Crypto glossary
Crypto portfolio tracker
A crypto portfolio tracker is an app that combines balances and transactions from several wallets and exchanges to show holdings, performance and tax data.
Trackers collect data in three main ways: reading public blockchain addresses or extended public keys, connecting to exchanges through read-only API keys, and importing CSV files. They then price each asset, calculate gains and losses and group positions by chain, platform or category. More advanced tools decode DeFi positions such as liquidity pools, staking and lending.
Anyone holding assets across more than a couple of venues uses one, because no single exchange or wallet shows the full picture. Trackers also feed tax reports, since calculating cost basis by hand across hundreds of trades is impractical, and some double as watch-only wallets that alert users to incoming transfers or approval risks.
Privacy is the main trade-off: linking every address and account to one service creates a detailed record of a person's wealth, and a breach could expose it to criminals. API keys should be read-only, with trading and withdrawal permissions disabled. Figures are only as good as the data: missing transfers, unpriced tokens and DeFi positions often produce wrong balances or tax numbers that need checking.
Example
An investor adds her Ethereum address, her Bitcoin xpub and read-only API keys from two exchanges to a tracker and sees her combined holdings and realised gains for the year in one screen.