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

# Ecosystem

> Projects and services that integrate AgentKit.

Find places to use AgentKit at [agentbook.world](https://agentbook.world/).
To add your project, open a PR to the [AgentBook registry](https://github.com/andy-t-wang/agentbook).

If you build an agent that calls x402 APIs, use [`createAgentkitClient`](/agents/agent-kit/sdk-reference#createagentkitclientoptions) and call `agentkit.fetch` so the agent tries AgentKit verification before paying. If you cannot change the agent's HTTP client, add the `agentkit-x402` skill:

```bash theme={null}
npx skills add worldcoin/agentkit agentkit-x402
```

<CardGroup cols={2}>
  <Card title="Registration" icon="id-card" href="/agents/agent-kit/integrate#step-2-register-the-agent-in-agentbook">
    Register your agent with World ID to enable human-backed agent benefits.
  </Card>

  <Card title="SDK Reference" icon="code" href="/agents/agent-kit/sdk-reference#createagentkitclientoptions">
    Use `agentkit.fetch` before payment fallback.
  </Card>
</CardGroup>