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

# API Overview

> Voltr REST API for querying vault data and building transactions

Welcome to the Voltr REST API. This API provides developers with the tools to query on-chain and off-chain vault data, calculate metrics, and construct transactions for interacting with Voltr vaults.

<Tip>
  Building deposit/withdraw flows with a coding agent? The [Voltr Agent Skill](/explore/agent-skill) ships a `depositor-and-api.md` reference and runnable `examples/depositor/` flows covering both the SDK and this REST API.
</Tip>

## Base URL

All API endpoints are relative to: `https://api.voltr.xyz`

## Authentication

The Voltr API is public and does not require an API key for access.

## Key Concept: Transaction Building

A critical feature of the Voltr API is its approach to transaction creation. Instead of executing transactions on the server, the API **builds and returns an unsigned, serialized versioned transaction** as a base58 encoded string.

This design ensures that user private keys are never required on the backend, maintaining a non-custodial and secure user experience.

### Typical Workflow

<Steps>
  <Step title="Request">
    Your application sends a `POST` request to a transaction creation endpoint (e.g., `/vault/{pubkey}/deposit`).
  </Step>

  <Step title="Receive">
    The API returns a JSON response containing the serialized transaction string.
  </Step>

  <Step title="Sign & Send">
    Your client-side application deserializes this string, signs it with the user's wallet, and sends it to the Solana network.
  </Step>
</Steps>

```json theme={null}
{
  "success": true,
  "transaction": "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAI..."
}
```

## Interactive Documentation

For live testing and a detailed, interactive view of all endpoints, visit the Swagger documentation:

<Card title="Swagger API Docs" icon="arrow-up-right-from-square" href="https://api.voltr.xyz/docs">
  Interactive API documentation with live testing
</Card>