This page describes the types of NEX GovPX data available from CME DataMine.

NEX GovPX US Treasury Service offers comprehensive market data coverage across a wide range of US Treasury markets. Historical price discovery is available for both on-the-run and off-the-run issues, including US Treasury Bills, Notes, Bonds, When Issued (WIs), FRNs, TIPS, STRIPS, Basis, Swap boxes and Agencies dating back as far as 2009.

Contents

1 Dates Available
- 1.1 By Dataset
2 Sample Files
3 FAQ

Other Datasets

Resources

Dates Available

GovPX historical data is available starting January 2, 2009 to present*.

*History start dates may vary depending on discontinued or reopened issues.

By Dataset

Dataset	Category	Start Date	End Date

Dataset	Category	Start Date	End Date
GovPX	US Treasury Bills, Notes & Bonds - 1M, 3M, 6M, 1Y, 2Y, 3Y, 5Y, 10Y, 30Y	1/02/2009	Present
GovPX	US TIPS	1/02/2009	Present
GovPX	US STRIPS	1/02/2009	Present
GovPX	US Government Agencies	1/02/2009	Present
GovPX	US Treasury 7 Year Note	2/26/2009	Present
GovPX	US Basis	8/06/2010	Present
GovPX	US Treasury Swap Boxes	08/09/2010	Present
GovPX	US Treasury FRNs	01/24/2014	Present
GovPX	US Treasury Bill- 2M	10/16/2018	Present
GovPX	US Treasury Bill- 4M	10/19/2022	Present

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Sample Files

Dataset	Sample File

Dataset	Sample File
GovPX- US Treasuries	6/6/2019
GovPX- FRNs	6/6/2019
GovPX- Agencies	6/6/2019
GovPX- TIPS	6/6/2019

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FAQ

What format is the file delivered in?

Data is provided in .csv format (comma separated values).

Are files compressed?

Yes, the files are compressed into zip files.

What is the precision level for timestamping for these datasets?

The GovPX dataset has millisecond precision.

What tenors are available for purchase?

The full curve of US Treasury on-the-run, off-the-runs and WIs for Bills, Notes & Bonds are available, as well as TIPS (Treasury Inflation Protected Securities), STRIPS (Separate Trading of Registered Interest and Principle of Securities), Basis, SwapBoxes, FRNs & Agencies.

How many files are available per day?

4 files are available per day. These files are listed below:

NEXGOVPX_UST_YYYYMMDD.csv

NEXGOVPX_FRN_YYYYMMDD.csv

NEXGOVPX_Agencies_YYYYMMDD.csv

NEXGOVPX_TIPS_YYYYMMDD.csv

How far back do you maintain these records?

January 1, 2009 to present. History start dates may differ for newer datasets & individual securities.

Will files be published on holidays?

Files will not be published on US holidays.

How many levels of depth are available?

The historical data consists of indicative Top of Book levels (1 level) – exhibiting Best Bid & Best Ask prices.

Do you have sample files available?

Yes, see Sample Files section above.

Are there any anomalies in the the data?

Yes, at times tenors have been temporarily discontinued and then reintroduced. These periods have been noted below:

Year	Event

Year	Event
2009	February 2009: 7-year note reintroduced. First auction took place February 26, 2009.
2011	March 30, 2011: 30-year data missing 12:30 – 5:55pm NYT.
2012	July 19, 2012: no data available

When are these files delivered?

The files are delivered once per business day; at the close of every business day. This is usually around 6 PM EST.

If I purchase daily updates of these datasets, will I get historical data as well?

No. When an order is placed for daily updates of these datasets, the first file included will be generated for the start date of the subscription. However, files remain accessible for 30 days after purchase, enabling the customer to reference previous day’s data.

How large are these files?

Average daily size of the GovPX file is 5-10 MB (compressed) per day.

What is the file structure for the GovPX dataset?

Please see the below table to find the file structure for this dataset.

