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Market & Prices

Index classification

Name: Index classification
Creator: TW Market Data
License: https://twmarketdata.com/en/legal/licensing

Index classification — the reference lookup mapping each index code to its family and category (broad-market, sector, thematic).

← Index classification overview

ReferenceSource: TWSE·Plan: free·Cost: 1 credits·GET /v2/datasets/index-classification

Index classification is a Taiwan market dataset sourced from TWSE, served by TW Market Data as GET /v2/datasets/index-classification.

Overview

index-classification is a reference dataset: one record per index describing where it sits in the TWSE index hierarchy. Use it to resolve an index code to its name and category, or to enumerate the indices in a family. It is a lookup snapshot, not a time series of levels.

Field	Type	Description
`index_code`	string	Index code.
`market`	string
`as_of_date`	string
`index_name`	string	Index display name.
`index_type`	string
`sector`	null
`industry`	null
`parent_index_code`	null
`is_sector_index`	boolean
`is_broad_market_index`	boolean
`theme_primary`	null
`theme_secondary`	null

Coverage

Rows	5
Window	2026-05-22 – 2026-05-28
Grade	Reference
Measured	2026-09-01from the dataset registry

Example response

A real response from this endpoint. Rows are returned under "envelope.data", and provenance is carried in the shape shown below — it is not identical across datasets, so read this page's rather than assuming another's.

{
  "api_version": "v2",
  "endpoint": "/v2/datasets/index-classification",
  "request_id": "req_90acb32ace38",
  "plan_id": "enterprise",
  "dataset": "index_classification",
  "query": {
    "index_code": null,
    "market": "TWSE",
    "index_type": null,
    "sector": null,
    "industry": null,
    "limit": 50,
    "offset": 0,
    "sort_by": "as_of_date",
    "sort_order": "desc"
  },
  "meta": {
    "rows_returned": 5,
    "mandatory_contract_fields_present": [
      "api_version",
      "data",
      "data_as_of"
    ],
    "plan": "enterprise",
    "row_limit": 100000,
    "is_limited": false
  },
  "envelope": {
    "api_version": "v2",
    "dataset": "index_classification",
    "dataset_version": "v2.0.0-preview",
    "release_version": "v2.2026-05-28.preview",
    "release_date": "2026-05-28",
    "data_as_of": "2026-05-28",
    "request_context": {
      "ticker": null,
      "as_of_date": "2026-05-28",
      "family": "market_structure_corporate_actions",
      "field_group_type": "derived",
      "dataset_view": "index_classification_v1",
      "supported_sort_by": [
        "as_of_date",
        "index_code"
      ],
      "supported_filter_fields": [
        "index_code",
        "market",
        "index_type"
      ]
    },
    "data": [
      {
        "index_code": "TWSE_TAIEX",
        "market": "TWSE",
        "as_of_date": "2026-05-28",
        "classification_version": "v1",
        "index_name": "TWSE Capitalization Weighted Stock Index",
        "index_type": "broad_market",
        "sector": null,
        "industry": null,
        "parent_index_code": null,
        "is_sector_index": false,
        "is_broad_market_index": true,
        "theme_primary": null,
        "theme_secondary": null,
        "classification_source": "index_code_mapping_v1",
        "provider": "twse_official",
        "source_role": "official_twse_mi_index",
        "lineage": {
          "source_key": {
            "market": "TWSE",
            "as_of_date": "2026-05-28",
            "index_code": "TWSE_TAIEX"
          },
          "mapping_rule": "deterministic index_code mapping v1 only",
          "upstream_lineage": {
            "source": "TWSE_MI_INDEX",
            "source_date": "2026-05-28",
            "source_type": "ALLBUT0999",
            "special_note": null,
            "identity_rule": "exact_index_name_match",
            "source_lineage": {
              "row_number": 1,
              "table_index": 0,
              "table_title": "<Chinese value - see the zh page>"
            },
            "source_table_id": "table_0",
            "turnover_lineage": {
              "stat_item": "<Chinese value - see the zh page>",
              "row_number": 0,
              "table_index": 6,
              "table_title": "<Chinese value - see the zh page>"
            }
          },
          "classification_version": "v1",
          "excluded_fields_reason": "ai/theme confidence/ranking/regime fields excluded by deterministic policy"
        },
        "updated_at": "2026-06-17T05:21:52.769338"
      },
      {
        "index_code": "TWSE_TAIEX",
        "market": "TWSE",
        "as_of_date": "2026-05-27",
        "classification_version": "v1",
        "index_name": "TWSE Capitalization Weighted Stock Index",
        "index_type": "broad_market",
        "sector": null,
        "industry": null,
        "parent_index_code": null,
        "is_sector_index": false,
        "is_broad_market_index": true,
        "theme_primary": null,
        "theme_secondary": null,
        "classification_source": "index_code_mapping_v1",
        "provider": "twse_official",
        "source_role": "official_twse_mi_index",
        "lineage": {
          "source_key": {
            "market": "TWSE",
            "as_of_date": "2026-05-27",
            "index_code": "TWSE_TAIEX"
          },
          "mapping_rule": "deterministic index_code mapping v1 only",
          "upstream_lineage": {
            "source": "TWSE_MI_INDEX",
            "source_date": "2026-05-27",
            "source_type": "ALLBUT0999",
            "special_note": null,
            "identity_rule": "exact_index_name_match",
            "source_lineage": {
              "row_number": 1,
              "table_index": 0,
              "table_title": "<Chinese value - see the zh page>"
            },
            "source_table_id": "table_0",
            "turnover_lineage": {
              "stat_item": "<Chinese value - see the zh page>",
              "row_number": 0,
              "table_index": 6,
              "table_title": "<Chinese value - see the zh page>"
            }
          },
          "classification_version": "v1",
          "excluded_fields_reason": "ai/theme confidence/ranking/regime fields excluded by deterministic policy"
        },
        "updated_at": "2026-06-17T05:21:52.769338"
      }
    ],
    "quality": {
      "freshness_state": "fresh",
      "freshness_as_of": "2026-05-28",
      "completeness_ratio": 1,
      "quality_status": "ready"
    },
    "lineage": {
      "source_role": "canonical",
      "selected_source": "index_classification",
      "fallback_chain": [],
      "policy_notes": [
        "official/public-first canonical",
        "index classification facts mapped deterministically from canonical index/classification sources",
        "ai/rank/regime fields excluded from public contract"
      ]
    },
    "error": {
      "error_code": null,
      "error_message": null,
      "dataset": "index_classification",
      "request_id": "read-api-66158c9b9f87",
      "blocking_gate": null
    }
  }
}

