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Overview

Bitcoin developers regularly need to map an xpub to every address it derives — and to know which of those addresses have actually been used. The xpub utility solves that natively. Pass a Bitcoin extended public key (xpub), and the API returns every derived address with its transfer count. No client-side derivation library required.

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Endpoint

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Pairing With the Wallet API

The Wallet API endpoints accept either an address or an xpub directly. For most flows you don’t need to call the utility endpoint first — the API derives the addresses server-side. Use the utility endpoint when you need to enumerate and display the derived addresses themselves — for example a wallet UI that surfaces “this xpub controls the following addresses,” or an analytics pipeline that wants to track each derived address independently.