Indexes

Message Layouts
PreTrade

Message

TopOfBook (i)

ID9938
Used to update the level 1 service following any change to the consolidated Best Bid and Offer.
83
Y
Length of message including this field.
90
Y
0x69=TOB
185
Y
Time the message was generated.
70
Y
GTP Instrument identifier.
171
Y
Venue from which market data is received for the instrument.

Please refer to the Additional Field Values section for valid values.
22
Y
Aggregated size of all bid market orders. Value will be 0 if there are no market orders.
20
Y
Price of the best buy limit order. The Implied Bid Price for an instrument only traded on yield.
23
Y
Yield of the best buy Limit order.
21
Y
Aggregated size of all orders at the best buy limit price.
115
Y
Aggregated size of all offer market orders. Value will be 0 if there are no market orders.
113
Y
Price of the best sell limit order. Implied Offer Price for an instrument only traded on yield.
116
Y
Yield of the best offer Limit order.
114
Y
Aggregated size of all orders at the best sell limit price.
123
Y
Please refer to the Additional Field Values section for valid values.
Y

Orchimate Copyright 2026 Atomic Wire Technology Limited
Orchestra Copyright 2026 FIX Protocol Ltd
Terms of Service|Privacy Policy