Replay
Developer InfrastructureReplay is a time-travel debugger for Solana. Paste any mainnet transaction signature -- Replay fetches the exact account state at that slot via Helius, reconstructs it in a LiteSVM sandbox, and re-executes the transaction locally. You get a full CPI trace: every cross-program invocation, compute units, and IDL-decoded account fields. Fork the session, mutate any account, re-run, and diff. See exactly what changed and why. Available as a web UI, CLI, and published SDKs for TypeScript and R