---
title: Pay from Agents SDK
description: Use withX402Client to pay for resources from a Cloudflare Agent.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/agents/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Pay from Agents SDK

The Agents SDK includes an MCP client that can pay for x402-protected tools. Use it from your Agents or any MCP client connection.

TypeScript

```
import { Agent } from "agents";import { withX402Client } from "agents/x402";import { privateKeyToAccount } from "viem/accounts";
export class MyAgent extends Agent {  // Your Agent definitions...
  async onStart() {    const { id } = await this.mcp.connect(`${this.env.WORKER_URL}/mcp`);    const account = privateKeyToAccount(this.env.MY_PRIVATE_KEY);
    this.x402Client = withX402Client(this.mcp.mcpConnections[id].client, {      network: "base-sepolia",      account,    });  }
  onPaymentRequired(paymentRequirements): Promise<boolean> {    // Your human-in-the-loop confirmation flow...  }
  async onToolCall(toolName: string, toolArgs: unknown) {    // The first parameter is the confirmation callback.    // Set to `null` for the agent to pay automatically.    return await this.x402Client.callTool(this.onPaymentRequired, {      name: toolName,      arguments: toolArgs,    });  }}
```

For a complete working example, see [x402-mcp on GitHub ↗](https://github.com/cloudflare/agents/tree/main/examples/x402-mcp).

## Environment setup

Store your private key securely:

Terminal window

```
# Local development (.dev.vars)MY_PRIVATE_KEY="0x..."
# Productionnpx wrangler secret put MY_PRIVATE_KEY
```

Use `base-sepolia` for testing. Get test USDC from the [Circle faucet ↗](https://faucet.circle.com/).

## Related

* [Charge for MCP tools](https://developers.cloudflare.com/agents/tools/payments/x402/charge-for-mcp-tools/) — Build servers that charge for tools
* [Pay from coding tools](https://developers.cloudflare.com/agents/tools/payments/x402/pay-with-tool-plugins/) — Add payments to OpenCode or Claude Code
* [Human-in-the-loop guide](https://developers.cloudflare.com/agents/concepts/agentic-patterns/human-in-the-loop/) — Implement approval workflows

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