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Data · Every venue · One key

The prediction market data API for builders who ship.

The prediction market data API for builders who ship.

The prediction market data API for builders who ship.

Real-time prices, orderbooks, trades, and resolutions across every major prediction market. Polymarket, Kalshi, Limitless — and soon HIP-4 and Predict.fun. One authentication, one schema, one bill.

Real-time prices, orderbooks, trades, and resolutions across every major prediction market. Polymarket, Kalshi, Limitless — and soon HIP-4 and Predict.fun. One authentication, one schema, one bill.

Get free API Key

Get free API Key

Read the docs

Read the docs

<1s

<1s

Real-time latency

<1s

<1s

Real-time latency

1B+

1B+

Events indexed

1B+

1B+

Events indexed

98.0%

98.0%

Uptime SLA

98.0%

98.0%

Uptime SLA

900

900

Free requests / day

900

900

Free requests / day

Everything you need, one endpoint away.

Everything you need, one endpoint away.

Everything you need, one endpoint away.

Stop maintaining five separate integrations, five auth flows, and five inconsistent schemas. Assymetrix normalizes every venue into a single API surface.

Stop maintaining five separate integrations, five auth flows, and five inconsistent schemas. Assymetrix normalizes every venue into a single API surface.

A dark-mode user interface card highlighting real-real time streaming data features, sub-second latency, WebSocket integration, smart filtering, and a unified schema.

Sub-second market data

Live prices, orderbooks, and trades pushed via WebSocket. Filter by venue, category, or specific markets. One connection, one message schema across every exchange.

A dark-mode user interface card highlighting real-real time streaming data features, sub-second latency, WebSocket integration, smart filtering, and a unified schema.

Sub-second market data

Live prices, orderbooks, and trades pushed via WebSocket. Filter by venue, category, or specific markets. One connection, one message schema across every exchange.

A dark-mode user interface card showcasing historical data and tick-level market history since 2020 for backtesting and research.

Tick-level history since 2020

Every trade, every orderbook change, every resolution — going back to each venue's launch. Bulk export as Parquet or query on demand. Purpose-built for backtesting and research.

A dark-mode user interface card highlighting full market audit trails, event provenance, resolution datasets, and oracle feed mechanics for prediction markets.

Full audit trail per market

Not just the final outcome — the timing, the source, the disputes, the oracle mechanics. The only prediction market API that treats resolution as a first-class dataset.

A dark-mode user interface card highlighting full market audit trails, event provenance, resolution datasets, and oracle feed mechanics for prediction markets.

Full audit trail per market

Not just the final outcome — the timing, the source, the disputes, the oracle mechanics. The only prediction market API that treats resolution as a first-class dataset.

Query any venue with the same syntax.

Query any venue with the same syntax.

One schema. Five venues today. More every quarter.

One schema. Five venues today. More every quarter.

import assymetrix
 
client = assymetrix.Client(api_key="YOUR_KEY")
 
# Every venue quoting the same market
markets = client.markets.search(
    query="Fed cut September",
    venues=["polymarket", "kalshi", "limitless"],
    status="open",
)
 
for m in markets:
    print(f"{m.venue}: {m.yes_price:.2f} · vol {m.volume_24h:,.0f}")

Coverage across the ecosystem.

Coverage across the ecosystem.

Every major venue, live and historical.

Every major venue, live and historical.

Venue

Real-time

Historical

Orderbook

Resolutions

Polymarket

Live

Since 2020

L2 depth

Full audit trail

Kalshi

Live

Since 2020

L2 depth

CFTC Resolutions

Limitless

Live

Since 2020

L2 depth

Full Audit Trail

HIP-4 (Hyperliquid)

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Predict.Fun

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Venue

Real-time

Historical

Orderbook

Resolutions

Polymarket

Live

Since 2020

L2 depth

Full audit trail

Kalshi

Live

Since 2020

L2 depth

CFTC Resolutions

Limitless

Live

Since 2020

L2 depth

Full Audit Trail

HIP-4 (Hyperliquid)

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Predict.Fun

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Venue

Real-time

Historical

Orderbook

Resolutions

Polymarket

Live

Since 2020

L2 depth

Full audit trail

Kalshi

Live

Since 2020

L2 depth

CFTC Resolutions

Limitless

Live

Since 2020

L2 depth

Full Audit Trail

HIP-4 (Hyperliquid)

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Predict.Fun

Q4 2026

Q4 2026

Q4 2026

Q4 2026

Need a venue not listed?

Tell us. Enterprise customers can request coverage additions with SLA-backed delivery timelines.

Need a venue not listed? Tell us. Enterprise customers can request coverage additions with SLA-backed delivery timelines.

Need a venue not listed? Tell us. Enterprise customers can request coverage additions with SLA-backed delivery timelines.

PRICING

Pricing that scales with you.

Pricing that scales with you.

Start free. Grow with usage-based tiers. Enterprise gets custom SLAs, dedicated support, and volume commitments.

Start free. Grow with usage-based tiers. Enterprise gets custom SLAs, dedicated support, and volume commitments.

Free

$0

$0

/ month

1,000 requests per day. Live prices across all venues. Real-time WebSocket (limited channels). No credit card required.

Get started

Get started

Pro

$299

$299

/ month

100k requests per day. Full orderbook depth. All WebSocket channels. Historical data access. Email support.

Get started

Get started

Enterprise

Custom

Unlimited requests. Full historical bulk export. Dedicated support. 99.9% SLA. Custom venue coverage. Intelligence layer included.

Get started

Get started

FAQ

Frequently

Frequently

Asked Questions

Asked Questions

Have questions? Our FAQ section has you covered with
quick answers to the most common inquiries.

Have questions? Our FAQ section has you covered with
quick answers to the most common inquiries.

How is Assymetrix different from Polymarket's or Kalshi's own APIs?

How is Assymetrix different from other aggregators like Dome or FinFeedAPI?

Can I test before paying?

What SDKs do you support?

What's the historical data format?

Is there rate limiting?

Ship your first request in under a minute.

Ship your first request in under a minute.

Ship your first request in under a minute.

Free tier, real venues, no credit card. See the API that already powers institutional-grade prediction market work.

Free tier, real venues, no credit card. See the API that already powers institutional-grade prediction market work.

Get free API Key

Get free API Key

Get free API Key

Get free API Key

Read the docs

Read the docs