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Codex Prediction Markets API: query events, markets and traders together

Codex Prediction Markets API, published at codex.io, supplies Polymarket and Kalshi data for applications. It connects event groups, individual markets, outcome prices and trader metrics through protocol-specific filters and identities.

3.5/ 5Editorial ratingEditorial assessment
Read the prediction-market API guidedocs.codex.io
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Screenshots and interface

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Documented API fields and identity concepts.

What is Codex Prediction Markets API?

A screener can filter category, status, volume or liquidity, then rank on a selected activity window. Short and long windows cover trade counts, unique traders and changes in liquidity or open interest. Query only the fields and date ranges required, preserving venue-prefixed IDs rather than replacing them with titles.

Chart and trader-page recipes combine OHLC/volume bars with trader statistics, market-level activity and holder data. Events remain groups of markets, not interchangeable outcome records. The service provides analytics; order execution needs another integration.

Who it is for

  • Market-discovery and event-page developers.
  • Teams ranking recent market activity.
  • Researchers joining wallet and market performance.

Data and API methods

  • Event and market filters

    Select category, status, volume, liquidity and ranking metrics.

  • Windowed activity

    Compare trade counts, unique traders, liquidity and open-interest changes.

  • Outcome bars

    Fetch OHLC and volume with explicit IDs and ranges.

  • Trader discovery

    Filter volume, PnL and supported metrics and inspect market-level activity.

  • Trades and holders

    Query trade history, outcome-token holders and market positions.

  • GraphQL recipes

    Use Explorer examples for discovery, profiles, charts and event pages.

Integration tasks

Build a screener

Filter open events, sort by the intended window and fetch component markets, retaining venue IDs.

Create a trader page

Join statistics, traded markets and time-series activity to market records.

Chart both outcomes

Request bars at a defined resolution/range and label each outcome separately.

Pricing and total cost

Prediction-market endpoints require Growth or Enterprise. Confirm price and request allowance in the dashboard or sales flow before planning polling frequency.

API access and setup

  1. Create an account with prediction-market access and open GraphQL Explorer.
  2. Run discovery with the intended protocol and exact fields.
  3. Retain full event/market/trader IDs and add pagination, bounded windows and plan-aware limits.

Useful links

What to check

  • Events and individual markets have different identities.
  • IDs contain venue and network parts; titles are not substitutes.
  • Execution requires a separate integration.

A closer look

Ratings & reviews

Editorial rating
3.5/ 5
0 user reviews
PredictionToolkit editorial

Our take on Codex Prediction Markets API

One GraphQL model covers discovery, charts and trader research across venues. Access tiers, prefixed IDs and allowances require careful integration checks.

Assessment criteria
Task usefulness, documented scope, setup clarity, and access and cost transparency.
Assessment date
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Frequently asked questions about Codex Prediction Markets API

Is this OpenAI Codex?

It is the separate Codex market-data service at codex.io.

Can it cover both venues?

Polymarket and Kalshi use protocol filters and venue-specific IDs in the shared schema.

Are trader metrics included?

Statistics, trader-market activity and activity bars are documented.

Is a free plan sufficient?

The prediction-market guide specifies Growth or Enterprise.