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I open-sourced a UE4 plugin + Node.js backend for building onchain game flows on @Arc testnet using Blueprint nodes (USDC + NFTs).

Repo: https://github.com/fawazdevx/arc-unreal-plugin

> Pay / reward USDC via backend (server-signed tx)

- SETUP.md (fastest path): https://github.com/fawazdevx/arc-unreal-plugin/blob/main/SETUP.md

- DOC.md (architecture + customization): https://github.com/fawazdevx/arc-unreal-plugin/blob/main/DOC.md

Write operations require signing + gas, so the flow is UE4 client → backend API → @Arc RPC (no private keys in the client).

- If backend is running in WSL, Unreal on Windows may need your WSL IP (not localhost).

- USDC has 6 decimals (5 USDC = 5,000,000 raw units).

UE4 on @Arc: Blueprint-first plugin for USDC balance + pay/reward + mint NFTs (setup guide + video)

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