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8 changes: 8 additions & 0 deletions docs/overview.mdx
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Expand Up @@ -27,3 +27,11 @@ These are the RPC endpoints you can use in your applications to interact with th
**Mainnet**: https://mainnet.fuel.network/v1/graphql

> Note that this is the same endpoint used in the playground above.

## Chain Id

A chain ID is a unique identifier assigned to a blockchain network, whether a testnet or a mainnet (Fuel Ignition), to ensure correct transaction signing and prevent replay attacks across chains.

**Testnet**: [`0`](https://github.com/FuelLabs/chain-configuration/blob/master/ignition-test/chain_config.json#L41)

**Mainnet**: [`9889`](https://github.com/FuelLabs/chain-configuration/blob/master/ignition/chain_config.json#L41)
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