US Treasury File

FIELD NAME	CSV COLUMN	EXAMPLE VALUE	SUPPORTED VALUE	DESCRIPTION

FIELD NAME	CSV COLUMN	EXAMPLE VALUE	SUPPORTED VALUE	DESCRIPTION
Timestamp	A	2019-03-20T09:08:32.461-04:00	yyyy-mm-ddThh:mm:ss.sss	Date & Time of update
Producer	B	US_GOVPX	US_GOVPX	GovPX US Treasury Source
Record	C	10_YEAR	1_MONTH, 2_MONTH, 3_MONTH, 4_MONTH, 6_MONTH, 1_YEAR, 2_YEAR, 3_YEAR, 5_YEAR, 7_YEAR, 10_YEAR, 20_YEAR, 30_YEAR, 1_MONTH_WI, 2_MONTH_WI, 3_MONTH_WI, 4_MONTH_WI, 6_MONTH_WI, 1_YEAR_WI, 2_YEAR_WI, 3_YEAR_WI, 5_YEAR_WI, 7_YEAR_WI, 10_YEAR_WI, 20_YEAR_WI, 30_YEAR_WI, 1MO_ROLL, 2MO_ROLL, 3MO_ROLL, 4MO_ROLL, 6MO_ROLL, 12M_ROLL, 2_YR_ROLL, 3_YR_ROLL, 5_YR_ROLL, 7_YR_ROLL, 10_YR_ROLL, 20_YR_ROLL, 30_YR_ROLL. (CUSIPs will be listed as records for most issues).	Instrument Name
Ask	D	100.1641	decimal	Ask Price
AskType	E	17	numeric	Instrument Identifier
AskYield	F	3.03	decimal	Ask Yield in percent
Bid	G	100.1016	decimal	Bid Price
BidType	H	16	numeric
BidYield	I	2.265	decimal	Bid Yield in percent
BidYieldChg	J	9128286B1	int64	Security Identifier
CashAskPrice	K	100.1328	decimal	Cash Ask Price
CashBidPrice	L	-0.03125	decimal	Cash Bid Price
CashMidPrice	M	100.0090779	decimal	Mid Price of Cash Market
Change	N	2.613	decimal	Change
Coupon	O	2.265	decimal	Interest
CUSIP	P	9128286B1	alphanumeric	Security Identifier
Description	Q	1MO_04/30	alphanumeric	Issue Description
DollarFlow	R	-1804	numeric	Trade Size relevant to Trade Price being greater than or equal to the previous trade price. If the current trade price is greater than or equal to the previous trade price the current trade size is added to the Dollar Flow. Otherwise, the current trade size is subtracted from the Dollar Flow.
High	S	0.011	decimal	High price of the day
ICAPVOL	T	24309	int64	Total Market Volume
IndicativeAskPrice	U	100.1640625	decimal	Indicative Ask Price
IndicativeAskYield	V	2.403	decimal	Indicative Ask Yield
IndicativeBidPrice	W	100.1015625	decimal	Indicative Bid Price
IndicativeBidYield	X	2.4	decimal	Indicative Bid Yield
IssueDate	Y	20190215	yyyymmdd	Date of Issuance
Last	Z	99.76563	decimal	Last Trade Price
LastHitorTake	AA	H	H; T	Last Trade Price Hit or Take
LastYield	AB	2.36	decimal	Yield at last trade
Low	AC	99.89063	decimal	Lowest price for the trading day
MaturityDate	AD	20290215	yyyymmdd	Date of Maturity
Mid	AE	100.1328	decimal	Mid Price
MidChg	AF	-0.03125	decimal	Mid Price Change
MidSnapChg	AG	0.8817	decimal	Mid price change on day from previous day
MidYield	AH	2.6095	decimal	Mid Yield in percent
MidYldSnapChg	AI	0.011	decimal	Mid yield change on day from previous day
Open	AJ	100.1563	decimal	First price of the day
SettlementDate	AK	20190320	yyyymmdd	Settlement Date
ShortDescription	AL	10Y	1M, 2M, 3M, 4M, 6M, 1Y, 2Y, 3Y, 5Y, 7Y, 10Y, 20Y, 30Y, 1MW, 2MW, 3MW, 4MW, 6MW, 1YW, 2YW, 3YW, 5YW, 7YW, 10YW, 20YW, 30YW, I (STRIPS Interest), P (STRIPS Princpal); 5t, 10t, 20t, 30t (TIPS).	Short Description Name
TreasuryType	AM	151	150 - off-the-runs notes & bonds; 151- active notes & bonds; 152 - off-the-run bills; 153 - active bills, 154 - WI notes & bonds; 157 - TIPS (Treasury Inflation-Protected Securities).	Type of Treasury
VoiceAskPrice	AN	99.765625	decimal	Ask, when actual markets are available
VoiceAskSize	AO	5	int64	Ask Size, when actual markets are available
VoiceAskYield	AP	2.37	decimal	Ask Yield, when actual markets are available
VoiceBidPrice	AQ	99.76171875	decimal	Bid, when actual markets are available
VoiceBidSize	AR	5	int64	Bid Size, when actual markets are available
VoiceBidYield	AS	2.4	decimal	Bid Yield, when actual markets are available
VoiceTradeSize	AT	5	decimal	Size of voice executed trade
VWAP	AU	99.76171875	decimal	VWAP for day
VWAP10AM-11AM	AV	99.76171875	decimal	VWAP for time period
VWAP11AM-12PM	AW	99.76171875	decimal	VWAP for time period
VWAP12PM-1PM	AX	99.76171875	decimal	VWAP for time period
VWAP1PM-2PM	AY	99.76171875	decimal	VWAP for time period
VWAP2PM-3PM	AZ	99.76171875	decimal	VWAP for time period
VWAP3PM-4PM	BA	99.76171875	decimal	VWAP for time period
VWAP8AM-9AM	BC	99.76171875	decimal	VWAP for time period
VWAP9AM-10AM	BD	99.76171875	decimal	VWAP for time period
VWAY	BE	99.76171875	decimal	VWAY for day
VWAY10AM-11AM	BF	99.76171875	decimal	VWAY for time period
VWAY11AM-12PM	BG	99.76171875	decimal	VWAY for time period
VWAY12PM-1PM	BH	99.76171875	decimal	VWAY for time period
VWAY1PM-2PM	BI	99.76171875	decimal	VWAY for time period
VWAY2PM-3PM	BJ	-99.76171875	decimal	VWAY for time period
VWAY3PM-4PM	BK	99.76171875	decimal	VWAY for time period
VWAY8AM-9AM	BL	99.76171875	decimal	VWAY for time period

