Pay from Agents SDK

Last updated Jun 3, 2026 The Agents SDK includes an MCP client that can pay for x402-protected tools. Use it from your Agents or any MCP client connection.

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 ↗︎.

Environment setup

Store your private key securely:

# Local development (.dev.vars)
MY_PRIVATE_KEY="0x..."

# Production
npx wrangler secret put MY_PRIVATE_KEY

Use base-sepolia for testing. Get test USDC from the Circle faucet ↗︎.

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description: Add x402 payment handling to OpenCode and Claude Code. title: Pay from coding tools image: https://developers.cloudflare.com/agents/tools/payments/x402/pay-with-tool-plugins/og.png?v=00afef328aa9b66e

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