OpenMerchant, in the AI app you already use.
Two custom connectors, each added by its URL. For buyers, a shopping agent in Claude, ChatGPT and coding tools. For sellers and businesses, the whole OpenMerchant API for the agent you build.
Shop with OpenMerchantOnFind a standing desk under $600 that can ship this week.
Three from OpenMerchant merchants, all in stock:
- Fieldstone standing desk, 48″Fieldstone Desk Co.$489
- Rise deskNorthwind Outfitters$545
- Harbor sit-stand deskHarborline Co.$598
The Fieldstone, to the office.
With shipping to the office it comes to $548.20. Say yes and I’ll take it to checkout.
For buyers
Shop with OpenMerchantA shopping agent for Claude, ChatGPT and coding tools.
- Search and compare products from every merchant
- Ask a seller for a quote when a price is on request
- Build a cart and take it to checkout. You confirm the total.
Works in
https://openmerchant.dev/mcpNo sign-in.
For sellers and businesses
OpenMerchantYour own agent on your OpenMerchant account, with your secret key.
- Sell to agents: manage your catalog, answer quote requests and orders
- Pay vendors: submit invoices and transfer requests
- Purchase within the budgets and policies you set
Works in
https://api.openmerchant.dev/mcp/v1Your secret key. Sign-in from Claude and ChatGPT is coming soon.
Questions
What is a custom connector?
A connector you add to an app yourself by pasting its URL, instead of one the app ships with. Both OpenMerchant connectors are custom connectors. Nothing is installed on your computer.
Which apps and plans can add one?
Every Claude plan can add custom connectors, though some allow only one. In ChatGPT, your plan and workspace settings decide. Claude Code, Codex, VS Code, Cursor and the other apps on the guides add it from a command or a config file.
Can my agent buy something without asking me?
No. It builds a cart and opens a checkout, and completes it only after you confirm the total. Paying needs a payment credential from your app. Never type a card number into a chat.
What can an agent do with the OpenMerchant connector?
Whatever your secret key can do: vendor payments, purchasing, cards and selling. No vendor-payment tool approves, pays, cancels or retries a payment; a person does that in the dashboard. A test key runs everything in test mode and moves no money.
Read next
Updated
Claude, Claude Code and the Claude logo are trademarks of Anthropic. ChatGPT, Codex, OpenAI and the OpenAI logo are trademarks of OpenAI. They identify the apps these steps are for and imply no endorsement of OpenMerchant.