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

# Introduction

> Overview of the DollarPe REST API for pay-in, pay-out, KYC, and webhooks.

This section covers core concepts for calling the DollarPe API: where requests go, how authentication works, how webhooks behave, and how to handle retries safely.

## What you can build

Use the API to move between fiat and stablecoins for your customers: **pay-in** (on-ramp), **pay-out** (off-ramp), **KYC**, **bank accounts**, and **webhooks** for status updates.

<CardGroup cols={2}>
  <Card title="Integration guides" icon="book" href="/api-reference-exchange/integration-guides/kyc-integration-guide">
    Step-by-step flows for KYC, pay-in, pay-out, QR, and EDD.
  </Card>

  <Card title="Developer guides" icon="code" href="/guides/overview">
    Checklists, sandbox testing, errors, and support matrices.
  </Card>
</CardGroup>

## Next steps

<Steps>
  <Step title="Pick an environment">
    Use sandbox for development and production when you go live. See [Endpoints and environments](/guides/development-and-testing/introduction).
  </Step>

  <Step title="Authenticate requests">
    Every call uses signed headers. See [Authentication](/api-reference-exchange/overview/authentication).
  </Step>

  <Step title="Handle events">
    Subscribe to [Webhooks](/api-reference-exchange/overview/webhooks) and design handlers to be [idempotent](/api-reference-exchange/overview/authentication).
  </Step>
</Steps>