Polymarket settles on Polygon, an Ethereum-compatible chain with chain ID 137. Bots must be configured for Polygon mainnet rather than Ethereum: the same client library pointed at the wrong chain ID will fail to find markets or produce signatures the exchange rejects.
Low transaction costs on Polygon are what make small, frequent positions economic — the same activity on Ethereum mainnet would be dominated by gas.
Leaving the chain ID at 1. Everything appears configured, and nothing resolves.
Browse the full glossary (32 terms), the strategy database, or the build guides.
