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

# BoltzPay

> Open-source SDK that gives AI agents a fetch() that pays — x402, L402, and MPP.

BoltzPay is an open-source TypeScript SDK that lets AI agents pay for API data automatically. One `fetch()` call handles detection of three protocols — x402, L402, and MPP — signs the payment, and returns data. Your agent gets the response, the server gets paid. Browse thousands of scored endpoints on the [BoltzPay Registry](https://status.boltzpay.ai).

<CardGroup cols={2}>
  <Card title="SDK" icon="code" href="/getting-started/installation">
    Drop-in `fetch()` replacement. Detects x402, L402, and MPP endpoints, signs payments, returns data.
  </Card>

  <Card title="Sessions" icon="arrows-rotate" href="/concepts/sessions">
    `openSession()` for streaming MPP endpoints with payment channels. Per-voucher budget enforcement.
  </Card>

  <Card title="Claude Desktop" icon="message-bot" href="/guides/mcp-claude-desktop">
    MCP tools for discovering, quoting, diagnosing, and paying for APIs through natural language.
  </Card>

  <Card title="Registry" icon="chart-bar" href="/concepts/registry">
    Browse 5,700+ scored endpoints from status.boltzpay.ai. Filter by protocol, score, category.
  </Card>

  <Card title="CLI & Python" icon="terminal" href="/guides/cli">
    Check prices, discover APIs, and fetch paid data from your terminal or Python code.
  </Card>

  <Card title="Integrations" icon="puzzle-piece" href="/integrations/vercel-ai-sdk">
    Vercel AI SDK, LangChain, CrewAI, n8n. Add BoltzPay tools in a few lines.
  </Card>

  <Card title="Your Keys" icon="key">
    Non-custodial. Coinbase, NWC, Tempo, or Stripe credentials stay on your machine.
  </Card>
</CardGroup>