Channel3 Shopping

com.trychannel3Published by trychannel3.comOfficial publisherv4.0.0Updated Oct 24, 2026

Shopping search across 100M+ products, with every retailer's offer and live price in one place.

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingBusiness & Commerce

Overview

AI-generated overview

Searches 100M+ products across thousands of retailers and returns each retailer's offers and live prices, with an optional interactive storefront UI.

What you can do
  • Search products by type and constraints, returning up to 8 product cards with structured data
  • Fetch full product details (offers, description, attributes, images) by product ID or retailer URL, several at once for comparison
  • Browse and page through products, and find similar products
  • Fetch 30-day price history for a product
  • Render results in an interactive storefront UI on hosts that support MCP Apps
  • Watch a product variant for price and stock alerts when the server has alerting enabled
When to use it
Useful when you want an assistant to research purchases, compare offers and prices across retailers, check price history, or find alternatives and duplicates while shopping.
Requirements
A remote Streamable HTTP endpoint; no local runtime, API key or OAuth is required for the rate-limited free tier. An X-API-Key header, created from an account dashboard, lifts the rate limit and attributes affiliate clicks. Some clients (such as ChatGPT developer-mode apps) accept no auth or OAuth only, so the header cannot be sent there.
Before you install
The optional X-API-Key is a secret; keep it out of config files where possible and note that it also attributes affiliate clicks to your account. Product searches and product identifiers are sent to the third-party service. Watch tools subscribe a conversation to price and stock alerts and create subscriptions on the server's own account; without sign-in, each watch belongs to the conversation that made it.

Installation

In SourceWeft

  1. Open Channel3 Shopping in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.trychannel3%2Fshopping/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "channel3-shopping": {
      "type": "http",
      "url": "https://mcp.trychannel3.com/"
    }
  }
}

README

Channel3 Shopping

Shopping search across 100M+ products, with every retailer's offer and live price in one place — an MCP server with an interactive storefront UI on hosts that support it.

https://github.com/user-attachments/assets/59508319-aa1f-4462-afbe-52b64638ece3

  • Transport: Streamable HTTP (protocol revision 2026-07-28, stateless)
  • Endpoint: https://mcp.trychannel3.com/
  • Tools: search_products, get_products, plus watch_product and unwatch_product when price and stock alerts are enabled
  • Prompts: find-gift, price-check, find-dupes
  • UI: results render in an interactive storefront (MCP Apps) on hosts that support it

Connect

One URL, no API key and no OAuth:

https://mcp.trychannel3.com/

Limits on the free tier are generous and sized for personal use. For unlimited usage and affiliate attribution, add an API key.

[Install in Cursor] [Install in VS Code]

Claude Code

bash
claude mcp add --transport http --scope user Channel3 https://mcp.trychannel3.com/

Claude web, Desktop, and mobile

Settings → Connectors → Add custom connector, then paste the endpoint URL. Claude connects from its own servers, so one connector covers every Claude surface including mobile.

Don't use claude_desktop_config.json for this: it only accepts stdio servers, and an entry with a url field is silently dropped along with the rest of mcpServers.

ChatGPT

Turn on developer mode under Settings → Security and login, then create an app under Settings → Plugins pointing at the endpoint URL, with authentication set to none.

Codex

bash
codex mcp add Channel3 --url https://mcp.trychannel3.com/

Cursor and VS Code by hand

~/.cursor/mcp.json, or .cursor/mcp.json to scope it to one project:

json
{  "mcpServers": {    "Channel3": {      "url": "https://mcp.trychannel3.com/"    }  }}

.vscode/mcp.json, or code --add-mcp '{"name":"Channel3","type":"http","url":"https://mcp.trychannel3.com/"}' for the user profile:

json
{  "servers": {    "Channel3": {      "type": "http",      "url": "https://mcp.trychannel3.com/"    }  }}

Any other client

Register the endpoint as a Streamable HTTP server; there is no SSE endpoint. It's stateless, so there's no session to keep alive, and clients on the 2026-07-28 revision can skip the initialize handshake entirely.

