Changelog

v1.0.1 — 22 October 2026

• /events/{slug}/history now returns history for every outcome. Where TPM doesn't stream a market, points come from the venue's own price history (source: "venue_history", or "mixed" when streamed candles start partway through). Outcomes from comparable events shown on the event page work too.
• /matches also returns markets the event page shows as comparable, with match_state: "COMPARABLE". Only the titles match, so check the settlement rules.
• History timestamps end in Z, like every other time in the API.

v1.0.0 — 21 October 2026

Initial release of the stable public API at /api/public/v1.

• /events and /events/{slug}: events grouped across Kalshi and Polymarket, with every outcome's quote and freshness, cross-venue matches and gross gaps.
• /events/{slug}/history: OHLC candles or snapshots, up to 180 days.
• /markets, /matches and /prices: venue listings, venue-to-venue mapping and bulk quotes.
• /spreads, /categories, /status and /rate-limit.
• Live quotes WebSocket (tpm.quotes.v1) using the stream ids on every outcome.
• One error shape with dotted codes, X-Request-ID on every response, and rate-limit and quota headers.

Coming from the old /api/v2 docs

Earlier versions of these docs described /api/v2 routes. Those are the website's own internal API: they can change without notice and are no longer documented. Move to v1:

Versioning policy

• v1 only grows. We may add endpoints, optional parameters, response fields and error codes. Write clients that ignore unknown fields.
• We never rename or remove a v1 field or endpoint, or change its type or meaning.
• A breaking change would ship as /api/public/v2, announced here in advance, with v1 kept running during the move.