Solana infrastructure provider Helius has launched Balance-At, an API endpoint that returns a wallet's exact SOL or SPL token balance at any past date, time or slot in a single call.

It replaces the brittle, multi-step RPC queries developers previously had to stitch together by hand, turning historical balance lookups into one request.

Helius pitches it for PnL tracking, portfolio charts, snapshots and cost-basis math. The endpoint ships as part of the Wallet API, currently in beta.