Price and Stock Alerts

watch_product subscribes a conversation to one variant's price and availability changes, including retailers starting or stopping selling it. A product with options needs a value for every option in selected_options, and the error lists any that are missing. When Channel3 detects a change, the conversation is woken through Wakeshift, even after it has gone idle.

How it fits together:

  1. watch_product creates a Channel3 product subscription on this server's own account, then subscribes the conversation to the matching Wakeshift events (product.price.changed, product.availability.changed).
  2. Channel3 posts signed webhooks to POST /webhooks/channel3. The server verifies the Standard Webhooks signature and emits the occurrence to Wakeshift, using the Channel3 event ID for deduplication.
  3. When an event reaches no watchers, the server cancels its Channel3 subscription, once that subscription is over an hour old.

There's no sign-in, so each watch belongs to the conversation that made it. watch_product returns a watch_id, every alert repeats it, and unwatch_product takes it.

Setup:

bash
wrangler secret put WAKESHIFT_KEY            # wst_… app key from the Wakeshift consolewrangler secret put CHANNEL3_WEBHOOK_SECRET  # whsec_… signing secret of the endpoint below

Waking uses @wakeshift/sdk, which needs @modelcontextprotocol/server 2.3 or later: on 2.0 to 2.2, Claude Code's background wait fails with Method not found and the conversation is never woken.

Add https://mcp.trychannel3.com/webhooks/channel3 as an endpoint in the Channel3 webhook dashboard of the account that owns DEFAULT_CHANNEL3_API_KEY, subscribed to offer.price.changed, offer.availability.changed, offer.created and offer.deleted. Without WAKESHIFT_KEY the watch tools aren't registered, and without both secrets the webhook route returns 404.

Free Tier and API Keys

Create an account at trychannel3.com, copy a key from the dashboard, and send it as an X-API-Key header. That lifts the free-tier rate limit and attributes affiliate clicks to your account.

  • Cursor / VS Code: add "headers": { "X-API-Key": "<your-api-key>" } alongside url.
  • Claude Code: append --header "X-API-Key: <your-api-key>" to the claude mcp add command.
  • Claude connectors: enter the key under Request headers in the Add custom connector dialog. That section is a beta still rolling out.
  • ChatGPT: developer-mode apps accept OAuth or no auth only, so there's no header field.
  • OpenAI hosted MCP (Responses API mcp tool, HostedMCPTool): put the key in the tool's authorization field — the server accepts it as a bearer token.
  • Codex: map the header to an env var in ~/.codex/config.toml so the key stays out of the file:
toml
[mcp_servers.Channel3]url = "https://mcp.trychannel3.com/"env_http_headers = { "X-API-Key" = "CHANNEL3_API_KEY" }

Source: README.md at commit c95548c

Tools

6

search_products

Search Products

Search 100M+ products across thousands of retailers for one product type. Call once for each distinct product type, and send independent calls together. Put relevant constraints in `query`. Returns up to 8 product cards plus structured product data. The result includes a `thread_id`. You MUST include it unchanged as the `thread_id` parameter on every subsequent Channel3 tool call in this conversation — including searches for new, unrelated products. Never omit it once you have one.

Parametersqueryimage_urlthread_id

get_products

Get Products

Get full product data (offers, description, attributes, images) by product ID from a search result, or by retailer URL. Pass several IDs in one call to compare. Use search_products to find products. Returns details in the storefront UI. The result includes a `thread_id`. You MUST include it unchanged as the `thread_id` parameter on every subsequent Channel3 tool call in this conversation — including searches for new, unrelated products. Never omit it once you have one.

Parametersthread_idproduct_idsrequired

browse_products

Browse Products

Search and page through products for the storefront UI.

Parameterslimitquerydevice_idimage_urlthread_idpage_token

get_similar

Get Similar Products

Find products similar to a given product, for the storefront UI.

Parameterslimitdevice_idthread_idproduct_idrequired

get_details

Get Product Details

Fetch a product with live offers, for the storefront UI.

Parametersdevice_idthread_idproduct_idrequiredselected_options

get_price_history

Get Price History

Fetch 30-day price history for a product, for the storefront UI.

Parametersdevice_idthread_idproduct_idrequiredselected_options

Version history

1
  1. v4.0.0LatestSep 16, 2026

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