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docs: clarify USDC decimal representations
sanjeebdas1979 Aug 16, 2026
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docs: address USDC decimals review feedback
sanjeebdas1979 Aug 16, 2026
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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -30,7 +30,22 @@ Arc is an open EVM-compatible layer 1 built on [Malachite](https://github.com/ci
- 🚀 **[Execution](crates/node/README.md)** - Execution binary and configuration
- 🗳️ **[Consensus](crates/malachite-app/README.md)** - Consensus binary and configuration
- More: see Arc [developer docs](https://docs.arc.io/arc/concepts/welcome-to-arc) for guides, APIs, and specs
## USDC units and decimals

Arc exposes USDC as both the native token and through an ERC-20 interface. These
interfaces use different decimal representations:

- The ERC-20 USDC interface uses **6 decimals**.
- Native balance and native-value accounting use **18-decimal units**.
- Converting an ERC-20 USDC amount to native units multiplies the amount by
`10^12`.

For example, 1 USDC is represented as `1_000_000` through the ERC-20 interface
and as `1_000_000_000_000_000_000` in native units.

When integrating with Arc, applications should use the decimal representation
expected by the interface they are interacting with rather than assuming the
same unit scale for both representations.
## Install and Run a Node

### Install
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