Errata

This is a public log of corrections we have made to the data catalog — grades that overclaimed, datasets that were sold with no live data, fields that did not match the real response. A data API that hides its mistakes is the one you should not trust, so we publish ours. Newest first.

2026-07-23price-enhanced

price-enhanced was described as OHLCV / enhanced price fields — it is actually ex-rights/dividend adjustment factors

Before: The page listed derived OHLCV-style fields (change, amplitude, VWAP) as if that were the service.
Now: The live service returns ex-rights/dividend price-adjustment factors from the official TWSE TWT49U report — event_type / factor / pre_event_close / reference_price. The name, description and field list were corrected to match the real response; the slug is unchanged.

2026-07-23chip-flows · events

chip-flows and events were graded as if serving — both return zero rows, now marked Building

Before: chip-flows carried a Derived grade and events a Verified grade, implying queryable data.
Now: Both endpoints return 0 rows in practice (the aggregation is not wired through yet). They are now graded Building. events has ~1,709 rows in its table but the endpoint serves none, so the row count was removed rather than shown as if queryable.

2026-07-22institutional-ownership

institutional-ownership was graded Verified with foreign-holding fields it never served — delisted

Before: It was listed as a sellable Verified dataset with foreign_shares_held / foreign_holding_ratio fields.
Now: The endpoint returns 0 rows and has no live backing table, so the Verified grade and those fields were unbacked. It was removed from the sellable catalog; its old docs URL now shows an honest retired note pointing to ownership-distribution (available) and foreign-holding (roadmap).

2026-07-22corporate-actions

corporate-actions was graded Verified before its serving met the bar — downgraded to Reference

Before: Graded Verified.
Now: Serving did not meet the verified standard yet, so it was downgraded to Reference until the repoint lands. It will be raised again once it serves cleanly.

2026-07-22market-snapshot · etf-flow

market-snapshot and etf-flow were sellable with no live backing data — delisted

Before: Both were listed in the sellable catalog; etf-flow had even been graded as if verified.
Now: market-snapshot has no live backing table and etf-flow has no official source and returns 0 rows, so both were fully removed rather than sold as empty inventory.

2026-07-22docs · request examples

Dataset request examples used a date parameter the backend ignores — corrected to start_date/end_date

Before: Examples used date_from / date_to, which the backend silently ignores (a request came back unfiltered, at the row limit).
Now: The examples and parameter tables now use start_date / end_date — the names the OpenAPI documents and the only ones that actually filter — driven from a single source so the table and the example can never disagree.

price-enhanced was described as OHLCV / enhanced price fields — it is actually ex-rights/dividend adjustment factors

Before

The page listed derived OHLCV-style fields (change, amplitude, VWAP) as if that were the service.

Now

The live service returns ex-rights/dividend price-adjustment factors from the official TWSE TWT49U report — event_type / factor / pre_event_close / reference_price. The name, description and field list were corrected to match the real response; the slug is unchanged.

chip-flows and events were graded as if serving — both return zero rows, now marked Building

Before

chip-flows carried a Derived grade and events a Verified grade, implying queryable data.

Now

Both endpoints return 0 rows in practice (the aggregation is not wired through yet). They are now graded Building. events has ~1,709 rows in its table but the endpoint serves none, so the row count was removed rather than shown as if queryable.

institutional-ownership was graded Verified with foreign-holding fields it never served — delisted

Before

It was listed as a sellable Verified dataset with foreign_shares_held / foreign_holding_ratio fields.

Now

The endpoint returns 0 rows and has no live backing table, so the Verified grade and those fields were unbacked. It was removed from the sellable catalog; its old docs URL now shows an honest retired note pointing to ownership-distribution (available) and foreign-holding (roadmap).

Dataset request examples used a date parameter the backend ignores — corrected to start_date/end_date

Before

Examples used date_from / date_to, which the backend silently ignores (a request came back unfiltered, at the row limit).

Now

The examples and parameter tables now use start_date / end_date — the names the OpenAPI documents and the only ones that actually filter — driven from a single source so the table and the example can never disagree.