---
title: "Fetch Series"
method: GET
path: "/api/{exchange}/fetchSeries"
---

# Fetch Series

`GET /api/{exchange}/fetchSeries`

Fetch the recurring series (fourth tier above Event -> Market -> Outcome) that this venue exposes. Returns an empty array on venues without a series concept (Limitless, Smarkets, Probable, Metaculus, Baozi, Hyperliquid, SuiBets, Polymarket US). - `params.id` -> a single matching series with its events populated where supported. - no params -> the full list, typically without nested events for payload size.

## Path parameters

- `exchange` 'polymarket' | 'kalshi' | 'kalshi-demo' | 'limitless' | 'probable' | 'baozi' | 'myriad' | 'opinion' | 'metaculus' | 'smarkets' | 'polymarket_us' | 'gemini-titan' | 'hyperliquid' | 'suibets' | 'rain' | 'hunch' | 'router', required

## Response `200`

Fetch Series response

- object
  - `success` boolean
  - `error` ErrorDetail — Structured error envelope returned inside `BaseResponse.error` and `ErrorResponse.error`. Hosted-mode endpoints populate `code`, `retryable`, and optionally `exchange` / `detail`; legacy local-mode endpoints may still return only `message`.
    - `message` string — Human-readable error message.
    - `code` 'HOSTED_TRADING_ERROR' | 'INSUFFICIENT_ESCROW_BALANCE' | 'ORDER_SIZE_TOO_SMALL' | 'INVALID_API_KEY' | 'OUTCOME_NOT_FOUND' | 'CATALOG_UNAVAILABLE' | 'BUILT_ORDER_EXPIRED' | 'INVALID_SIGNATURE' | 'NO_LIQUIDITY' | 'MISSING_WALLET_ADDRESS' | 'BAD_REQUEST' | 'AUTHENTICATION_ERROR' | 'PERMISSION_DENIED' | 'NOT_FOUND' | 'ORDER_NOT_FOUND' | 'MARKET_NOT_FOUND' | 'EVENT_NOT_FOUND' | 'RATE_LIMIT_EXCEEDED' | 'INVALID_ORDER' | 'INSUFFICIENT_FUNDS' | 'VALIDATION_ERROR' | 'NETWORK_ERROR' | 'EXCHANGE_NOT_AVAILABLE' | 'NOT_SUPPORTED' — Stable machine-readable error code. Hosted-mode errors use the `HostedTradingError` family (e.g. `INSUFFICIENT_ESCROW_BALANCE`, `BUILT_ORDER_EXPIRED`); pre-hosted local errors use the legacy family (e.g. `BAD_REQUEST`, `NOT_FOUND`).
    - `retryable` boolean — Hint for clients: when `true`, the same request may succeed on retry (e.g. transient network or rate-limit conditions); when `false`, the caller should not retry without modifying the request.
    - `exchange` string, nullable — Venue the error originated from, when known (e.g. 'polymarket', 'kalshi').
    - `detail` object, nullable — Free-form hosted-mode detail blob. Shape depends on `code` — e.g. for `INSUFFICIENT_ESCROW_BALANCE` it may include `{ requested, available }`; for `ORDER_SIZE_TOO_SMALL` it may include `{ min }`; for `BUILT_ORDER_EXPIRED` it may include `{ expiry }`.
  - `data` UnifiedSeries[]
    - `id` string, required — Stable venue-native series identifier (e.g. "KXATPMATCH" on Kalshi, "atp" on Polymarket Gamma, numeric Gamma id).
    - `ticker` string — Venue-native ticker, when distinct from `id`.
    - `slug` string — Venue-native slug.
    - `title` string, required — Human-readable series title (e.g. "ATP Match Winner", "WTA").
    - `description` string, nullable — Long-form series description.
    - `recurrence` string, nullable — Recurrence cadence the venue reports ('daily', 'weekly', 'annual', ...).
    - `events` UnifiedEvent[] — Child events. Populated when fetched by id; the list form usually omits this to keep payloads small.
      - `id` string, required — The unique identifier for this event.
      - `title` string, required — The event title (e.g., "Who will be Fed Chair?").
      - `description` string, required — Long-form event description.
      - `slug` string, required — URL-friendly slug for the event.
      - `markets` UnifiedMarket[], required — Markets grouped under this event.
        - `marketId` string, required — The unique identifier for this market
        - `eventId` string — Link to parent event
        - `title` string, required — The market title (e.g., "Will BTC close above $100k on Dec 31?").
        - `description` string, required — Long-form market description or resolution criteria.
        - `slug` string — URL-friendly slug for the market.
        - `outcomes` MarketOutcome[], required — The possible outcomes for this market.
          - `outcomeId` string, required — Outcome ID for trading operations (CLOB Token ID for Polymarket, Market Ticker for Kalshi)
          - `marketId` string — The market this outcome belongs to (set automatically when outcomes are built)
          - `label` string, required — Human-readable outcome label (e.g., "Yes", "No", candidate name).
          - `price` number, required — Probability between 0.0 and 1.0.
          - `priceChange24h` number — Change in price over the past 24 hours, as an absolute probability delta.
          - `metadata` object — Exchange-specific metadata (e.g., clobTokenId for Polymarket)
        - `resolutionDate` string, date-time — When the market is scheduled to resolve. Optional because some venues do not publish a cutoff for every market (e.g. Opinion categorical children) — emit `undefined` rather than coercing to epoch.
        - `volume24h` number, required — Trading volume over the past 24 hours (USD).
        - `volume` number — Total / Lifetime volume
        - `liquidity` number, required — Current market liquidity (USD).
        - `openInterest` number — Total value of outstanding contracts (USD).
        - `url` string, required — Canonical URL to view the market on the venue.
        - `image` string — Optional image URL for the market.
        - `category` string — Optional category label. Venue-defined — common values include "Sports", "Politics", "Crypto", "Economics", "Science", "Culture". Polymarket uses finer-grained categories like "Bitcoin", "Soccer", "Economic Policy"; Kalshi uses broader ones like "Sports" or "Mentions".
