Codex
A GraphQL API for real-time token and prediction market data across 80+ networks, covering 80M+ tokens and 700M+ wallets.
Overview
Codex is a GraphQL API for enriched blockchain and prediction market data, built and maintained by Defined.fi. For tokens, it delivers real-time pricing, charts, holders, balances, and aggregated analytics covering more than 80 million tokens and 700 million wallets across over 80 networks, spanning EVM chains and Solana. Data arrives with sub-second freshness and includes historical USD pricing, with WebSocket and webhook subscriptions for live updates.
Codex also exposes prediction market data across Polymarket and Kalshi through a single schema. This covers events, markets, traders, holdings, live order books, and trade feeds, along with time-windowed stats and ranking signals such as volume, liquidity, open interest, trade count, and unique traders at windows from 5 minutes through 1 week, metrics the venue APIs do not expose natively.
Most teams query Codex directly over GraphQL, with an optional TypeScript SDK, and there is an MCP server for reading the documentation. Codex offers a free tier of 10,000 requests per month, usage-based Growth pricing, and Enterprise plans. Developers use it to build trading platforms, wallets, analytics tools, and prediction market apps. Getting started takes an API key from codex.io and the schema reference at docs.codex.io.
The Problem
Teams building trading apps, wallets, and analytics tools have to assemble real-time token data from many per-chain sources, then bolt on separate, inconsistent feeds for prediction markets. Native venue APIs lag, lack historical pricing, and do not expose aggregated ranking signals, so developers spend more time on data plumbing than on their product.
The Solution
Key Features
Token Data Across 80+ Networks
Real-time pricing, charts, holders, and balances for 80M+ tokens and 700M+ wallets across EVM chains and Solana, with sub-second freshness.
Prediction Market Schema
A single GraphQL schema for Polymarket and Kalshi covering events, markets, traders, holdings, live order books, and trade feeds.
Live Subscriptions
WebSocket and webhook subscriptions push price updates, trades, and on-chain events as they happen, with historical USD pricing on demand.
Key Strengths
How Developers Use Codex
Build a Trading Platform
Power token discovery, charts, and live pricing for a spot or perps trading interface with one data API.
Enrich a Wallet
Show real-time balances, USD valuations, and holder analytics across 80+ networks inside a wallet app.
Track Prediction Markets
Pull Polymarket and Kalshi events, order books, and ranking signals to build analytics or a prediction-market app.
Works Well With
Ethereum
Solana
Base
Arbitrum One
Optimism
BNB Smart Chain
Avalanche
Polygon PoS
Ship faster than your competition
Free RPC across 77+ chains. Spin up an endpoint in under 30 seconds.
Compare
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Start Building Now
Reliable RPC, powerful APIs, and zero hassle.
Resources
Codex lives at codex.io with full schema and guides at docs.codex.io. The API is GraphQL with an optional TypeScript SDK and an MCP server for reading the docs. Support and updates run through X (@trycodex), Discord (discord.com/invite/mFpUhT3vAq), and LinkedIn, and source and examples are on GitHub at github.com/Codex-Data.