Screeners API, GET /vol-arb-scan
Are there mispriced butterflies or skew trades on SPY right now?
Cross-strike checks: butterfly mispricings, skew trades, calendars and parity violations. Scans the chain of one ticker for butterflies priced below fair, skew trades between ATM and OTM IV, calendar-spread opportunities and put-call parity violations, with the edge for each.
The answer, in one call
Units first,
then the request.
Option prices in dollars; IVs in percentage points (iv_unit); edge_pct in percent.
Model fair values from the chain IV; each row states its strategy and type.
curl -H "Authorization: Bearer avmcp_YOUR_TOKEN" \
"https://apexvol.com/api/mcp/data/vol-arb-scan"import requests
headers = {"Authorization": "Bearer avmcp_YOUR_TOKEN"}
r = requests.get("https://apexvol.com/api/mcp/data/vol-arb-scan", headers=headers)
r.raise_for_status()
data = r.json()["data"]
print(data["total_opportunities"])Scan SPY for volatility arbitrage.
The assistant calls scan_volatility_arb and answers from the JSON below.{
"success": true,
"data": {
"butterfly_mispricings": [
{
"butterfly_cost": 0.655,
"edge": "1326.7% potential return",
"edge_pct": 1326.7176,
"expiration": "2026-09-15",
"lower_strike": 760.0,
"max_profit": 9.345,
"middle_strike": 765.0,
"option_type": "CALL",
"risk_reward": 14.2672,
"strategy": "Buy call butterfly at 765.0",
"ticker": "SPY",
"type": "BUTTERFLY_VALUE",
"upper_strike": 770.0
},
{
"butterfly_cost": 0.765,
"edge": "1107.2% potential return",
"edge_pct": 1107.1895,
"expiration": "2026-09-15",
"lower_strike": 775.0,
"max_profit": 9.235,
"middle_strike": 780.0,
"option_type": "CALL",
"risk_reward": 12.0719,
"strategy": "Buy call butterfly at 780.0",
"ticker": "SPY",
"type": "BUTTERFLY_VALUE",
"upper_strike": 785.0
},
{
"butterfly_cost": 0.77,
"edge": "1098.7% potential return",
"edge_pct": 1098.7013,
"expiration": "2026-09-15",
"lower_strike": 765.0,
"max_profit": 9.23,
"middle_strike": 770.0,
"option_type": "CALL",
"risk_reward": 11.987,
"strategy": "Buy call butterfly at 770.0",
"ticker": "SPY",
"type": "BUTTERFLY_VALUE",
"upper_strike": 775.0
}
],
"calendar_spreads": [],
"put_call_parity_violations": [],
"skew_trades": [
{
"atm_iv": 9.11,
"atm_strike": 770.0,
"edge": "12.5 IV points of skew",
"expiration": "2026-09-15",
"iv_unit": "percentage_points",
"otm_iv": 21.58,
"otm_strike": 710.0,
"skew": 12.47,
"skew_pct": 136.8825,
"strategy": "Sell OTM put skew",
"ticker": "SPY",
"type": "PUT_SKEW_TRADE"
},
{
"atm_iv": 10.1,
"atm_strike": 770.0,
"edge": "11.7 IV points of skew",
"expiration": "2026-09-16",
"iv_unit": "percentage_points",
"otm_iv": 21.81,
"otm_strike": 710.0,
"skew": 11.71,
"skew_pct": 115.9406,
"strategy": "Sell OTM put skew",
"ticker": "SPY",
"type": "PUT_SKEW_TRADE"
},
{
"call_iv": 14.46,
"call_strike": 830.0,
"edge": "7.3 IV points asymmetry",
"expiration": "2026-09-16",
"iv_unit": "percentage_points",
"put_iv": 21.81,
"put_strike": 710.0,
"skew_asymmetry": 7.35,
"strategy": "Sell put / Buy call",
"ticker": "SPY",
"type": "RISK_REVERSAL"
}
],
"success": true,
"ticker": "SPY",
"timestamp": "2026-09-08T08:07:56.079469",
"total_opportunities": 9
}
}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 | query | SPY | symbol | Which chain to scan. |
Field by field
What each
number means.
butterfly_mispricings[].lower_strike, middle_strike, upper_strike, butterfly_cost, edge- Butterflies.
skew_trades[].atm_iv, otm_iv, skew, strategy- Skew trades.
calendar_spreads[], put_call_parity_violations[]- The other checks.
total_opportunities- Count.
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 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;403Pro 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 scan_volatility_arb by name. One URL, a sign-in, no token to paste.
Scan SPY for volatility arbitrage.
YouAny mispriced butterflies on NVDA this week?
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More in the prompt library. Set the server up in Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, Windsurf or Gemini CLI.
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From $55 a month, tier-matched: your token queries the data your plan includes and Pro unlocks the full surface.
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