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AutoPay is a Chromium extension that lets you fund a wallet for browser-based micropayments and automatically pays for any x402 API endpoint it encounters. While x402 is primarily designed for agent-to-agent payments, AutoPay extends that model to human users browsing the web. A basic demo video of how it works is here:

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Install AutoPay

The extension is not yet available on the Chrome Web Store. Install it manually using one of two approaches.

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Option A: Download zip

Download the latest release zip from https://github.com/Swader/x402autopay/releases and unpack it.

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Option B: Clone and build

  1. Clone the repository:
git clone https://github.com/Swader/x402autopay
  1. Install the dependencies:
bun install
  1. Build the extension:
bun run build

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Load the extension in Chrome

Whichever approach you used, load the extension in Chrome:
  1. Open the Extensions page in your browser.
  2. Enable Developer mode.
  3. Click Load unpacked.
  4. Select the dist folder: either the one created by bun run build, or the folder you unpacked from the zip file.

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Use AutoPay

A video walkthrough is also available:
On first use, AutoPay prompts you to import or create a wallet and fund it.
Screenshot placeholder: wallet setup screen.
Set a passphrase to encrypt the wallet. The wallet stays unlocked for 15 minutes by default. To back up the wallet, click Back Up, enter your passphrase, and store the displayed private key in a secure location. Fund the wallet by sending USDC on Polygon to the displayed address. The balance refreshes automatically, or you can click Refresh to update it manually.
Screenshot placeholder: wallet funding screen.
When the extension detects a 402 Payment Required response, it shows an approval popup. Approve the payment and optionally set a “no ask” threshold for that site so future payments below that amount are approved automatically. Policies are configured per site and per currency.
Screenshot placeholder: payment approval screen.
View all site policies and payment history in the extension popup.
Screenshot placeholder: policies and history screen.

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Planned Features

  • In-extension on-ramps to buy USDC without leaving the popup
  • Pre-emptive site policy configuration before encountering a paywall
  • x402 V2 support for fiat payments
To suggest improvements, open an issue or PR on the source repo.