> For the complete documentation index, see [llms.txt](https://docs.onyx.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.onyx.org/readme/quick-start.md).

# Quick Start

## Add Onyx Mainnet

The fastest way to add Onyx to MetaMask or another EVM wallet is from the [Onyx Explorer](https://explorer.onyx.org): open the explorer and use the **Add Onyx Network** control in the bottom-left corner for a one-click wallet prompt.

You can also enter the network details manually:

| Setting         | Value                       |
| --------------- | --------------------------- |
| Network name    | Onyx Mainnet                |
| RPC URL         | `https://rpc.onyx.org`      |
| Chain ID        | `327`                       |
| Currency symbol | `XCN`                       |
| Explorer        | <https://explorer.onyx.org> |

For dApp / programmatic wallet setup (`wallet_addEthereumChain`) and RPC `eth_chainId` verification, see [Developer Guide → Getting Started](/developer-guide/getting-started.md).

## Important transaction rules

* XCN is represented with 18 decimals through JSON-RPC, but the native ledger has 8-decimal precision. See [XCN Decimal Handling](/developer-guide/decimal-handling.md).
* A transfer to a new address can require substantially more gas because the account is created on first receipt. Always use `eth_estimateGas`; never hardcode `21,000`. See [Lazy Account Creation](/developer-guide/lazy-create-gas.md).
* Read `eth_gasPrice` when preparing a transaction and handle RPC errors instead of assuming Ethereum Mainnet fee-market behavior. See [Network Fees](/developer-guide/network-fees.md) for the current snapshot, calculation, and USD denomination.


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