> For the complete documentation index, see [llms.txt](https://docs.blockpay.gg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blockpay.gg/welcome.md).

# Welcome

**BlockPay** is an open-source payment infrastructure for the agentic economy. It brings the [x402 open standard](https://www.x402.org/) to the [Sui](https://sui.io/) blockchain, letting any API, service, or autonomous agent charge and pay per request over plain HTTP with no accounts, no API keys, no subscriptions.

This documentation is organized into three sections:

* **Disclaimer:** what BlockPay is and, just as importantly, what it is not. Please read this first.
* **Introduction:** the vision, why BlockPay exists, and who it's for.
* **Protocol:** the high-level architecture, the payment flow, and the role of the Facilitator.
* **Integration:** how to install the `@blockpay402/*` SDK packages and start accepting or making payments.

### Quick links

| Resource            | Link                              |
| ------------------- | --------------------------------- |
| npm organization    | `@blockpay402/*` on npm           |
| Underlying standard | [x402.org](https://www.x402.org/) |
| Settlement layer    | [Sui](https://sui.io/)            |

> **Status: Experimental.** BlockPay is under active development. Interfaces, schemes, and on-chain contracts may change without notice. See the Disclaimer before building anything serious on top of it.


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