A recurring family of events. Examples: a weekly inflation reading, a monthly nonfarm payrolls release, a regular sports season. On Kalshi, a Series is identified byDocumentation Index
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series_ticker (e.g. KXPRES). On Polymarket, a Series wraps multiple Events with shared metadata.
Coverage
| Exchange | Sourced | Synthetic | Omitted |
|---|---|---|---|
| kalshi | 9 | 0 | 1 |
| polymarket | 7 | 0 | 3 |
Synthetic — computed by OpenPX, not present upstream.
Omitted — upstream does not expose this concept.
Field crosswalk
| Unified field | Type | kalshi source | polymarket source | Transform | Notes |
|---|---|---|---|---|---|
ticker | string | Series.ticker (string) | Series.ticker (string) | direct | kalshi: Kalshi’s primary series identifier (e.g. KXPRES, KXBTC). polymarket: Polymarket Series exposes both ticker and slug (both nullable). The parser prefers ticker and falls back to slug when ticker is null/empty. Series rows with neither field set are skipped. |
numeric_id | string? | not exposed | Series.id (string) | direct | kalshi: Kalshi has no separate numeric series surface. |
title | string | Series.title (string) | Series.title (string) | direct | |
category | string? | Series.category (string) | category — spec gap | direct | polymarket: Spec gap: the gamma OpenAPI Series schema doesn’t declare a category field, but live /series responses include it for most series. The parser reads it directly. Re-check on each daily upstream refresh — when Polymarket adds it to the spec, promote to a regular ref:. |
frequency | string? | Series.frequency (string) | Series.recurrence (string) | direct | kalshi: Free-form string from Kalshi (e.g. “weekly”, “daily”, “one-off”). polymarket: Polymarket calls the recurrence cadence recurrence rather than frequency. The parser also accepts a top-level frequency field if upstream ever surfaces one, but recurrence is canonical today. |
tags | array | Series.tags (array) | not exposed | passthrough_array | polymarket: Polymarket’s Series schema has no tags field. Tag relationships live on Events and Markets via separate /events/{id}/tags and /markets/{id}/tags endpoints. Left empty on the unified shape. |
settlement_sources | array | Series.settlement_sources (array) | not exposed | passthrough_array | kalshi: Each entry is \{ name, url \} describing an official settlement source — the rulebook authority Kalshi uses to determine market resolution. polymarket: Polymarket resolves via UMA optimistic oracle; structured per-series settlement source feeds are not exposed in the gamma API. Left as an empty array on the unified shape. |
fee_type | string? | Series.fee_type (string) | not exposed | direct | kalshi: Enum: quadratic, quadratic_with_maker_fees, flat. See https://kalshi.com/docs/kalshi-fee-schedule.pdf for the formulas. polymarket: Polymarket fees are configured at the CLOB-exchange level, not per-series. Left None on the unified shape. |
volume | number? (double) | Series.volume_fp (FixedPointCount) | Series.volume (number) | fixed_point_count / direct | kalshi: Populated only when the caller passes include_volume=true to /series/{series_ticker}. Total volume across all events in the series, parsed from Kalshi’s fixed-point string format. polymarket: Polymarket exposes both volume (cumulative) and volume24hr; the unified Series.volume carries the cumulative figure. |
last_updated_ts | string? (date-time) | Series.last_updated_ts (string (date-time)) | Series.updatedAt (string (date-time)) | parse_datetime |
Source specs
- kalshi ·
schema/upstream/kalshi.openapi.yaml - polymarket ·
schema/upstream/polymarket-gamma.openapi.yaml
Tables are auto-generated fromschema/mappings/. CI fails on unresolved $refs and on type mismatches fortransform: direct. Drift in upstream specs surfaces here on the daily refresh PR.