        - `tags` string[] — Optional list of tags. More granular than category — e.g. ["Crypto", "Crypto Prices", "Bitcoin"] or ["Politics", "Elections", "Trump"]. Tags vary by venue: Polymarket markets carry several, Kalshi typically one.
        - `tickSize` number — Minimum price increment (e.g., 0.01, 0.001)
        - `status` string — Venue-native lifecycle status (e.g. 'active', 'closed', 'archived').
        - `contractAddress` string — On-chain contract / condition identifier where applicable (Polymarket conditionId, etc.).
        - `sourceMetadata` object — Raw venue-specific metadata not captured by first-class fields (e.g. Kalshi series_ticker / series_title from the parent event, Polymarket series). Passed through verbatim so downstream consumers can recover anything the unified shape omits. Each venue populates what it has.
        - `sourceExchange` string — The exchange/venue this market originates from (e.g. 'polymarket', 'kalshi'). Populated by the Router.
        - `yes` MarketOutcome
          - `outcomeId` string, required — Outcome ID for trading operations (CLOB Token ID for Polymarket, Market Ticker for Kalshi)
          - `marketId` string — The market this outcome belongs to (set automatically when outcomes are built)
          - `label` string, required — Human-readable outcome label (e.g., "Yes", "No", candidate name).
          - `price` number, required — Probability between 0.0 and 1.0.
          - `priceChange24h` number — Change in price over the past 24 hours, as an absolute probability delta.
          - `metadata` object — Exchange-specific metadata (e.g., clobTokenId for Polymarket)
        - `no` MarketOutcome
          - `outcomeId` string, required — Outcome ID for trading operations (CLOB Token ID for Polymarket, Market Ticker for Kalshi)
          - `marketId` string — The market this outcome belongs to (set automatically when outcomes are built)
          - `label` string, required — Human-readable outcome label (e.g., "Yes", "No", candidate name).
          - `price` number, required — Probability between 0.0 and 1.0.
          - `priceChange24h` number — Change in price over the past 24 hours, as an absolute probability delta.
          - `metadata` object — Exchange-specific metadata (e.g., clobTokenId for Polymarket)
        - `up` MarketOutcome
          - `outcomeId` string, required — Outcome ID for trading operations (CLOB Token ID for Polymarket, Market Ticker for Kalshi)
          - `marketId` string — The market this outcome belongs to (set automatically when outcomes are built)
          - `label` string, required — Human-readable outcome label (e.g., "Yes", "No", candidate name).
          - `price` number, required — Probability between 0.0 and 1.0.
          - `priceChange24h` number — Change in price over the past 24 hours, as an absolute probability delta.
          - `metadata` object — Exchange-specific metadata (e.g., clobTokenId for Polymarket)
        - `down` MarketOutcome
          - `outcomeId` string, required — Outcome ID for trading operations (CLOB Token ID for Polymarket, Market Ticker for Kalshi)
          - `marketId` string — The market this outcome belongs to (set automatically when outcomes are built)
          - `label` string, required — Human-readable outcome label (e.g., "Yes", "No", candidate name).
          - `price` number, required — Probability between 0.0 and 1.0.
          - `priceChange24h` number — Change in price over the past 24 hours, as an absolute probability delta.
          - `metadata` object — Exchange-specific metadata (e.g., clobTokenId for Polymarket)
      - `volume24h` number, required — Trading volume over the past 24 hours (USD).
      - `volume` number — Total / Lifetime volume (sum across markets; undefined if no market provides it)
      - `url` string, required — Canonical URL to view the event on the venue.
      - `image` string — Optional image URL for the event.
      - `category` string — Optional category label. Venue-defined — common values include "Sports", "Politics", "Crypto", "Economics", "Science", "Culture". Polymarket uses finer-grained categories like "Bitcoin", "Soccer", "Economic Policy"; Kalshi uses broader ones like "Sports" or "Mentions".
      - `tags` string[] — Optional list of tags. More granular than category — e.g. ["Sports", "FIFA World Cup", "2026 FIFA World Cup"] or ["Politics", "Geopolitics", "Middle East"]. Tags vary by venue: Polymarket markets carry several, Kalshi typically one.
      - `sourceMetadata` object — Raw venue-specific metadata not captured by first-class fields (e.g. Kalshi series_ticker / series_title, Polymarket series). Passed through verbatim so downstream consumers can recover anything the unified shape omits. Each venue populates what it has.
      - `sourceExchange` string — The exchange/venue this event originates from (e.g. 'polymarket', 'kalshi'). Populated by the Router.
    - `url` string, nullable — Canonical venue URL for the series.
    - `image` string, nullable — Venue-hosted image.
    - `sourceExchange` string — The exchange this series originates from. Populated by the Router.
    - `sourceMetadata` object — Raw venue-specific fields not promoted to first-class columns.

---

[API](https://skmtc.net/pmxt-dev/apis/pmxt-hosted-api.md) · [All operations](https://skmtc.net/pmxt-dev/apis/pmxt-hosted-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/pmxt-dev/pmxt-hosted-api/versions/da5293255d19/schema)