Polymarket confirmed on Friday, December 19, 2025, that it has fully restored all platform services following a major disruption caused by a critical outage on the Polygon network that began during the previous trading session.
The decentralised prediction market said the incident started on December 18, when Polygon experienced block synchronisation issues that affected applications relying on its Layer 2 infrastructure.
While some users were still able to access Polymarket’s front-end interface, core trading functions were significantly impaired due to delays in on-chain data updates.
Polymarket stated that real-time market pricing and order book activity were temporarily suspended to prevent users from interacting with inaccurate or outdated information.
The company said the root cause of the outage was a failure in its data ingestion subgraphs, which are responsible for indexing blockchain events and translating them into market data.
When Polygon’s block production slowed, these subgraphs were unable to process new transactions, leading to stale prices across multiple active markets.