European Central Bank — Open market operations (OMO)

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Open market operations (OMO) — official time series from the European Central Bank Data Portal, published as the OMO dataflow over SDMX 2.1 REST. One endpoint serves XML (SDMX-ML), CSV (?format=csvdata) and JSON (?format=jsondata); extract exactly the series you need with a key path and startPeriod / endPeriod / lastNObservations filters. Browse and chart the same series on the ECB Data Portal.

economyprices

Run verified request Dataflow structure Fetch observations (JSON)Read the docs Open source record

Data schema (30 fields)

Filterable via the API (9)

FREQREF_AREAOMO_TYPEOPERATION_CATOPERATION_SUBCATDATA_TYPETENDER_REFCURRENCYTIME_PERIOD

Click a field to see example values.

Field	Type	Description
FREQFrequency	dimension	2 codes (e.g. Daily - businessweek, Monthly)
REF_AREAReference area	dimension	2 codes (e.g. Euro area (Member States and Institutions of the Euro Area) changing composition, Euro area 20 (fixed composition) as of 1 January 2023)
OMO_TYPEOpen market operations type	dimension	2 codes (e.g. Tender, Purchase)
OPERATION_CATOpen market operations	dimension	7 codes (e.g. Longer-term refinancing operations, Main refinancing operations, Other type of operation)
OPERATION_SUBCATOpen market operations subcategories	dimension	2 codes (e.g. Not applicable, USD 7-days)
DATA_TYPE	dimension	4 codes (e.g. Outstanding, Quarter-end amortisation adjustment and redemptions of coupon STRIPS, Holdings)
TENDER_REFTender ID	dimension	20 codes (e.g. Tender ID 20260028, Tender ID 20260037, Tender ID 20260046)
CURRENCY	dimension	2 codes (e.g. Euro, US dollar)
TIME_PERIODTime period or range	time	Time dimension — filter with startPeriod / endPeriod query params.
OBS_VALUEObservation value	number	The observed numeric value for each cell.
TIME_FORMATTime format code	attribute	—
MATURITY_DATE	attribute	—
ALLOTTED_AMOUNT	attribute	—
SETTLEMENT_DATE	attribute	—
BREAKS	attribute	—
COLLECTIONCollection indicator	attribute	—
COMPILING_ORGCompiling organisation	attribute	—
DISS_ORGData dissemination organisation	attribute	—
AGG_EQUNAggregation equations	attribute	—
COMPILATION	attribute	—
COVERAGE	attribute	—
DECIMALS	attribute	—
SOURCE_AGENCY	attribute	—
TITLE	attribute	—
TITLE_COMPLTitle complement	attribute	—
UNIT	attribute	—
UNIT_MULTUnit multiplier	attribute	—
OBS_STATUSObservation status	attribute	—
OBS_CONFObservation confidentiality	attribute	—
OBS_PRE_BREAKPre-break observation value	attribute	—

Schema captured from sdmx 1 month ago.

Query the data

Pick columns and a sort, then fetch a live preview straight from the source. Choose an API-filterable column (marked ▾) under “Where” to pick from its list of values.

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Sample data (5 records)

Record 1FREQ: B · CURRENCY: EUR

{
  "FREQ": "B",
  "CURRENCY": "EUR",
  "OMO_TYPE": "T",
  "REF_AREA": "U2",
  "DATA_TYPE": "O",
  "OBS_VALUE": 6624,
  "TENDER_REF": "20260028",
  "TIME_PERIOD": "2026-06-30",
  "OPERATION_CAT": "LTRO",
  "OPERATION_SUBCAT": "_Z"
}

Record 2FREQ: B · CURRENCY: EUR

{
  "FREQ": "B",
  "CURRENCY": "EUR",
  "OMO_TYPE": "T",
  "REF_AREA": "U2",
  "DATA_TYPE": "O",
  "OBS_VALUE": 3424,
  "TENDER_REF": "20260037",
  "TIME_PERIOD": "2026-07-23",
  "OPERATION_CAT": "LTRO",
  "OPERATION_SUBCAT": "_Z"
}

Record 3FREQ: B · CURRENCY: EUR

{
  "FREQ": "B",
  "CURRENCY": "EUR",
  "OMO_TYPE": "T",
  "REF_AREA": "U2",
  "DATA_TYPE": "O",
  "OBS_VALUE": 3201,
  "TENDER_REF": "20260046",
  "TIME_PERIOD": "2026-07-23",
  "OPERATION_CAT": "LTRO",
  "OPERATION_SUBCAT": "_Z"
}

Record 4FREQ: B · CURRENCY: EUR

{
  "FREQ": "B",
  "CURRENCY": "EUR",
  "OMO_TYPE": "T",
  "REF_AREA": "U2",
  "DATA_TYPE": "O",
  "OBS_VALUE": 7011,
  "TENDER_REF": "20260057",
  "TIME_PERIOD": "2026-07-23",
  "OPERATION_CAT": "LTRO",
  "OPERATION_SUBCAT": "_Z"
}

Record 5FREQ: B · CURRENCY: EUR

{
  "FREQ": "B",
  "CURRENCY": "EUR",
  "OMO_TYPE": "T",
  "REF_AREA": "U2",
  "DATA_TYPE": "O",
  "OBS_VALUE": 12910,
  "TENDER_REF": "20260050",
  "TIME_PERIOD": "2026-06-16",
  "OPERATION_CAT": "MRO",
  "OPERATION_SUBCAT": "_Z"
}

Live sample captured at profiling time — values may have changed upstream.

Verification Status

Using the API

Query examples

curl -s 'https://data-api.ecb.europa.eu/service/dataflow/ECB' -H 'Accept: application/vnd.sdmx.structure+xml;version=2.1'

All dataflows (datasets) published by this agency, as SDMX-ML.

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Machine-readable & source

JSON

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