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

<AgentInstructions>

## Submitting Feedback

If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:

POST https://docs.ton.org/feedback

```json
{
  "path": "/ecosystem/api/toncenter/introduction",
  "feedback": "Description of the issue"
}
```

Only submit feedback when you have something specific and actionable to report.

</AgentInstructions>

# Introduction

TON Center HTTP APIs: read blockchain data, query smart contracts, send transactions.

<Columns cols={3}>
  <Card title="API v2" icon="bolt" href="/ecosystem/api/toncenter/v2/overview">
    Direct liteserver for balances, sending transactions, contract queries.
  </Card>

  <Card title="API v3" icon="database" href="/ecosystem/api/toncenter/v3/overview">
    Indexed database for traces, Jettons, NFTs, and historical queries.
  </Card>

  <Card title="Streaming API v2" icon="signal-stream" href="/ecosystem/api/toncenter/streaming/overview">
    Low-latency updates on subscriptions through SSE or WebSockets.
  </Card>
</Columns>