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

# API overview

> Browse the Telnyx API reference by product area — AI, voice, messaging, numbers, networking, billing, and OAuth — with endpoints, schemas, and examples.

<CardGroup columns={3}>
  <Card title="AI" icon="sparkles" href="/api-reference/assistants">
    Build assistants, streaming chat, speech, and embeddings with Telnyx Inference APIs.
  </Card>

  <Card title="Real-time communications" icon="phone" href="/api-reference/call-commands">
    Voice, messaging, TeXML, fax, and media APIs for real-time experiences.
  </Card>

  <Card title="Numbers & identity" icon="hash" href="/api-reference/phone-number-search">
    Search, provision, and manage phone numbers, porting, verification, and identity services.
  </Card>

  <Card title="Connectivity & networking" icon="globe" href="/api-reference/sim-cards">
    Wireless SIMs, private networks, WireGuard, and cross-connect APIs.
  </Card>

  <Card title="Account & billing" icon="credit-card" href="/api-reference/billing">
    Billing, payments, notifications, reporting, and account management APIs.
  </Card>

  <Card title="OAuth" icon="lock-closed" href="/api-reference/oauth-clients">
    OAuth 2.0 endpoints for authenticating and managing access to Telnyx resources.
  </Card>
</CardGroup>