Captured from the live API on 2026-07-20.

Chinese data values are shown as a marker here so this page stays in English; the /zh page shows them verbatim.

Provenance

These columns are returned alongside the data and record where the row came from. They are provenance, not the dataset's subject matter, so they are listed here rather than in the field table.

classification_versionclassification_sourceprovidersource_rolelineageupdated_at

Licence and attribution

Part of the data in this service is obtained from the Government Open Data Platform (data.gov.tw) and used under the Open Government Data License, version 1.0. Providing agencies: Taiwan Stock Exchange, Taipei Exchange, Taiwan Futures Exchange, Taiwan Depository & Clearing Corporation, National Development Council, Central Bank of the Republic of China (Taiwan), Department of Statistics of the Ministry of Economic Affairs, and Customs Administration of the Ministry of Finance. The value-added processing, derived calculations and presentation in this service are the responsibility of TWMD and are not associated with the providing agencies.

Cite this dataset

TW Market Data. (n.d.). Index classification [Data set]. TW Market Data. Retrieved 2026-09-05, from https://twmarketdata.com/en/docs/api/market-prices/index-classification

The version is the dataset's own as_of, not the date this page was built. Where we have no as_of the field is left out rather than filled in. Check a signature

Datasets that join with this one. The key each pair aligns on is shown, so you can plan a multi-table query without guessing.

Market breadth
Joins on as_of_date + market
Market value weight
Joins on as_of_date + market
Technical indicators
Joins on as_of_date + market
Valuation data
Joins on as_of_date + market
GHG Carbon Disclosure (Scope 1/2/3)
Joins on as_of_date + market
Market indices
Same domain: market-prices
Market overview snapshots
Joins on as_of_date

Getting started

Put your key in the X-API-Key header.
Add query parameters (symbol, date range, limit).
Send the request and read the envelope.data array.

curl "https://api.twmarketdata.com/v2/datasets/index-classification?market=TWSE" \
  -H "X-API-Key: sk_live_..."

Filtering

Parameter	Required	Type	Description
`index_code`	No	string	Declared by the endpoint in envelope.request_context.supported_filter_fields.
`market`	No	string	Declared by the endpoint in envelope.request_context.supported_filter_fields.
`index_type`	No	string	Declared by the endpoint in envelope.request_context.supported_filter_fields.

Python

import requests

resp = requests.get(
    "https://api.twmarketdata.com/v2/datasets/index-classification",
    params={"market": "TWSE"},
    headers={"X-API-Key": "sk_live_..."},
)
resp.raise_for_status()
print(resp.json()["envelope"]["data"])

OpenAPI

This endpoint is GET /v2/datasets/index-classification. The full machine-readable schema (parameters, security, response envelope) lives in the OpenAPI spec.

Notes & limitations

Reference lookup snapshot — not a time series; it does not reconstruct how an index was classified at a past date.
Scope: this classification currently covers the broad-market index. The remaining TWSE indices are not classified yet — a query for one returns no rows because it has not been built, not because the endpoint failed.

Request & Response

Request

curl "https://api.twmarketdata.com/v2/datasets/index-classification" \
  -H "X-API-Key: $TWMD_API_KEY"

Response

{
  "api_version": "v2",
  "endpoint": "/v2/datasets/index-classification",
  "request_id": "req_90acb32ace38",
  "plan_id": "enterprise",
  "dataset": "index_classification",
  "query": {
    "index_code": "<null>",
    "market": "<string>",
    "index_type": "<null>",
    "sector": "<null>",
    "industry": "<null>",
    "limit": "<number>",
    "offset": "<number>",
    "sort_by": "<string>",
    "sort_order": "<string>"
  },
  "meta": {
    "rows_returned": "<number>",
    "mandatory_contract_fields_present": "<array>",
    "plan": "<string>",
    "row_limit": "<number>",
    "is_limited": "<boolean>"
  },
  "envelope": {
    "api_version": "<string>",
    "dataset": "<string>",
    "dataset_version": "<string>",
    "release_version": "<string>",
    "release_date": "<string>",
    "data_as_of": "<string>",
    "request_context": {
      "ticker": "<null>",
      "as_of_date": "<string>",
      "family": "<string>",
      "field_group_type": "<string>",
      "dataset_view": "<string>",
      "supported_sort_by": "<array>",
      "supported_filter_fields": "<array>"
    },
    "data": "<array>",
    "quality": {
      "freshness_state": "<string>",
      "freshness_as_of": "<string>",
      "completeness_ratio": "<number>",
      "quality_status": "<string>"
    },
    "lineage": {
      "source_role": "<string>",
      "selected_source": "<string>",
      "fallback_chain": "<array>",
      "policy_notes": "<array>"
    },
    "error": {
      "error_code": "<null>",
      "error_message": "<null>",
      "dataset": "<string>",
      "request_id": "<string>",
      "blocking_gate": "<null>"
    }
  }
}