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
- 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.
Claude Code
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
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:
{
"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:
{
"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.
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:
[mcp_servers.Channel3]
url = "https://mcp.trychannel3.com/"
env_http_headers = { "X-API-Key" = "CHANNEL3_API_KEY" }