PolyNode is a real-time data and trading API for Polymarket prediction markets, positioned around a single performance promise: decoded mempool settlements delivered 3-5 seconds before on-chain confirmation via WebSocket. The architecture observes Polygon mempool transactions, decodes the relevant Polymarket exchange events, enriches the payload with market titles / outcome names / slugs / images, then streams to subscribers — eliminating both the latency of waiting for block confirmation and the overhead of secondary lookups against Polymarket's Gamma API.

The data coverage is broad. Subscription channels include fills (individual flat trades), settlements (bundled transactions with lifecycle tracking), confirmed trades, prices, blocks, wallet activity, market events, large-trade alerts, oracle candles, and Chainlink price feeds. REST endpoints cover orderbook access, price history, market conditions, open interest, candles from 1m to 1d resolution, wallet position/P&L time series, copy-trading PnL scoring (single or batch), BYOB and BYOL leaderboards, builder statistics, trending markets, and biggest movers. Webhook delivery is event-driven for trades, price changes, market resolutions, redemptions, position-status changes, and builder-attributed trades.

Official SDKs are maintained in three languages: TypeScript (REST + WebSocket + orderbook streaming + trading), Python (REST + WebSocket + orderbook with state management + trading + error handling), and Rust (REST + WebSocket + orderbook + local cache + short-form markets + redemption watching). All three SDKs support Polymarket V2's bytes32 builder-code format, making PolyNode one of the few infrastructure providers that has shipped the V2 migration.

PolyNode is built by Quantish (GitHub: github.com/joinQuantish — 17 repos, X @joinQuantish, web quantish.live). Important context: Quantish's separate AI-trading-agent platform is publicly winding down as of 2026, with the team announcing they will no longer maintain the Polymarket MCP server. PolyNode itself, however, is a distinct product and remains the team's maintained data infrastructure offering. Authentication uses `pn_live_*` API keys obtainable via `POST https://api.polynode.dev/v1/keys`; the WebSocket URL is `wss://ws.polynode.dev/ws?key=pn_live_YOUR_KEY` with optional `&compress=zlib` reducing bandwidth ~60%.

On-chain traction: #119 all-time on the Polymarket Builders leaderboard with $393.1k cumulative routed volume across 188 unique users. Monthly figures are null — typical for an API where downstream applications carry their own builder codes and PolyNode-direct routing is rare. Pricing tiers are not publicly disclosed beyond references to 'Growth plan or above.' Note: polynode.com is REJECTED as a wrong-URL match — it belongs to the unrelated PolyNode Node.js version manager by sionpixley.