> 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/developer-guide/decimal-handling.md).

# XCN Decimal Handling

Correctly convert native XCN between ledger and JSON-RPC units.

Native XCN has two representations:

| Context       | Precision                                  |
| ------------- | ------------------------------------------ |
| Native ledger | 8 decimals (`1 XCN = 100,000,000 tinyxcn`) |
| EVM JSON-RPC  | 18-decimal wei-style integers              |

One `tinyxcn` therefore equals `10^10` JSON-RPC units. Native XCN values sent through JSON-RPC must be a multiple of `10^10`.

```javascript
const RPC_UNITS_PER_TINYXCN = 10n ** 10n;

function alignNativeXcn(value) {
  return value - (value % RPC_UNITS_PER_TINYXCN);
}
```

This rule applies to native XCN only. ERC-20 tokens use the value returned by their own `decimals()` function. Current examples include WXCN and bridged ETH with 18 decimals, bridged USDC with 6, and stXCN with 18.

Do not use JavaScript `BigInt` directly in protobuf-js `int64` fields. For native SDK code, use the integer type required by that SDK and keep the unit conversion explicit.


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