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The AgentCard Pay Chrome extension lets your agent detect checkout pages and fill a virtual card into the form automatically — no copy-pasting card numbers.

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Install the extension

agent-cards extension install
Then load it in Chrome:
  1. Open chrome://extensions.
  2. Enable Developer mode.
  3. Click Load unpacked and select ~/.agent-cards/chrome-extension/.
Re-download the latest build any time with agent-cards extension update.

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Autofill flow

With the extension installed and the MCP server connected, your agent can:
  1. Detect — detect_checkout checks whether the current tab is a checkout page and returns a confidence score and detected amount.
  2. Fill — fill_card fills an existing card (by card_id) into the form, or pay_checkout creates a new card sized to the order and fills it in one step.
  3. Submit — You review and submit the form yourself.
These tools require the extension. If it isn’t installed, your agent will prompt you to run agent-cards extension install.