Arbitrum Arbitrum Sepolia JSON-RPC Public Ethereum JSON-RPC endpoint for the Arbitrum Sepolia testnet (chain ID 421614). Arbitrum Sepolia JSON-RPC is one of 9 APIs that Arbitrum publishes on the APIs.io network. Tagged areas include JSON-RPC, Testnet, and Sepolia. The published artifact set on APIs.io includes API documentation. Documentation GitHub Documentation 📖 Documentation https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers