Connect GrailHound to your favorite AI assistant.
Fine-tune your trackers and check in on them using Claude, ChatGPT, Gemini or any MCP-enabled AI assistant.
Watch eBay, Depop and Grailed for vintage concert shirts under $150.
GrailHound · ran a test search
I'd track "vintage concert shirt" under $150 and leave out reprints. Here's what that would catch:
- Match Vintage 1994 Pink Floyd concert shirt, XL $85 · eBay US
- Match Vintage 1989 Rolling Stones concert shirt $120 · Depop
- Skipped Nirvana concert shirt, vintage style reprint excluded word "reprint"
Looks good. Create it.
GrailHound · tracker created
Not sure what to ask?
Check what your trackers found
- What did my trackers find today?
- Show me the five cheapest matches from this week.
- Open my newest Jordan 1 match and tell me about the seller.
- Which of my trackers finds the most listings?
Set up a new tracker
- Set up a tracker for a Leica M6 under $2,000 on eBay and Mercari. Show me what it would catch first.
- I collect Game Boy games. Help me set up a tracker for a boxed Pokémon Crystal.
- Watch Vinted and Depop for Arc'teryx Beta jackets under $250.
Fine-tune your results
- My Pokémon card tracker is full of fakes and proxies. Look at its matches and suggest filters.
- Leave out listings that say "replica" or "box only" on my Rolex tracker.
- Mark the last three matches as not wanted. They're all phone cases.
- Block the seller of my newest match. They keep relisting the same lot.
Keep your trackers running
- Which of my trackers have a marketplace that isn't working?
- Mute my camera tracker for now.
- Add Facebook Marketplace near Chicago to my Eames chair tracker.
- Send my Rolex tracker's alerts by email instead of push.
Let your assistant fine-tune your results.
Your assistant can read a tracker's matches, including the ones you marked as wanted or not, and find what the junk has in common. Then it can test a fix on the live marketplaces before anything changes.
-
Say what's wrong
Use your own words, like "too many phone cases" or "nothing over $500".
-
It reads your matches
Recent ones, plus every match you rated. Your ratings teach GrailHound what you mean.
-
It tests a fix
It picks words to leave out, a price limit, a category or an AI check, then runs a test search. You see what would match, what would be skipped and why.
-
You approve it
The new filters apply to every listing the tracker finds after that.
My Leica M6 tracker keeps showing cases and straps. Can you fix it?
GrailHound · read 40 matches
Most of the junk is accessories. I'd leave out "case", "strap" and "lens cap", and set a $2,500 limit. Here's a test search with those changes:
- Match Leica M6 Classic, black chrome, serviced $2,150 · eBay US
- Skipped Leica M6 half case, brown leather excluded word "case"
- Skipped Leica M6 TTL with 35mm Summicron over $2,500
Looks right. Save it.
GrailHound · filters saved
How to connect your assistant.
Requires a GrailHound account. MCP is available for all plans.
https://grailhound.app/mcp
Claude
- In Claude on the web or the desktop app, open Customize, then Connectors.
- Click + Add, then Add custom connector.
- Paste the address and click Continue. Keep the sign-in setting Claude suggests, click Continue again, then Add.
- Click Connect. Sign in to GrailHound and click Allow.
- In a chat, click + and open Connectors to check GrailHound is turned on.
Works on every Claude plan. The Free plan allows one custom connector. On Team and Enterprise, an owner adds it first.
ChatGPT
- In ChatGPT on the web, open Plugins.
- Click +, then Add custom MCP server.
- Name it GrailHound, paste the address and choose OAuth for authentication.
- Tick I understand and want to continue, click Create as a plugin and install it. Sign in to GrailHound and click Allow when it asks.
- Start a new chat, type @ and pick GrailHound.
OpenAI lists custom connectors for ChatGPT Business, Enterprise and Edu. On Business, an admin adds it. Pro accounts can connect but only read.
Claude Code and other apps
- Run the command below in your terminal.
- In Claude Code, type
/mcp, pick GrailHound and choose Authenticate.
claude mcp add --scope user --transport http grailhound https://grailhound.app/mcp
Connected in Claude on the web already? Claude Code has GrailHound too when you sign in with the same account. In other apps, add the address as a remote MCP server. Sign-in uses OAuth.
FAQs
01 What is MCP?
MCP, the Model Context Protocol, is an open standard for connecting AI assistants to other apps. GrailHound runs an MCP server, and Claude, ChatGPT and other assistants connect to it.
02 Do I need a GrailHound account?
Yes. A free account works, and you sign in to it when you connect.
03 Does it cost extra?
No. It works on every GrailHound plan, and test searches don't use credits.
04 Can I use it on my phone?
Yes, in Claude. Connect GrailHound on the web or in the desktop app, and it shows up in the Claude phone apps too. OpenAI says ChatGPT's custom connectors work on the web only.
05 Does my assistant ask before it changes anything?
Claude asks before each change unless you picked Always allow for that tool. ChatGPT asks you to confirm changes by default.
06 Can it buy a listing or message a seller?
No. Every match links to the listing on its marketplace, and you buy or message the seller there.
07 Does my assistant see my GrailHound password?
No. You sign in on GrailHound's own page, and the assistant gets a key that only works for this connection.
08 What does GrailHound see from my chats?
Only what each request needs, such as a keyword or a tracker's settings. The rest of the conversation stays with your assistant. We log each request for 400 days, and the privacy policy has the details.
09 How do I disconnect?
Remove GrailHound in your assistant's connector settings. Changing your GrailHound password disconnects every assistant at once.
10 What if my assistant can't connect?
Check that the address is exactly https://grailhound.app/mcp. In Claude, disconnect and connect again from Customize, then Connectors. If it still fails, email contact@grailhound.app and tell us which assistant you use.
11 Why does it ask me to verify my email?
Some requests need a verified email. Verify it in the GrailHound app, then ask again.
12 Why does a test search say to try again later?
Test searches are limited per hour and per day. The message says when you can search again.
Let GrailHound keep watch.
Free to start, no card required.