dte- The expiration and days to it.
term_structure[].atm_iv- At-the-money implied vol for that expiration.
term_structure[].straddle_price- ATM call plus put, the market's price for the move.
term_structure[].expected_move_pct, expected_move_dollar- The priced move to that date.
term_structure[].upper_1sigma, lower_1sigma- The one-sigma range from the straddle.
as_of- Trade date of the chain.
Access, limits, errors
Before the
first call.
- Plan
- Premium Premium 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 callhttps://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 carriesRetry-Afterin seconds. - Errors
401no or revoked token;429Retry-After seconds;403Premium plan required;424data 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_term_structure by name. One URL, a sign-in, no token to paste.
Is SPY's term structure in contango or backwardation right now?
YouWhat move is priced into NVDA for each of the next 6 expirations?
YouShow the IV term structure for AAPL and flag any inversion.
More in the prompt library. Set the server up in Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, Windsurf or Gemini CLI.
Included with
every paid plan.
From $55 a month, tier-matched: your token queries the data your plan includes and Pro unlocks the full surface.
Real market data, not a sandbox. See it live on AAPL.