Series Fee Changes

The common.predictions.kalshi_series_fee_changes table is one row per recorded fee change. Each row is the fee_type and fee_multiplier that took effect at scheduled_ts for a series. The log starts in October 2025. Trades before a series’ first recorded change use the standard Kalshi schedule (quadratic, taker multiplier 1, maker multiplier 0) and are marked is_fee_schedule_inferred on kalshi_trades_enriched. Per-trade fees on Trades Enriched apply Kalshi’s published formula (M_taker × 0.07 × C × P × (1 − P) and M_maker × 0.0175 × C × P × (1 − P)) and round each side up to the next $0.0001.

Table Columns

Unique Key: id

Column Name	Data Type	Description
project	VARCHAR	Project identifier, always ‘kalshi’.
protocol	VARCHAR	Protocol identifier, always ‘kalshi’.
id	VARCHAR	Kalshi fee-change id.
series_ticker	VARCHAR	Series ticker the change applies to.
fee_type	VARCHAR	Fee formula in force after this change.
fee_multiplier	FLOAT	Taker multiplier in force after this change.
scheduled_ts	TIMESTAMP_NTZ(9)	Timestamp when the change takes effect.
ingested_at	TIMESTAMP_NTZ(9)	First-seen ingestion timestamp.
updated_at	TIMESTAMP_NTZ(9)	Last payload update timestamp.
_extra_fields	VARIANT	Remaining fee-change extras.

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Table Columns

​Table Columns

Table Columns