# Options Contracts Index by Underlying

> Options Contracts Index by Underlying is a paid API for AI agents from marketdata.use.x402atlas.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Returns a full listing of all call and put options contracts for a given underlying stock ticker, including option tickers, strikes, expirations, and exercise styles.

## Facts

- Endpoint: GET https://marketdata.use.x402atlas.com/options-contracts
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/options-contracts-index-by-underlying-47081306
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EICnxBjw3z4JLfQehfbIN

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 options-contracts-index-by-underlying-47081306
```

Example prompt: Can you pull up all listed put options for AAPL — I want to see the full index of strikes and expirations, excluding expired contracts, up to 100 results?

## When to prefer this

Use this endpoint when you need a comprehensive index of all listed options contracts for a specific underlying — particularly when building an options chain, screening for specific strikes or expirations, or feeding downstream pricing/analytics workflows. Prefer this over a quote or OHLC endpoint when you need contract discovery rather than price data.

## Known failure modes

- Missing required 'underlying' parameter returns a 400 validation error
- Unknown or invalid ticker symbol may return an empty result set or 404
- Requesting more than 1000 results is capped at the max limit
- Network or upstream data provider outage may return 5xx errors
- Payment failure or insufficient USDC balance returns 402 Payment Required

## How this service works

Options contract index for an underlying — every listed call/put with option ticker, strike, expiration and exercise style.

## Output

A paginated list of options contracts for the given underlying, each with option ticker symbol, contract type (call/put), strike price, expiration date, and exercise style (American/European).

## 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": [
      "underlying"
     ],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 50000,
       "minimum": 1,
       "description": "Max results returned"
      },
      "underlying": {
       "type": "string",
       "description": "Underlying stock ticker, e.g. AAPL"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "queried_at",
      "underlying",
      "count",
      "contracts"
     ],
     "properties": {
      "count": {
       "type": "integer",
       "description": "Number of contracts returned."
      },
      "contracts": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "ticker",
         "strike_price"
        ],
        "properties": {
         "ticker": {
          "type": "string",
          "description": "Option ticker, e.g. O:AAPL260117C00150000."
         },
         "strike_price": {
          "type": "number"
         },
         "contract_type": {
          "enum": [
           "call",
           "put"
          ],
          "type": "string"
         },
         "exercise_style": {
          "type": "string",
          "description": "e.g. american, european."
         },
         "expiration_date": {
          "type": "string",
          "format": "date"
         },
         "primary_exchange": {
          "type": "string"
         },
         "underlying_ticker": {
          "type": "string"
         },
         "shares_per_contract": {
          "type": "number"
         }
        }
       },
       "description": "Listed option contracts for the underlying."
      },
      "queried_at": {
       "type": "string",
       "format": "date-time",
       "description": "UTC timestamp when this bridge queried the upstream."
      },
      "underlying": {
       "type": "string",
       "description": "Echo of the requested
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "contracts": [
   {
    "ticker": "O:AAPL260117C00150000",
    "strike_price": 150,
    "contract_type": "call",
    "exercise_style": "american",
    "expiration_date": "2026-01-17",
    "underlying_ticker": "AAPL",
    "shares_per_contract": 100
   }
  ],
  "queried_at": "2026-07-06T12:00:00Z",
  "underlying": "AAPL"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/options-contracts-index-by-underlying-47081306/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from marketdata.use.x402atlas.com](https://www.zero.xyz/host/marketdata.use.x402atlas.com/llms.txt)