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

# Overview

> Unspent-output lookup for transaction building

# UTXO Monitor

Base URL: `https://utxo-monitor.snek.fun`

A lightweight service that returns the unspent transaction outputs (UTXOs) owned by a given wallet. The [Transaction Builder](/api-reference/transaction-builder/overview) relies on the UTXO Monitor to resolve coin selection when you pass `utxos: "splash-wallet"` — so most users don't call this directly.

Call it yourself when you want to:

* Inspect the live UTXO set for a wallet
* Build transactions client-side with explicit UTxO inputs
* Monitor balance changes between blocks

**Auth:** Public — no credentials required.

## Endpoint

See [`POST /getUtxos`](/api-reference/utxo-monitor/get-utxos).