You can connect your uBuyFirst account to an AI assistant and run it by asking in plain words. For example:
- “Search eBay for a Nintendo Switch OLED under $250.”
- “What did my alerts find overnight?”
- “Create an alert for a Leica M6 under $1,500.”
- “Pause my camera searches.”
- “Block the seller cheap_deals_123 from my alerts.”
The assistant can search eBay live, and it can read and change your saved searches, alerts, folders, item filters, blocklists and notification channels. This connector cannot buy, bid, pay or message sellers.
If you use uBuyFirst Post-Sale for the orders you bought on eBay, it has a connector of its own: see “Post-Sale: your eBay orders” below.
What you need #
- A uBuyFirst account. You sign in to it when the assistant asks.
- One of the apps below. Each section says which plans can add it.
The address to paste in each app is:
https://app.ubuyfirst.com/mcpClaude #
- In Claude, go to Customize → Connectors, choose + Add, then Add custom connector.
- Paste the address above.
- Sign in to uBuyFirst in the window Claude opens.
Claude Free allows one custom connector. On Claude Team or Enterprise, an owner adds connectors first.
Claude Code #
- Run this in a terminal. It adds uBuyFirst to every project:
claude mcp add --transport http --scope user ubuyfirst https://app.ubuyfirst.com/mcp- In Claude Code, type
/mcp, pick ubuyfirst and sign in in the browser window that opens.
Already added uBuyFirst in Claude? Claude Code picks up your Claude connectors when you sign in with the same Claude account.
ChatGPT #
This works on the ChatGPT website (not the mobile app), with ChatGPT Plus, Pro, Business, Enterprise or Edu. On Business, only workspace admins and owners can add it. On Enterprise and Edu, an admin may need to allow you first. OpenAI’s help center says only Business, Enterprise and Edu can make changes through it, so on Plus and Pro, ChatGPT can only read.
- On the ChatGPT website, go to Settings → Security and login and turn on Developer mode.
- Open Plugins (chatgpt.com/plugins), choose + → Add custom MCP server, and paste the address above.
- Sign in to uBuyFirst in the window ChatGPT opens.
- In a chat, choose + → Developer mode and pick uBuyFirst.
Codex #
- Run these in a terminal. They work for the Codex app, the CLI and the editor extension:
codex mcp add ubuyfirst --url https://app.ubuyfirst.com/mcp
codex mcp login ubuyfirst- The
logincommand opens a browser window. Sign in to uBuyFirst there.
Another app #
Look for “custom connector”, “remote MCP server” or “add server by URL”, and paste the address above.
Post-Sale: your eBay orders #
uBuyFirst Post-Sale tracks what you bought on eBay after the sale. Its connector lets the assistant work with those orders. For example:
- “Which of my orders still need feedback?”
- “How much have I spent with each seller this month?”
- “Add a note to my Canon EOS R6 order: shutter count checked.”
- “Set the Triage status of my Dell Latitude order to Tested complete.”
- “Message the seller of my Pixel 8 Pro order and ask when it ships.”
The assistant can find and read your orders, with their statuses, notes, history and messages with the seller. It can change statuses, notes, tags and custom fields, archive orders, mark them received, and add up what you spent. It can message a seller, leave feedback and reply to the feedback a seller left you. It cannot buy, bid, pay, refund or open a return.
You need an eBay account connected to Post-Sale.
This page is about apps outside uBuyFirst. The Post-Sale AI assistant built into Post-Sale is separate and changes an order only when you confirm it: see Post-Sale Management: AI Assistant.
Turn it on #
Post-Sale is off for other apps until you turn it on:
- In uBuyFirst, open Settings → Account and find What other apps can reach.
- Turn on Post-Sale. The assistant can then read your orders.
- Turn on what else it may do:
- Change orders and setup: statuses, notes, tags, archiving, and your Post-Sale settings.
- Message sellers: messages to sellers, and the automatic Item received message.
- Leave feedback: public feedback for the sellers you bought from.
The same switches also apply to your API key and the command line. The command-line tool runs as npx ubuyfirst; in Windows PowerShell, type npx.cmd ubuyfirst instead.
Add it #
The Post-Sale address is:
https://app.ubuyfirst.com/psm-mcpIn Claude and ChatGPT, add it the same way as the address above. It is a connector of its own, and Claude Free allows only one custom connector.
In Claude Code, run this, then type /mcp, pick ubuyfirst-post-sale and sign in:
claude mcp add --transport http --scope user ubuyfirst-post-sale https://app.ubuyfirst.com/psm-mcpIn Codex, run these. The login command opens a browser window to sign in:
codex mcp add ubuyfirst-post-sale --url https://app.ubuyfirst.com/psm-mcp
codex mcp login ubuyfirst-post-saleWhat it sends #
- A message, feedback or a reply to feedback goes to eBay from your own eBay account, as if you had sent it in Post-Sale. Feedback and replies are public on eBay, and eBay does not let you change a reply.
- Marking an order received, or setting its Receiving status to Received, sends the seller your Item received message, if you set one up in Post-Sale, unless Message sellers is off. You can also ask the assistant not to send it.
- In Claude’s Manual permission mode, Claude asks before it uses any Post-Sale tool, including one that changes an order or sends something, unless you chose to always allow that tool. In Auto mode, Claude may use a tool without asking, even one set to Needs approval. An automated check blocks the actions it flags as risky, and Claude pauses to ask if anything looks unsafe. ChatGPT asks for your approval before a send, unless you chose to always allow it.
Your data #
The assistant only reaches the uBuyFirst account you sign in with. Our privacy policy lists what uBuyFirst sends to the assistant, under “Connecting uBuyFirst to AI Assistants”.
Disconnect #
Remove uBuyFirst in the same place you added it. In Claude Code, run claude mcp remove --scope user ubuyfirst. In Codex, run codex mcp remove ubuyfirst. For Post-Sale, use ubuyfirst-post-sale in those commands. Turning off the Post-Sale switch in Settings → Account stops every app from reaching your orders at once.
If something goes wrong #
- “No uBuyFirst account is linked to this login yet.” Sign in once at https://app.ubuyfirst.com with the same login, then try again.
- “Post-Sale is switched off for other apps on this account.” Turn on the Post-Sale switch, as in “Turn it on” above.
- “Message sellers” (or “Leave feedback”, or “Change orders and setup”) “is switched off for other apps on this account.” Turn on that permission in the same place.
- The sign-in window does not open. Allow pop-ups for the app, or try again from a browser.
- Still stuck? Contact us at https://ubuyfirst.com/support/.
