> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prismapi.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

> Learn about the core building blocks of Prism's Solana assets analytics.

## Transfer

A **transfer** is a single token movement between two wallets emitted by a Solana transaction. Transfers capture the directional flow of value across the ecosystem — who sent what, to whom, and for how much.

By indexing every SPL token and native SOL transfer at the instruction level, Prism gives you a complete, unbiased view of on-chain asset movement.

## Balance Change

A **balance change** is the delta applied to a wallet's holding of a specific token within a single transaction. Each balance change records the pre- and post-transaction balance, regardless of whether the cause was a transfer, swap, fee payment, or program-level mutation.

Balance changes are the source of truth for wallet state: by replaying them you can reconstruct a wallet's full token holdings at any point in time.