Expiry

The Expiry API allows you to retrieve expiry dates for F&O (Futures and Options) instruments for a given underlying symbol. This API helps you get all available expiry dates for futures or options contracts of a specific underlying asset.

Endpoint

Local Host   :  POST http://127.0.0.1:5000/api/v1/expiry
Ngrok Domain :  POST https://<your-ngrok-domain>.ngrok-free.app/api/v1/expiry
Custom Domain:  POST https://<your-custom-domain>/api/v1/expiry

Request Format

Headers

• Content-Type: application/json

Body Parameters

Parameter	Type	Required	Description
apikey	string	Yes	Your OpenAlgo API key for authentication
symbol	string	Yes	Underlying symbol (e.g., NIFTY, BANKNIFTY, RELIANCE)
exchange	string	Yes	Exchange code (NFO, BFO, MCX, CDS)
instrumenttype	string	Yes	Type of instrument - "futures" or "options"

Supported Exchanges and Instruments

Exchange	Futures	Options	Examples
NFO	✓	✓	NIFTY, BANKNIFTY, RELIANCE
BFO	✓	✓	SENSEX, BANKEX
MCX	✓	✓	GOLD, SILVER, CRUDEOIL
CDS	✓	✓	USDINR, EURINR

Request and Response Examples

NIFTY Futures (NFO)

Request:

{
    "apikey": "openalgo-api-key",
    "symbol": "NIFTY",
    "exchange": "NFO",
    "instrumenttype": "futures"
}

Response:

{
    "data": [
        "31-JUL-25",
        "28-AUG-25",
        "25-SEP-25"
    ],
    "message": "Found 3 expiry dates for NIFTY futures in NFO",
    "status": "success"
}

NIFTY Options (NFO)

Request:

{
    "apikey": "openalgo-api-key",
    "symbol": "NIFTY",
    "exchange": "NFO",
    "instrumenttype": "options"
}

Response:

{
    "data": [
        "10-JUL-25",
        "17-JUL-25",
        "24-JUL-25",
        "31-JUL-25",
        "07-AUG-25",
        "28-AUG-25",
        "25-SEP-25",
        "24-DEC-25",
        "26-MAR-26",
        "25-JUN-26",
        "31-DEC-26",
        "24-JUN-27",
        "30-DEC-27",
        "29-JUN-28",
        "28-DEC-28",
        "28-JUN-29",
        "27-DEC-29",
        "25-JUN-30"
    ],
    "message": "Found 18 expiry dates for NIFTY options in NFO",
    "status": "success"
}

GOLD Futures (MCX)

Request:

{
    "apikey": "openalgo-api-key",
    "symbol": "GOLD",
    "exchange": "MCX",
    "instrumenttype": "futures"
}

Response:

{
    "data": [
        "05-AUG-25",
        "03-OCT-25",
        "05-DEC-25",
        "05-FEB-26",
        "02-APR-26",
        "05-JUN-26"
    ],
    "message": "Found 6 expiry dates for GOLD futures in MCX",
    "status": "success"
}

USDINR Futures (CDS)

Request:

{
    "apikey": "openalgo-api-key",
    "symbol": "USDINR",
    "exchange": "CDS",
    "instrumenttype": "futures"
}

Response:

{
    "data": [
        "11-JUL-25",
        "18-JUL-25",
        "25-JUL-25",
        "29-JUL-25",
        "01-AUG-25",
        "08-AUG-25",
        "14-AUG-25",
        "22-AUG-25",
        "26-AUG-25",
        "29-AUG-25",
        "04-SEP-25",
        "12-SEP-25",
        "19-SEP-25",
        "26-SEP-25",
        "29-OCT-25",
        "26-NOV-25",
        "29-DEC-25",
        "28-JAN-26",
        "25-FEB-26",
        "27-MAR-26",
        "28-APR-26",
        "27-MAY-26",
        "26-JUN-26"
    ],
    "message": "Found 23 expiry dates for USDINR futures in CDS",
    "status": "success"
}

Error Response

{
    "status": "error",
    "message": "Invalid openalgo apikey"
}

Response Fields

Field	Type	Description
status	string	Response status: "success" or "error"
message	string	Descriptive message about the response
data	array	Array of expiry dates in DD-MMM-YY format, sorted chronologically

Error Codes

HTTP Status	Error Type	Description
200	Success	Request processed successfully
400	Bad Request	Invalid request parameters
403	Forbidden	Invalid API key
500	Server Error	Internal server error

Error Messages

Message	Description
"Invalid openalgo apikey"	The provided API key is invalid
"Symbol parameter is required and cannot be empty"	Symbol field is missing or empty
"Exchange parameter is required and cannot be empty"	Exchange field is missing or empty
"Instrumenttype parameter is required and cannot be empty"	Instrumenttype field is missing or empty
"Instrumenttype must be either 'futures' or 'options'"	Invalid instrumenttype value
"Exchange must be one of: NFO, BFO, MCX, CDS"	Invalid exchange value
"No expiry dates found for [symbol] [instrumenttype] in [exchange]"	No matching expiry dates found

Notes

• Expiry dates are returned in DD-MMM-YY format (e.g., "31-JUL-25")

• Dates are sorted chronologically from earliest to latest

• The API uses exact symbol matching to avoid confusion (e.g., "NIFTY" won't match "BANKNIFTY")

• Different exchanges use different instrument type codes internally but the API accepts standardized "futures" and "options" parameters

• Rate limiting is applied as per your OpenAlgo server configuration

Rate Limits

This API endpoint is subject to rate limiting. The default rate limit is 10 requests per second per API key, but this may vary based on your OpenAlgo server configuration.

Common Use Cases

1. Options Strategy Planning: Get all available expiry dates for options to plan multi-leg strategies

2. Futures Trading: Identify available futures contracts for different expiry months

3. Calendar Spreads: Find suitable expiry dates for calendar spread strategies

Integration Tips

• Cache the expiry dates locally to reduce API calls

• Filter expiry dates based on your trading strategy requirements

• Consider time to expiry when selecting contracts

• Use the chronologically sorted expiry dates for time-based analysis

• Validate the symbol format according to OpenAlgo symbol conventions before making API calls