One clean API for prediction-market data.

Historical, live, and canonical cross-venue inventory, normalized across venues. One schema, one key. No per-venue glue, no reverse-engineering websockets. Simpler than the incumbents by design.

Read the docs

Request

curl https://api.lateas-data.com/v1/inventory \
  -H "Authorization: Bearer $LATEAS_KEY" \
  -d category=Crypto

200 OK

{
  "canonical_event_id": "evt_btc_100k_aug31",
  "title": "Bitcoin above $100,000 on Aug 31?",
  "category": "Crypto",
  "end_date": "2026-08-31T00:00:00Z",
  "cross_venue_spread": 0.031,
  "legs": [
    { "venue": "polymarket", "market_id": "0xab…", "last": 0.62 },
    { "venue": "kalshi",     "market_id": "BTC-31AUG", "last": 0.59 },
    { "venue": "limitless",  "market_id": "btc-…", "last": 0.63 }
  ]
}

Inventory

GET /v1/inventory

Canonical cross-venue events. One real-world question, linked across every venue that lists it. The Bloomberg-style catalog.

Field	Type	Description
canonical_event_id	string	Stable cross-venue event id
title	string	Canonical event title
category	enum	Crypto · Financials · Sports · Politics
end_date	timestamp	Resolution / settlement time (UTC)
legs	VenueLeg[]	Per-venue listings linked to this event
cross_venue_spread	float	Max−min price across venues (0..1)

Historical

GET /v1/historical

Books, trades, BBOs and volumes captured tick-by-tick. Query by venue, market and time range; stream or bulk-download.

Field	Type	Description
ts_recv	int64 (ns)	Collector receive time, UTC nanoseconds
venue	enum	polymarket · kalshi · limitless
market_id	string	Venue-native market id
type	enum	book · trade · bbo
price	int64 ×1e8	Fixed-point probability (scaled)
size	int64	Contracts

Live

GET /v1/live (SSE)

Real-time books, trades and BBOs over a single streaming connection. Subscribe by venue or market.

Field	Type	Description
event	enum	book · trade · bbo · heartbeat
venue	enum	polymarket · kalshi · limitless
market_id	string	Venue-native market id
bid / ask	float	Best bid / ask (0..1)
ts	int64 (ms)	Server timestamp

Illustrative mockup. Endpoints, schemas and payloads shown here aren't live yet. Keys, usage-based billing and rate limits ship with the API.