TIPS file

FIELD NAME	CSV COLUMN	EXAMPLE VALUE	SUPPORTED VALUE	DESCRIPTION

FIELD NAME	CSV COLUMN	EXAMPLE VALUE	SUPPORTED VALUE	DESCRIPTION
Timestamp	A	2019-03-20T09:08:32.461-04:00	yyyy-mm-ddThh:mm:ss.sss	Date & Time of update
Producer	B	US_GOVPX	US_GOVPX	GovPX US Treasury Source
Record	C	10_YEAR	1_MONTH, 2_MONTH, 3_MONTH, 4_MONTH, 6_MONTH, 1_YEAR, 2_YEAR, 3_YEAR, 5_YEAR, 7_YEAR, 10_YEAR, 20_YEAR, 30_YEAR, 1_MONTH_WI, 2_MONTH_WI, 3_MONTH_WI, 4_MONTH_WI, 6_MONTH_WI, 1_YEAR_WI, 2_YEAR_WI, 3_YEAR_WI, 5_YEAR_WI, 7_YEAR_WI, 10_YEAR_WI, 20_YEAR_WI, 30_YEAR_WI, 1MO_ROLL, 2MO_ROLL, 3MO_ROLL, 4MO_ROLL, 6MO_ROLL, 12M_ROLL, 2_YR_ROLL, 3_YR_ROLL, 5_YR_ROLL, 7_YR_ROLL, 10_YR_ROLL, 20_YR_ROLL, 30_YR_ROLL. (CUSIPs will be listed as records for most issues).	Instrument Name
Ask	D	100.1641	decimal	Ask Price
AskYield

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GovPX Historical Data

Dates Available

By Dataset

Sample Files

FAQ