Billigast

Billigast

Prisjakt and PriceRunner rarely agree, so I made one MCP server that asks both.

This morning I checked AirPods Pro 2. Prisjakt's lowest was 2 755 kr. PriceRunner had OnBuy at 2 530 kr, and Refurbed had a refurbished pair for 1 765 kr. Prisjakt's history also showed them at 1 670 kr in the middle of October, so I'm waiting. Same store, different numbers: CDON listed a Dyson V15 at 8 763 kr on Prisjakt and 8 122 kr on PriceRunner at the same moment.

It's read-only. No accounts, no alerts, nothing stored.

[License: MIT] [MCP]

Tools

search looks up a product on both sites at once and folds the two listings into one result when they're the same thing. That part is stricter than you'd think. An iPhone 16 128 GB never gets merged with the 256 GB one, Pro stays apart from Pro Max, and AirPods with Lightning aren't the USB-C pair. PriceRunner splits colours into separate products, Prisjakt mostly doesn't, so a colour only has to match when both name one. When the server isn't sure, it keeps two results rather than guessing. Each result shows both sites' lowest price and store count, and which one is cheaper.

compare gives every store's price for one product, from both sites, cheapest first. Hand it a key from search, a Prisjakt or PriceRunner link, or just a name like "playstation 5 slim". With a link from one site it finds the same product on the other by itself. A store listed on both becomes one row with both prices. Sold-out rows go to the bottom and never count as the cheapest, because they often carry an old price. You get the cheapest new offer, the cheapest that's in stock, and the cheapest used or refurbished one even when you only asked for new. Prisjakt's price history comes along with a plain sentence on where today's price sits, like "8 990 kr today is 16% above the 90-day low of 7 749 kr on 2026-08-20."

In ChatGPT both tools also show a small card view, and tapping a product opens its store list.

On your own computer

Claude Desktop, Claude Code, Cursor and Codex can run the server locally over stdio. No token, no hosting.

For Claude Desktop, download billigast-mcp-<version>.mcpb from Releases and double-click it.

Other clients can start it with Docker. In Claude Code:

claude mcp add billigast -- docker run -i --rm ghcr.io/idoo/billigast-mcp

Cursor and Codex take the same command and args in their MCP config. Without Docker, build it with Node 20 or newer:

npm ci && npm run build:stdionode dist/billigast-mcp.js

Hosted, for ChatGPT and claude.ai

ChatGPT and claude.ai can't reach your laptop, so they need a public HTTPS address. I run mine as a Cloudflare Worker, and the free plan is plenty.

ChatGPT's custom connectors offer OAuth or no auth at all. For public prices OAuth seemed like too much, so the endpoint sits behind a secret path, /mcp/<token>, and everything else gets a 404. Make up a long random token:

openssl rand -hex 24

Then deploy:

git clone https://github.com/idoo/billigast-mcp && cd billigast-mcpnpm cinpx wrangler loginnpx wrangler deploynpx wrangler secret put MCP_PATH_TOKEN    # paste the token

Wrangler prints a workers.dev URL. Add /mcp/<token> to it. wrangler.jsonc caps it at 120 calls a minute.

For local dev put MCP_PATH_TOKEN=dev in .dev.vars, run npm run dev and use http://localhost:8787/mcp/dev.

Connect

ChatGPT on the web: Plugins, Add, "Add custom MCP server". Paste the endpoint, pick no authentication. After that, @Billigast in any chat. Both tools are marked read-only, so ChatGPT doesn't ask before each call.

claude.ai: Settings → Connectors → Add custom connector.

Claude Code and Codex:

claude mcp add --transport http billigast https://…/mcp/<token>codex mcp add billigast --url https://…/mcp/<token>

How it works

Neither site has a public API. The server calls the same JSON endpoints their own pages use, a handful of requests per tool call, only when you ask. It doesn't touch the paths their robots.txt rules out: no HTML search pages, no shop redirects, and no PriceRunner price history. The store links you get are the sites' own, so they still get credit when you buy. If either site changes its endpoints, that half stops working until someone fixes it, and the other half keeps answering. PRs welcome.

Not affiliated with Prisjakt or PriceRunner.

License

MIT