Add Deal.ai to ChatGPT and you can ask, mid-conversation, what every store charges for the same item, which deals are live right now, and whether the price in front of you is a good one. Answers link to each store and to the Deal.ai page behind them.
Deal.ai's listing in ChatGPT's app directory is under review. Until it's listed, add it as a custom MCP server: it takes a minute and a free Deal.ai account.
Server address (Streamable HTTP, OAuth sign-in)
https://deal.ai/mcpChatGPT's menus differ between plans and change from time to time; if a name below differs, look for apps, plugins or connectors in ChatGPT's settings.
In ChatGPT on the web, open the page where you add apps (in current ChatGPT, Plugins), choose +, then Add custom MCP server.
If there's no option to add your own server, turn on developer mode in ChatGPT's settings (at the time of writing, under Apps, in advanced settings). In a Business or Enterprise workspace, an admin may need to allow custom MCP servers first.
Name it Deal.ai, enter the server address above (it ends in /mcp) and choose OAuth for authentication. ChatGPT shows a risk warning for custom servers; read it and continue.
Deal.ai's sign-in opens. Log in or create a free account; Deal.ai shows which app is asking and the account you're signed in as. Choose Allow, and ChatGPT lists Deal.ai's tools.
Start a new chat and type @, then choose Deal.ai and ask. ChatGPT may ask you to confirm before a tool that changes something in your Deal.ai account, such as starting a deal check or watching a price.
Codex reads MCP servers from its config.toml (~/.codex/config.toml). Add:
[mcp_servers.deal-ai] url = "https://deal.ai/mcp"
Then sign in to Deal.ai, in the browser it opens:
codex mcp login deal-ai
codex mcp list shows it's there. Codex is handy for shopping questions while you work: ask it to check a part's price at every store, or to compare two products before you order.
Disconnect ChatGPT or Codex at any time from Connected apps on your account page. The assistant never sees your password: it gets a key to your Deal.ai account that lapses after 90 days unused.
Mention Deal.ai (or pick it with @) so ChatGPT uses it rather than a web search. Prompts below are examples to try; the answers come from Deal.ai's records at the time you ask.
“@Deal.ai compare prices for the AirPods Pro 3”
Answered by search_products and get_product_prices
Every store's current price Deal.ai has for it, cheapest first, with shipping, condition, stock, the date each price was seen and a link to buy at each store. The best price is always a store's own: marketplace sellers' listings are labelled and never called the best price. It also gives the lowest price Deal.ai has tracked and a link to the product's page on deal.ai with its full price history.
“@Deal.ai is $199 a good price for the Ninja Creami Deluxe?”
Answered by check_deal and get_deal_check
A deal check of the exact item, new, at every big US store at the same moment, usually in 20 to 70 seconds. The verdict: cheaper elsewhere (where, and by how much), as low as any store, or no store found; then each store's price with a link, and a result page on deal.ai you can share.
“@Deal.ai what are today's best Best Buy deals over 30% off?”
Answered by get_deals
Live deals at that store, biggest saving first: each one's price, the price it's measured against and what that price is (for example the usual price), the discount, when the price was last checked, and links to its deal page and the store. You can also filter by category, by search words or by a top price.
“@Deal.ai show me deals on air fryers under $100”
Answered by get_deals
Deal.ai's live deals that match the words and the price, in the order the site's search ranks them, each with its price, saving, when it was checked and its links. When nothing matches, it says so; new deals land on deal.ai every hour.
“My budget is $150. Ask Deal.ai for a birthday gift for a 10-year-old who loves science.”
Answered by ask_deal_ai and get_deal_ai_answer
Deal.ai's shopping agent researches the request in one to three minutes and ChatGPT checks back for it. You get its answer and up to six picks, each with why it was picked, its best price from a store and when that was seen, its rating and its links. A follow-up such as “something for outdoors instead” continues the same search.
“@Deal.ai what's in the box with the Kindle Paperwhite, and what do buyers complain about?”
Answered by search_products and get_product_details
The product's description, specs and rating, and a fact sheet read from a store's own product page: highlights, what's in the box, returns and shipping terms, and what buyers praise and complain about, with the store it came from and when it was read. Plus its best price from a store and a link to its page on deal.ai.