> ## Documentation Index
> Fetch the complete documentation index at: https://docs.allium.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Series

> Kalshi series metadata including fee type, fee multiplier, title, category, and tags.

The `common.predictions.kalshi_series` table is one row per Kalshi series ticker. It carries the current fee schedule parameters from the series API plus title, category, and tags.

Use this table to filter markets and trades by series tags, or to look up the current taker fee multiplier for a series. Historical fee rates in force on a given trade date live on `kalshi_trades_enriched` and `kalshi_series_fee_changes`, not here.

<Note>
  Kalshi's published trade-fee schedule is taker `M_taker × 0.07 × C × P × (1 − P)` and maker `M_maker × 0.0175 × C × P × (1 − P)`, with each side rounded up to the next `$0.0001`. `fee_multiplier` here is the current `M_taker`. Per-trade fees using the schedule in force on `trade_date` are on [Trades Enriched](/historical-data/predictions/kalshi/trades-enriched).
</Note>

### Table Columns

Unique Key: `ticker`

| Column Name       | Data Type         | Description                                                                                                                         |
| ----------------- | ----------------- | ----------------------------------------------------------------------------------------------------------------------------------- |
| project           | VARCHAR           | Project identifier, always 'kalshi'.                                                                                                |
| protocol          | VARCHAR           | Protocol identifier, always 'kalshi'.                                                                                               |
| ticker            | VARCHAR           | Kalshi series ticker.                                                                                                               |
| fee\_type         | VARCHAR           | Fee formula: quadratic, quadratic\_with\_maker\_fees, quadratic\_with\_combo\_maker\_fees, or margin\_market\_maker\_program\_fees. |
| fee\_multiplier   | FLOAT             | Taker multiplier from the series API. Default 1.                                                                                    |
| last\_updated\_ts | TIMESTAMP\_NTZ(9) | Series last\_updated\_ts from the API.                                                                                              |
| title             | VARCHAR           | Series title.                                                                                                                       |
| category          | VARCHAR           | Series category.                                                                                                                    |
| tags              | VARIANT           | Series topic tags from the API.                                                                                                     |
| product\_metadata | VARIANT           | Optional product\_metadata object from the series API. Sparse.                                                                      |
| ingested\_at      | TIMESTAMP\_NTZ(9) | First-seen ingestion timestamp.                                                                                                     |
| updated\_at       | TIMESTAMP\_NTZ(9) | Last payload update timestamp.                                                                                                      |
| \_extra\_fields   | VARIANT           | Remaining series API extras.                                                                                                        |