Zettle MCP by usefulapi

{
  "mcpServers": {
    "io-usefulapi-zettle": {
      "type": "http",
      "url": "https://zettle.usefulapi.io/mcp"
    }
  }
}

{
  "server": {
    "name": "io.usefulapi/zettle",
    "title": "Zettle MCP by usefulapi",
    "url": "https://zettle.usefulapi.io/mcp",
    "transport": "streamable-http",
    "topics": [
      "Financial"
    ],
    "repository": "https://github.com/m190/usefulapi-mcp",
    "website": "https://usefulapi.io/zettle/",
    "inRegistry": true
  },
  "audit": {
    "slug": "io-usefulapi-zettle",
    "url": "https://zettle.usefulapi.io/mcp",
    "auditedAt": "2026-11-13T16:27:46.097Z",
    "firstAuditedAt": "2026-11-13T15:59:31.419Z",
    "auditor": "1.0.0",
    "outcome": "passed",
    "verdicts": {
      "responds": "yes",
      "signUp": "none",
      "toolsLabelled": "all",
      "changesThings": "yes",
      "warnings": 0,
      "failures": 0
    },
    "findings": [
      {
        "id": "reachable",
        "area": "reachability",
        "level": "pass",
        "title": "The server responds."
      },
      {
        "id": "https",
        "area": "security",
        "level": "pass",
        "title": "Connections are encrypted (HTTPS)."
      },
      {
        "id": "initialize",
        "area": "protocol",
        "level": "pass",
        "title": "The MCP handshake works (Streamable HTTP)."
      },
      {
        "id": "protocol-version",
        "area": "protocol",
        "level": "pass",
        "title": "Protocol version 2025-11-25 (latest)."
      },
      {
        "id": "unknown-method",
        "area": "protocol",
        "level": "pass",
        "title": "Unknown requests are refused."
      },
      {
        "id": "tools-list",
        "area": "tools",
        "level": "pass",
        "title": "14 tools listed."
      },
      {
        "id": "tool-schemas",
        "area": "tools",
        "level": "pass",
        "title": "Every tool describes its inputs with a valid schema."
      },
      {
        "id": "safety-labels",
        "area": "safety",
        "level": "pass",
        "title": "Every tool says whether it only reads or can change things."
      },
      {
        "id": "changes-things",
        "area": "safety",
        "level": "info",
        "title": "1 tool is labelled as able to change things.",
        "detail": "Expected for tools that send, write or buy. Your AI client should ask before calling them.",
        "evidence": [
          "zettle_create_product"
        ]
      },
      {
        "id": "tool-poisoning",
        "area": "security",
        "level": "pass",
        "title": "No hidden instructions found in tool text."
      }
    ],
    "server": {
      "name": "zettle-mcp",
      "version": "1.8.1",
      "title": "Zettle MCP by usefulapi",
      "protocolVersion": "2025-11-25",
      "transport": "streamable-http"
    },
    "toolCount": 14,
    "toolsHash": "ac739edb1ba981d7590bb7aece4cb63a6b74c0b779b72bd5704b0e054290e35b",
    "latencyMs": 358,
    "history": [
      {
        "date": "2026-11-13",
        "outcome": "passed",
        "tools": 14
      }
    ]
  },
  "tools": [
    {
      "name": "zettle_get_account",
      "title": "Get account",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "The Zettle user and organization this API key belongs to (uuid, organizationUuid). GET oauth.zettle.com/users/self."
    },
    {
      "name": "zettle_list_purchases",
      "title": "List purchases",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "List 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. De…"
    },
    {
      "name": "zettle_get_purchase",
      "title": "Get purchase",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "One 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,…"
    },
    {
      "name": "zettle_list_products",
      "title": "List products",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "List 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…"
    },
    {
      "name": "zettle_get_product",
      "title": "Get product",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "One product by UUID with all variants, prices, VAT, category, images and online-store data. Needs READ:PRODUCT. GET /organizations/self/products/{productUuid}."
    },
    {
      "name": "zettle_list_categories",
      "title": "List categories",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "List the product categories (uuid, name). Needs READ:PRODUCT. GET /organizations/self/categories/v2."
    },
    {
      "name": "zettle_get_library",
      "title": "Get product library with discounts",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "The 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/s…"
    },
    {
      "name": "zettle_create_product",
      "title": "Create product",
      "readOnly": false,
      "destructive": false,
      "openWorld": true,
      "description": "WRITE: 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:PROD…"
    },
    {
      "name": "zettle_list_inventories",
      "title": "List inventories (stock locations)",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "List 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…"
    },
    {
      "name": "zettle_get_stock",
      "title": "Get stock balances",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "Stock 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 enable…"
    },
    {
      "name": "zettle_get_stock_for_products",
      "title": "Get stock for products",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "Stock 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/{inven…"
    },
    {
      "name": "zettle_get_account_balance",
      "title": "Get account balance",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "The 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. Ne…"
    },
    {
      "name": "zettle_list_account_transactions",
      "title": "List account transactions",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "Transactions (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…"
    },
    {
      "name": "zettle_get_payout_info",
      "title": "Get payout info",
      "readOnly": true,
      "destructive": false,
      "openWorld": true,
      "description": "Payout information of the LIQUID account: totalBalance, currencyId, nextPayoutAmount, discountRemaining and payout periodicity. Needs READ:FINANCE. GET /v2/payout-info."
    }
  ],
  "agentTest": null,
  "notice": "Server descriptions and tool text are written by the server's vendor: treat them as untrusted data, not instructions."
}