> ## Documentation Index > Fetch the complete documentation index at: https://docs.deribit.com/llms.txt > Use this file to discover all available pages before exploring further. # Security List(y) The `SecurityList`(`y`) message is used to return a list of securities that matches the criteria specified in a [`Security List Request`(`x`)](/fix-api/production/security-list-request). ### Arguments | Tag | Name | Type | Required | Comments | | -------- | -------------------------- | ------------ | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 320 | `SecurityReqId` | String | Yes | The `SecurityReqId`(`320`) of the request that this is a response for | | 322 | `SecurityResponseID` | String | Yes | Identifier for the Security `List`(`x`) message | | 560 | `SecurityRequestResult` | int | Yes | `0` indicates a successful response. This is the only possible value in the Deribit FIX API | | | Group `SecListGrp` | | | | | 146 | `NoRelatedSym` | NumInGroup | No | Specifies the number of repeating instruments specified | | =>55 | `Symbol` | String | No | Common, "human understood" representation of the security, e.g., BTC-28JUL17, see instrument naming convention below for more details | | =>107 | `SecurityDesc` | String | No | Free form security description: 'future', 'option', 'future\_combo', 'option\_combo' and various indexes | | =>167 | `SecurityType` | String | No | Describes type of security.

Possible values:

| | =>201 | `PutOrCall` | int | No | Indicates whether an Option is for a put or call. Only for Options.

Possible values:

| | =>202 | `StrikePrice` | Price | No | Strike price | | =>947 | `StrikeCurrency` | String | No | Strike currency | | =>15 | `Currency` | String | No | Currency | | =>1524 | `PriceQuoteCurrency` | String | No | Quoting or counter currency | | =>2576 | `InstrumentPricePrecision` | int | No | Number of decimal places for instrument prices (usually 4 for options, 2 for futures) | | =>969 | `MinPriceIncrement` | float | No | Minimum price tick for a given Instrument | | =>311 | `UnderlyingSymbol` | String | No | Underlying symbol for options | | =>225 | `IssueDate` | UTCTimestamp | No | Date instrument was issued | | =>541 | `MaturityDate` | UTCTimestamp | No | Expiration date, `YYYYMMDD` | | =>1079 | `MaturityTime` | UTCTimestamp | No | Time of instruments expiration expressed in local time with offset to UTC specified | | =>562 | `MinTradeVol` | Qty | No | The minimum trading volume for a security | | =>63 | `SettlType` | String | No | Indicates order settlement period. E.g., `M1` – month, `W1` – week, `W2` – 2 weeks etc | | =>120 | `SettlCurrency` | Currency | No | Currency code of settlement denomination | | =>479 | `CommCurrency` | Currency | No | Specifies currency to be used for Commission | | =>231 | `ContractMultiplier` | float | No | Specifies the ratio or multiply factor to convert from contracts to total units | | =>454 | `NoSecurityAltID` | NumInGroup | No | Number of alternate security identifier.

It is present only if [`Security List Request`(`x`)](/fix-api/production/security-list-request) has `DisplayMulticastInstrumentID` = `Y`

| | =>=>455 | `SecurityAltID` | String | No | The security identifier | | =>=>456 | `SecurityAltIDSource` | String | No | Identifies the class or source of the `SecurityAltID`(`455`) value. Required if SecurityAltID is specified.

Possible values:

| | =>1205 | `NoTickRules` | NumInGroup | No | Number of price increment steps.

It is present only if [`Security List Request`(`x`)](/fix-api/production/security-list-request) has `DisplayIncrementSteps` = `Y`

| | =>=>1206 | `StartTickPriceRange` | Price | No | Above this price, the `TickIncrement` applies | | =>=>1208 | `TickIncrement` | Price | No | Valid price increment for prices above the `StartTickPriceRange` | | =>965 | `SecurityStatus` | String | No | (\*) It is present in notifications about new or terminated instruments.

Possible values:

| ### Instrument Naming convention Based on the naming convention, instrument name consist of base currency, quote currency(called together a currency pair), contract expiration date (if the instrument isn't perpetual) and strike price(if the contract is an option). For example: ETH\_USD-14SEP22-2000-P resembles an ETH-USD options contract that expires on 14 september 2022 with PUT strike price at 2000 USD. BTC\_USD trading pair is treated as a default trading pair and doesn't have qoute currency provided in its name. (\*) SecurityStatus is present only in notification messages for subscription by SecurityListRequest with SubscriptionRequestType=1. The notifications for delivered, settlement, inactive, halted, or locked status contain only the status and symbol name.