The MCP app

A tool your assistant reaches for on its own.

MCP is the open standard AI assistants use to plug in external tools. PriceLayer offers three — each on its own endpoint, so a directory listing says clearly what it does.

What is MCP?

Model Context Protocol, briefly.

On its own an assistant can only do what its training data holds. MCP gives it tools: clearly described functions it calls when the question calls for it. It decides when — you do not have to command it.

PriceLayer is authless: no account, no token, no sign-up. Enter the endpoint and you are done.

Install

Claude, ChatGPT & other assistants

The normal route. In your app's settings under “Connectors”, create a custom connector and enter this URL — that is all, the endpoint is authless. Where exactly that setting lives, and what it is called, differs by app and version.

https://mcp.pricelayer.net/shopping

Claude Code (terminal)

For the terminal client only. Other assistants do not know this command — there the route is the connector settings above.

claude mcp add --transport http pricelayer-shopping https://mcp.pricelayer.net/shopping

With --scope user the endpoint applies across all projects. Afterwards /mcp shows the connection status.

Step by step

Menu labels differ slightly by app and version. You are always looking for the same place: adding your own connectors or MCP servers.

Claude (claude.ai & desktop app)

  1. 1

    Open Settings and go to the “Connectors” section.

  2. 2

    Choose “Add custom connector”.

  3. 3

    Paste the endpoint URL. Leave any token or credential fields empty — the endpoint is authless.

  4. 4

    Confirm. The connector then appears in the list.

  5. 5

    In a chat, enable the connector if it is not on already. Then just ask for a price as you normally would.

Endpoint
https://mcp.pricelayer.net/shopping

ChatGPT

  1. 1

    Open Settings and go to the “Connectors” section.

  2. 2

    Add a custom MCP connector. Depending on your plan the option sits under advanced settings.

  3. 3

    Paste the endpoint URL and choose “none” for authentication.

  4. 4

    Save, then enable the connector in a chat.

Endpoint
https://mcp.pricelayer.net/shopping

Whether custom MCP connectors are available in ChatGPT depends on your plan. If the option is missing, that is not the endpoint's doing.

Claude Code

  1. 1

    Run the command in your terminal — inside a project, or with --scope user to apply it everywhere.

  2. 2

    Check with /mcp inside a session that the server is connected.

claude mcp add --transport http pricelayer-shopping https://mcp.pricelayer.net/shopping

Did it work?

Ask your assistant: “Check the price of B0FCMHJBMW”. If you get a price with a timestamp and a purchase link, you are set. If you get a bare number with no timestamp, the tool is not being used yet.

Your own clients

Any client that speaks Streamable HTTP can use the endpoint directly. A GET on the URL returns the full self-description as JSON — parameters, an example request and the response format.

https://mcp.pricelayer.net/shopping

The three apps

Separate endpoints rather than one catch-all tool, so the model knows exactly what each app is for.

Check Amazon prices

Main feature

Confirms Amazon ASINs and returns the current price, the title and a working purchase link. ASINs it cannot confirm are named, so the assistant does not pass them off as real.

Endpoint
https://mcp.pricelayer.net/shopping
Toolverify_amazon_pricesParameters
asins*max_price
Example questions
  • „Check the price of B0FCMHJBMW“
  • „What does ASIN B0DFH51JRW cost right now?“
  • „Is B07VPVFJDD still available?“

Common questions

Does it cost anything?
No. The service is free to use and needs no account. It is funded by affiliate links: if someone clicks a purchase link and buys, we receive a commission. Your price does not change because of it.
What data is stored?
None about you. There are no accounts and no sessions. We count anonymously how often an outgoing link was clicked, with no personal reference. Details in the privacy policy.
Where do the prices come from?
Amazon prices are checked fresh per request, not held in stock. Every answer carries the moment the price was read. The price on the product page at the time of purchase is always the binding one.
What happens if the source fails?
Then the tool says exactly that, and quotes no price. A guessed price would be worse than none at all.
Do I have to mention the tool?
No. The assistant is given a description of when the tool is useful and calls it by itself. You ask as you always would.

Status

Current state of the service, machine-readable:

https://mcp.pricelayer.net/healthz