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

# Client Introduction

> Learn how to support x402 in your client

## Why use x402 with your client

x402 standardizes how clients discover payment requirements, construct payment payloads, and complete on-chain payments for HTTP resources. Benefits include:

✅ Customers don't pay network fees.\
✅ Merchants don't pay network fees.\
✅ Payment settles in \< 1 second.\
✅ Universal compatibility -- if it speaks HTTP, it speaks x402.

## Architecture at a glance

<img src="https://mintcdn.com/payai/4LHfgOPrYQU9GWE8/images/x402-sequence-diagram.svg?fit=max&auto=format&n=4LHfgOPrYQU9GWE8&q=85&s=f9a5356f8d04bfa03987fe5a8d8d0db4" alt="x402 sequence diagram" width="1992" height="1570" data-path="images/x402-sequence-diagram.svg" />

* **Client (buyer)**: Calls protected resources and constructs payment payloads.
* **Server**: Advertises payment requirements, verifies/settles payments, fulfills requests.
* **Facilitator**: Verifies and/or settles payments for the resource server.
* **Blockchains**: Execute and confirm payments.

## Getting started

Select one of the quickstart examples, or read the [reference](/v1/x402/reference) for more details.

<Tabs>
  <Tab title="TypeScript">
    <CardGroup>
      <Card title="Axios" href="/v1/x402/clients/typescript/axios" icon="code">
        Quickstart for building an x402 client with Axios.
      </Card>

      <Card title="Fetch" href="/v1/x402/clients/typescript/fetch" icon="code">
        Quickstart for building an x402 client with Fetch.
      </Card>
    </CardGroup>
  </Tab>

  <Tab title="Python">
    <CardGroup>
      <Card title="httpx" href="/v1/x402/clients/python/httpx" icon="code">
        Quickstart for building an x402 client with httpx.
      </Card>

      <Card title="requests" href="/v1/x402/clients/python/requests" icon="code">
        Quickstart for building an x402 client with requests.
      </Card>
    </CardGroup>
  </Tab>
</Tabs>

## x402 reference

For a deeper dive into message shapes, headers, verification and settlement responses, see the <a href="/v1/x402/reference">x402 Reference</a>.

## Need help?

<Card title="Join our Community" icon="discord" href="https://discord.gg/eWJRwMpebQ">
  Have questions or want to connect with other developers? Join our Discord server.
</Card>