Real-Time Polymarket Price Mirror App

Senior Frontend / WebSocket Engineer – Real-Time Polymarket Price Mirror (Exact UI Matching) I need an experienced developer to build a lightweight single-page web app that mirrors Polymarket prices exactly — including update speed and displayed values. This is NOT a basic polling widget. The goal is to replicate the exact displayed probability values shown on the official Polymarket frontend, without showing raw orderbook noise (e.g., 90/90 or 50/50 spikes). Scope: • Input field for Polymarket event URL (or 0x market address) • Parse event ID • Fetch all associated markets under that event • For binary markets: render YES and NO side-by-side inside a single clean rectangle • For multi-outcome markets: render each outcome cleanly grouped per market • Display only final probability values (no bid/ask, no volume, no labels) • Continuous real-time updates • Must match Polymarket frontend price exactly — not “almost”, not “close” Technical requirements: • Use the same validated price state endpoints the Polymarket frontend uses • Do NOT rely solely on raw orderbook websocket feed • Implement a validation/filtering layer to eliminate transient noise • Updates must be fast and stable • No frameworks required, but React or vanilla JS acceptable • Deliverable must be deployable on standard hosting (simple folder drop) Important: This requires inspecting the Polymarket frontend network calls and replicating the displayed pricing logic. If you have not worked with market data streaming or websocket feeds before, do not apply. Deliverables: • Working HTML/CSS/JS build • Clean commented code • Short readme explaining setup • Demo showing real-time parity with a live market Acceptance criteria: when I enter any current Polymarket URL, the page displays two continually updating numbers inside the rectangle exactly as specified.

Project ID: 40268707