Venues - Routeur

Routeur covers Kalshi and global Polymarket. Their listings are shaped differently; the API gives both the same form, and keeps the venue’s own identifiers so you can act on them.

	Kalshi	Polymarket
`venue`	`kalshi`	`polymarket`
Market `id`	The market ticker, such as `KXFEDDECISION-26OCT-H0`	The market slug, such as `fed-decision-in-october`
Event `id`	The event ticker	Polymarket’s event id
Outcomes	A Yes and a No on every market	Two outcome tokens per market; the first is treated as Yes
Trade `outcome`	`yes` or `no`	The outcome’s label, with its token
Recorded	Every 15 minutes	Every 30 minutes
Settled history	Kalshi’s own archive back to 2021, with daily candles	Imported history from February 2026, marked `archive`

Prices

Every price is an ask per contract that pays $1, as a decimal string in USD. The implied chance of an outcome is the midpoint of its best Yes ask and one minus its best No ask across venues that list it. When an outcome is listed on both venues, prices carries each venue’s asks and best_venue names the cheaper Yes.

Fees

Leads carry estimated_fee_usd from each venue’s fee schedule, and a lead’s depth is walked with the series’ real fees and minimum sizes. Fees change; treat estimates as estimates.

Contract versions

A market’s terms can change. Each version has a rules_hash, and relations are proven against a specific version; when terms change, the market is re-read and its relations proven again.