Some RICs receive nulls at certain times.

RyoOowada

I am making a streaming request for MarketPrice at RTO using View.

When streaming to some RICs, including ".PSI", the data for each FID is received as "null" around 0:00 (UTC).Can I understand this "null" data to be reset data?

By the way, if I receive data after that, I am able to receive it with data entered for each FID.

Below is an example of received data.

[
{
"ID":69,
"Type":"Refresh",
"Key":{
"Service":"ERT_FD3_LF1",
"Name":".PSI"
},
"State":{
"Stream":"Open",
"Data":"Ok",
"Text":"**All is well"
},
"Qos":{
"Timeliness":"Realtime",
"Rate":"TimeConflated",
"RateInfo":3000
},
"PermData":"AwD9ZzPA",
"SeqNumber":127,
"Solicited":false,
"Fields":{
"TRDPRC_1":null,
"TRDPRC_2":null,
"HST_CLOSE":6190.19,
"PCTCHNG":null
}
}
]

Jirapongse

@RyoOowada

Thank you for reaching out to us.

This could be done by a closing run message. The closing run is a house keeping exercise performed by LSEG that prepares the display template for the next trading session. For example, last trade may be moved to historical close, or bid and ask prices may be cleared.

I checked and found that for .PSI the closing run happens around 21:36:00Z every day.

.PSI,Market Price,2025-08-13T21:36:00.583780617Z,+8,Raw,UPDATE,CLOSING_RUN,,,,6733,,21966,,21

,,,,FID,21,,HST_CLOSE,6325.09,

,,,,FID,79,,HSTCLSDATE,2025-08-13,

,,,,FID,6,,TRDPRC_1,,

,,,,FID,7,,TRDPRC_2,,

,,,,FID,8,,TRDPRC_3,,

,,,,FID,9,,TRDPRC_4,,

The data will be available again around 01:30:00Z.

.PSI,Market Price,2025-08-14T01:30:00.309440838Z,+8,Raw,UPDATE,TRADE,,,,6733,,21998,,12

,,,,FID,6,,TRDPRC_1,6346.17,

,,,,FID,11,,NETCHNG_1,21.08,

,,,,FID,56,,PCTCHNG,0.33,

,,,,FID,77,,NUM_MOVES,1,

,,,,FID,12,,HIGH_1,6346.17,