Prediction Markets API

Everything you needfor prediction market data

One API for events, markets, traders, holdings, and order books across every venue. No stitching, no reconciliation, no per-venue auth.

Trending events

Find the events moving right now with sub-day
trending scores the venues cannot give you.

Will Bitcoin close above $150,000 by year-end?$42.8M volume

+4.1¢

NBA Finals winner$28.4M volume

+1.8¢

Will the Fed cut rates at the next meeting?$14.9M volume

+1.8¢

Super Bowl winner$6.7M volume

-0.6¢

KWill the Fed hold rates steady?$14.9M volume

-0.6¢

Market discovery

Odds, volume, traders, and event history
across Polymarket, Kalshi, and more.

Bitcoin

OpenCryptoPolymarket> $1M vol

BTC above $150k by EOYPolymarket↑ YES@92¢

BTC above $150k by EOYKalshi↑ YES@92¢

BTC above $150k by EOYPolymarket↑ YES@92¢

BTC above $150k by EOYKalshi↑ YES@92¢

BTC above $150k by EOYPolymarket↑ YES@92¢

Event-level rollups

Each event response rolls up volume, liquidity,
open interest, trade count, and unique traders.

NBA Final winners

VOLUME+12.4%$48.2M

TRADES+8.1%214,892

BUYS+15.3%31,204

SELLS+0.9%28,117

Charts & OHLC bars

Historical and live OHLC bars for every market
and every outcome in an event, plotted as
probability over time.

1h6h1d1wAll

France38.9%England21.6%Spain20.8%Argentina17.4%

Trader leaderboards

Rank traders by profit, ROI, win rate, or
volume across every time window.

01Theo40x4f2a...91c3

+$184k+312%

020xShroud0x9b1e...4af7

+$121k+247%

03kalshi-kat0x77d0...2c58

+$96k+188%

04meanrev0x31c8...e90b

+$71k+140%

See prediction datain action

Click around and see the queries powering production prediction apps.

Trending events

Live

QueryGraphQL

query TrendingPredictionEvents {
  filterPredictionEvents(
    filters: { status: [OPEN] }
    rankings: [{ attribute: volumeUsd24h, direction: DESC }]
    limit: 25
  ) {
    results {
      id marketCount
      event { question protocol imageThumbUrl }
      volumeUsd24h trades24h uniqueTraders24h
    }
  }
}

Responsefetching…

{
  …
}

Codex vs the venue APIsin numbers

Latency, throughput, depth, and breadth. Where Codex pulls ahead on every dimension that matters.

Page load

300ms

300 ms

2-5 s

1.5-3 s

Rate limit

1,000+ req / s

1,000+

30 r/s

20 r/s

Time windows

6windows

5m1h4h12h24h1w

Stat-based filters

30+

8

5

Coverage

Every venue, one schema

Polymarket & Kalshi + Rest as launched

APIPolymarket only

APIKalshi only

Real-time

Websockets + webhooks

Real time

Partial WS | REST polling

REST polling

Every venuein one schema

Polymarket and Kalshi today, the rest as they come online. Same query, same fields, same ranking.

Built to pluginto anything

Query events and odds on demand, stream every fill live, or get pushed the moment a market moves.

query filterPredictionEvents200 · 58 ms

filterPredictionEvents(
  rankings: [{ attribute: openInterestUsd }]
  limit: 4
) { results { event { question protocol } openInterestUsd } }

Response

{ "question": "LeBron James's next team?",
  "protocol": "KALSHI", "openInterestUsd": 143571272 }

query filterPredictionEvents200 · 58 ms

filterPredictionEvents(
  rankings: [{ attribute: openInterestUsd }]
  limit: 4
) { results { event { question protocol } openInterestUsd } }

Response

{ "question": "LeBron James's next team?",
  "protocol": "KALSHI", "openInterestUsd": 143571272 }

Codex powersindustry leaders

Learn how Codex saves the world’s
leading apps time, money, and a whole lot
of on-call shifts.

TradingView, and their 50 million users, rely on Codex as the sole source of truth for all on-chain data. We were using 3 to 4 data providers previously, including The Graph, and have now consolidated everything on Codex.

Alex T.

Head of Product, Crypto

Codex has always been very supportive and quick with any changes or features requested. But by far the most solid difference for me is the support of the many available launchpads these days and their extensive token filter endpoints.

RickBot Developer

RickBot

I can spin up a UI. I cannot spin up Codex. Don't try to price all the assets on every chain ever. Just don't. I'll see you in three years, gray and impoverished.

JJ

Co-founder, Glider

On the amount of data, nothing is comparable. We had CoinGecko for candles, Birdeye for something else, CoinMarketCap for this and that. With Codex, it's the whole package, and the speed is incredible. That's why we stuck with it.

Jo

Co-founder & CTO, gg.xyz

Working with the Codex team has been a game-changer. Codex seamlessly provides all the data we need, when we need it. If the data we want isn't currently available, the development team makes it available for us. I wish all of our integrations went this smoothly.

Owen

Co-Founder of Sudorandom Labs

TradingView, and their 50 million users, rely on Codex as the sole source of truth for all on-chain data. We were using 3 to 4 data providers previously, including The Graph, and have now consolidated everything on Codex.

Alex T.

Head of Product, Crypto