Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Description from the maker (original English)
Read sales, products, stock, balance and payouts; create products in Zettle.
These three are never merged into one score: opinions, measurements and popularity are different things.
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
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Works in Claude on the web, desktop and mobile:
https://zettle.usefulapi.io/mcpRun this in your terminal
claude mcp add --transport http zettle https://zettle.usefulapi.io/mcpPaste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"zettle": {
"url": "https://zettle.usefulapi.io/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Paste into .vscode/mcp.json in your project
{
"servers": {
"zettle": {
"type": "http",
"url": "https://zettle.usefulapi.io/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
https://zettle.usefulapi.io/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
zettle_get_accountThe Zettle user and organization this API key belongs to (uuid, organizationUuid). GET oauth.zettle.com/users/self.
zettle_list_purchasesList POS purchases (sales and refunds) with amount, currency, timestamp, products, discounts, payments, refund info and the cashier. Needs READ:PURCHASE. Amounts are in the smallest currency unit. Default window is the last 3 years. Page with next_page_hash (pass it back as last_
zettle_get_purchaseOne purchase (sale or refund) in full by its purchase UUID (the purchaseUUID1 field of zettle_list_purchases; the older short purchaseUUID is deprecated and not accepted): line items, VAT, payments, refund links. Needs READ:PURCHASE. GET /purchase/v2/{purchaseUuid}.
zettle_list_productsList the products in the POS product library with variants (SKU, barcode, price, cost price, VAT), category, online status and ETag. Zettle returns the whole library at once; this tool slices it with limit/offset and filters by name. Needs READ:PRODUCT. Prices are in the smallest
zettle_get_productOne product by UUID with all variants, prices, VAT, category, images and online-store data. Needs READ:PRODUCT. GET /organizations/self/products/{productUuid}.
zettle_list_categoriesList the product categories (uuid, name). Needs READ:PRODUCT. GET /organizations/self/categories/v2.
zettle_get_libraryThe product library together with its discounts (name, amount or percentage), paginated. Returns products, discounts and next_offset (pass it back as offset). Needs READ:PRODUCT. GET /organizations/self/library.
zettle_create_productWRITE: add a new product to the Zettle product library (it appears in the POS and, if enabled, the online store). Not idempotent: calling twice creates two products. Needs READ:PRODUCT and WRITE:PRODUCT. vat_percentage must be one of the VAT rates enabled in the merchant's Zettle
zettle_list_inventoriesList the stock locations (inventories): inventoryUuid, name, type (STORE, SOLD, SUPPLIER, BIN) and which is the default. Use the STORE inventoryUuid with zettle_get_stock. Needs READ:PRODUCT. GET /v3/inventories.
zettle_get_stockStock balances per product variant (balance, low-stock level and alert, last update). With inventory_uuid: that STORE inventory only; without: all stores. Only products with inventory tracking enabled appear. Needs READ:PRODUCT. Page with next_cursor. GET /v3/stock or /v3/stock/{
zettle_get_stock_for_productsStock balances of a few specific products in one inventory (read-only lookup, nothing is changed). Needs READ:PRODUCT. Page with next_cursor (send the same product_uuids again). POST /v3/stock/{inventoryUuid}/products with the product UUIDs.
zettle_get_account_balanceThe merchant's Zettle account balance (totalBalance in the smallest currency unit, currencyId). LIQUID = money available for payout; PRELIMINARY = payments not yet settled. Optional point in time. Needs READ:FINANCE. GET /v2/accounts/{LIQUID|PRELIMINARY}/balance.
zettle_list_account_transactionsTransactions (payments, fees, payouts, adjustments) in the LIQUID or PRELIMINARY account between start and end (end exclusive), with timestamp, amount (smallest currency unit, can be negative), type and originating transaction UUID. Needs READ:FINANCE. Page with next_offset. GET
zettle_get_payout_infoPayout information of the LIQUID account: totalBalance, currencyId, nextPayoutAmount, discountRemaining and payout periodicity. Needs READ:FINANCE. GET /v2/payout-info.
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
The registry name was verified against the domain usefulapi.io (the registry checks domain ownership)
We have not read this repo from GitHub yet
We have not read this repo from GitHub yet
Responded in 104 ms (HTTP 200)
No sign-in needed
Read 14 tool descriptions and found no hidden instructions to the AI
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
The registry does not list a required key, though some servers ask you to sign in on first use.
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
The GitHub repo last changed –, and the latest version (1.4.3) reached the registry yesterday.
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
In the same category: Spec Driven Development, Remote Desktop Commander, debuff
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Use your Zettle account from Claude, Cursor, or any MCP client. Read sales, refunds, products, stock, balance and payouts, and create products. Hosted, no local install: connect with your own credentials.
Live endpoint: https://zettle.usefulapi.io/mcp · Homepage: https://usefulapi.io
https://zettle.usefulapi.io/mcp.claude mcp add --transport http zettle https://zettle.usefulapi.io/mcp, then run /mcp to log in.{
"mcpServers": { "zettle": { "url": "https://zettle.usefulapi.io/mcp" } } }
Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and you sign in with your Zettle account.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/zettle/
On first connect you sign in to Zettle and approve access. Only the Zettle account owner can approve it. You can disconnect it any time in Zettle. No keys go in config files.
| Tool | Type | What it does |
|---|---|---|
zettle_get_account | read | Get account |
zettle_list_purchases | read | List purchases |
zettle_get_purchase | read | Get purchase |
zettle_list_products | read | List products |
zettle_get_product | read | Get product |
zettle_list_categories | read | List categories |
zettle_get_library | read | Get product library with discounts |
zettle_create_product | write | Create product |
zettle_list_inventories | read | List inventories (stock locations) |
zettle_get_stock | read | Get stock balances |
zettle_get_stock_for_products | read | Get stock for products |
zettle_get_account_balance | read | Get account balance |
zettle_list_account_transactions | read | List account transactions |
zettle_get_payout_info | read | Get payout info |
zettle_usage_status | meta | Usage status (free-tier meter) |
zettle_request_feature | meta | Request a missing feature |
zettle_upgrade | meta | Upgrade to Pro or Pro+ |
zettle_cancel_subscription | meta | Cancel the Pro subscription |
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro (per user) | $9/mo or $90/yr (2 months free) | Unlimited* |
\*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to support@usefulapi.io.
Pro covers this server only. Subscribe with zettle_upgrade (it returns a Stripe Checkout link). Cancel any time with zettle_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running zettle_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
MIT — see LICENSE. Documentation only; the server is hosted.