Offer

[Source]

The Offer ledger entry describes an Offer to exchange currencies in the XRP Ledger's decentralized exchange. (In finance, this is more traditionally known as an order.) An OfferCreate transaction only creates an Offer entry in the ledger when the Offer cannot be fully executed immediately by consuming other Offers already in the ledger.

An Offer can become unfunded through other activities in the network, while remaining in the ledger. When processing transactions, the network automatically prunes any unfunded Offers that those transactions come across. (Otherwise, unfunded Offers remain, because only transactions can change the ledger state.)

Example Offer JSON

{
    "Account": "rBqb89MRQJnMPq8wTwEbtz4kvxrEDfcYvt",
    "BookDirectory": "ACC27DE91DBA86FC509069EAF4BC511D73128B780F2E54BF5E07A369E2446000",
    "BookNode": "0000000000000000",
    "Flags": 131072,
    "LedgerEntryType": "Offer",
    "OwnerNode": "0000000000000000",
    "PreviousTxnID": "F0AB71E777B2DA54B86231E19B82554EF1F8211F92ECA473121C655BFC5329BF",
    "PreviousTxnLgrSeq": 14524914,
    "Sequence": 866,
    "TakerGets": {
        "currency": "XAG",
        "issuer": "r9Dr5xwkeLegBeXq6ujinjSBLQzQ1zQGjH",
        "value": "37"
    },
    "TakerPays": "79550000000",
    "index": "96F76F27D8A327FC48753167EC04A46AA0E382E6F57F32FD12274144D00F1797"
}

Offer Fields

An Offer object has the following fields:

Name JSON Type Internal Type Required? Description
Account String AccountID Yes The address of the account that owns this Offer.
BookDirectory String Hash256 Yes The ID of the Offer Directory that links to this Offer.
BookNode String UInt64 Yes A hint indicating which page of the offer directory links to this object, in case the directory consists of multiple pages.
Expiration Number UInt32 No Indicates the time after which this Offer is considered unfunded. See Specifying Time for details.
Flags Number UInt32 Yes A bit-map of boolean flags enabled for this offer.
LedgerEntryType String UInt16 Yes The value 0x006F, mapped to the string Offer, indicates that this object describes an Offer.
OwnerNode String UInt64 Yes A hint indicating which page of the owner directory links to this object, in case the directory consists of multiple pages. Note: The offer does not contain a direct link to the owner directory containing it, since that value can be derived from the Account.
PreviousTxnID String Hash256 Yes The identifying hash of the transaction that most recently modified this object.
PreviousTxnLgrSeq Number UInt32 Yes The index of the ledger that contains the transaction that most recently modified this object.
Sequence Number UInt32 Yes The Sequence value of the OfferCreate transaction that created this Offer object. Used in combination with the Account to identify this Offer.
TakerPays String or Object Amount Yes The remaining amount and type of currency requested by the Offer creator.
TakerGets String or Object Amount Yes The remaining amount and type of currency being provided by the Offer creator.

Offer Flags

There are several options which can be either enabled or disabled when an OfferCreate transaction creates an offer object. In the ledger, flags are represented as binary values that can be combined with bitwise-or operations. The bit values for the flags in the ledger are different than the values used to enable or disable those flags in a transaction. Ledger flags have names that begin with lsf.

Offer objects can have the following flag values:

Flag Name Hex Value Decimal Value Corresponding OfferCreate Flag Description
lsfPassive 0x00010000 65536 tfPassive The object was placed as a passive Offer. This has no effect on the object in the ledger.
lsfSell 0x00020000 131072 tfSell The object was placed as a sell Offer. This has no effect on the object in the ledger (because tfSell only matters if you get a better rate than you asked for, which cannot happen after the object enters the ledger).

Offer ID Format

The ID of an Offer object is the SHA-512Half of the following values, concatenated in order:

  • The Offer space key (0x006F)
  • The AccountID of the account placing the Offer

  • The Sequence number of the OfferCreate transaction that created the Offer.

    If the OfferCreate transaction used a Ticket, use the TicketSequence value instead.