Definition
Chain ID
A chain ID is the network identifier wallets and apps use to distinguish one EVM-compatible blockchain from another.
Quick answer
What does chain id mean?
A chain ID is the network identifier wallets and apps use to distinguish one EVM-compatible blockchain from another. Use the definition as context, then compare the exact value on a status page with the linked source documentation before using it in a wallet, script, or application.
Why it matters
This term matters because wallet setup, RPC configuration, and chain selection can affect where transactions are signed and submitted. A familiar label is not enough: users and developers should verify exact network values against source documentation before moving funds or deploying production systems.
On Main.net, glossary pages connect to status pages, guides, gas-token pages, explorer pages, and JSON feeds. Use the definition to understand the concept, then follow the related guide when you need the operational checklist or the current chain fields.
Common verification habit
Before copying a setting from any reference site, compare the term in context with the official project documentation: chain ID with chain ID, RPC URL with RPC URL, gas token with gas token, and explorer host with explorer host. If one value is stale or inconsistent, stop and use the source documentation as the deciding reference.