# US Equity Options Expiration Calendar

> US Equity Options Expiration Calendar is a paid API for AI agents from market-calendar.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Returns all US monthly equity option expiration dates for a given year, flagging triple witching months and any Friday-to-Thursday shifts caused by market holidays.

## Facts

- Endpoint: GET https://market-calendar.x402tookit.com/options-expiry?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-equity-options-expiration-calendar-9d992c21
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jvLt1zXjYSRhCkQns-4g0

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-equity-options-expiration-calendar-9d992c21
```

Example prompt: Can you pull up all the monthly equity options expiration dates for 2025, and flag which ones are triple witching or shifted due to a market holiday?

## When to prefer this

Use this endpoint when you need structured, machine-readable US equity options expiration dates for a full year or specific month, including automatic holiday-shift detection and triple witching flags. Prefer this over manual calendar lookups or generic holiday APIs that don't account for options-specific rules like the Friday-to-Thursday shift or quarterly expirations.

## Known failure modes

- Year out of supported range (1990–2100) returns an error
- Missing required 'year' query parameter causes a 400-level error
- Month parameter outside 1–12 returns a validation error
- Service degraded flag set if holiday data source is unavailable
- Unexpected network timeout if upstream calendar data is slow

## How this service works

US monthly equity option expirations for a year: third Friday, moved to Thursday on a market holiday; flags triple witching.

## Output

Returns an array of monthly options expiration objects for the requested year (and optionally a single month), each containing: the expiration date, the canonical third Friday date, a boolean indicating if the date was shifted to Thursday due to a market holiday, and a boolean flagging quarterly/triple witching months. Also includes metadata such as year, data source, summary, disclaimer, and degraded-service flags.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "year"
     ],
     "properties": {
      "year": {
       "type": "integer",
       "description": "Year, 1990 to 2100"
      },
      "month": {
       "type": "integer",
       "description": "Optional single month 1 to 12"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "year": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "expirations": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "date": {
          "type": [
           "null",
           "string"
          ]
         },
         "month": {
          "type": [
           "null",
           "number"
          ]
         },
         "shifted": {
          "type": [
           "boolean",
           "null"
          ]
         },
         "quarterly": {
          "type": [
           "boolean",
           "null"
          ]
         },
         "thirdFriday": {
          "type": [
           "null",
           "string"
          ]
         }
        }
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-equity-options-expiration-calendar-9d992c21/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market-calendar.x402tookit.com](https://www.zero.xyz/host/market-calendar.x402tookit.com/llms.txt)