df-elysium-core covers Elysium's own RPC (Arbitrum Nitro), its built-in system contracts (ArbOS precompiles), gas, the HyperEVM bridge both ways and its retryable tickets, contract deploys and polling, with signing included. Built on the same author's Hyperliquid library, and compiled to WebAssembly for web apps. A reference app shows it working in the browser on the Elysium testnet.

On ElysiumPublished on Oct 25 (version 0.0.1-beta) by the founder of perps.studio, who also built Reactor Perps with it. Its reference app runs on the Elysium testnet: elysium-sdk-app.builder.markets.

It's running or deployed on the Elysium testnet today.