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

# x402 Payment

> The internet-native payment protocol Fast, cheap, and AI-friendly payments over HTTP.

<Tip>
  **Trial x402 Payment**

  Want to experience the real functionality of x402 Payment? Please visit our test environment: [ Algen x402 Payment](https://x402.algen.network/protected)

  Here, you can directly test the blockchain-based micropayment function and experience how the x402 protocol enables on-demand paid access to content.
</Tip>

## How Agents & APIs use x402

<img src="https://mintcdn.com/acoemeta/Psm9hRVnRsPA9QeV/images/web_API_pay_hero.gif?s=86455ec22e131359dcf2a715616ce976" alt="Web API Pay Hero Gi" width="2744" height="1190" data-path="images/web_API_pay_hero.gif" />

### Pay-per-use API models

AI services charge per inference, no subscription needed.

<img src="https://mintcdn.com/acoemeta/MtgeCtsoVRxZaWNJ/images/Visual.svg?fit=max&auto=format&n=MtgeCtsoVRxZaWNJ&q=85&s=b8737a521b18046e830dee678b9f337a" alt="Pay-per-use API models" width="546" height="254" data-path="images/Visual.svg" />

### AI agents accessing APIs

AI tools pay per use for data, compute, or cloud services.

<img src="https://mintcdn.com/acoemeta/MtgeCtsoVRxZaWNJ/images/Visual1.svg?fit=max&auto=format&n=MtgeCtsoVRxZaWNJ&q=85&s=856cbf2b0f9396422fb44ca9fd12457d" alt="AI agents accessing APIs" width="546" height="254" data-path="images/Visual1.svg" />

### On-demand content

Users pay per article, video, or dataset, no subscription required.

<img src="https://mintcdn.com/acoemeta/Psm9hRVnRsPA9QeV/images/on_demand_content.png?fit=max&auto=format&n=Psm9hRVnRsPA9QeV&q=85&s=e54f84289c3225bc363c039117832266" alt="On-demand content" width="1092" height="508" data-path="images/on_demand_content.png" />

### Machine payments

IoT & autonomous systems transact automatically.

<img src="https://mintcdn.com/acoemeta/Psm9hRVnRsPA9QeV/images/machien_payments_small.gif?s=5c78fd587a5d085be93e66225b9acde4" alt="Machine payments" width="1102" height="526" data-path="images/machien_payments_small.gif" />

## Better payments happen onchain

<img src="https://mintcdn.com/acoemeta/Psm9hRVnRsPA9QeV/images/payment_rail_comparison.png?fit=max&auto=format&n=Psm9hRVnRsPA9QeV&q=85&s=0a441c1f4571591043beeb72ca28f5b2" alt="Payment Rail Comparison Pn" width="3840" height="1800" data-path="images/payment_rail_comparison.png" />