> For the complete documentation index, see [llms.txt](https://docs.xplug.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xplug.io/readme.md).
# Developer Platform
Welcome to the xPlug Documentation
Your gateway to x402 mass adoption on Solana.
:leaf:
Getting Started
Understand the xPlug ecosystem and how Plug-and-Pay works.
{% columns %}
{% column %}
### Start building with xPlug in minutes
Getting started with xPlug SDK takes just a few lines of code. Connect your Solana app to x402 for verified, trustless payments fast, simple, and secure.
No setup friction. No manual validation. Just Plug and Pay.
Get startedFacilitator API
{% endcolumn %}
{% column %}
{% code title="index.js" overflow="wrap" %}
```javascript
// Import the SDK
import ExampleAPI from "example-api";
// Initialize the client
const client = new ExampleAPI({ apiKey: "YOUR_API_KEY" });
// Send your first message
const response = await client.messages.send({
message: "Hello, world!"
});
```
{% endcode %}
{% endcolumn %}
{% endcolumns %}
{% columns %}
{% column %}
{% endcolumn %}
{% column %}
### Learn more about xPlug ecosystem
Explore detailed guides and API documentation for both developers and non-technical users.
GuidesDocumentation
{% endcolumn %}
{% endcolumns %}
Join the xPlug Community
Be part of the movement bringing x402 mass adoption to Solana.
:x-twitter:
Follow to explore how x402 payments reach everyone on Solana. The era of Plug and Pay begins.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.xplug.io/readme.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
