Read Sellasist orders, products, stock, customers, invoices, returns; add order notes, set status. For online sellers in Poland who manage shop and marketplace orders in Sellasist. Hosted by usefulapi — connect from Claude, ChatGPT, Cursor, or any MCP client.
Team and Enterprise: an Owner adds the connector for the organization first.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"sellasist": {
"url": "https://sellasist.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"sellasist": {
"type": "http",
"url": "https://sellasist.usefulapi.io/mcp"
}
}
}No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run these commands. The second one opens the login page:
Other MCP clients (Windsurf, Cline, Zed and more): add the URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser. Do not add an Authorization header: see Before you connect.
The AI lists recent orders by status, payment or source, such as Allegro or your shop, with the buyer, total and comment of each.
sellasist_list_orders sellasist_search_orders sellasist_list_order_statuses
The AI opens one order with its items, delivery address, payments and notes, and lists its waybills with tracking numbers.
sellasist_get_order sellasist_list_order_notes sellasist_list_waybills
The AI lists products with stock and reserved quantities, checks one product's stock by EAN or symbol, and ranks last month's bestsellers.
sellasist_list_products sellasist_get_stock sellasist_list_bestsellers
The AI finds the status id, changes the order's status and adds a note for your staff. Status automations may run; the marketplace is updated only if you ask.
Changes data · sellasist_list_order_statuses sellasist_update_order_status sellasist_add_order_note
The AI lists return documents by date, order or status and opens one with its refund, courier, tracking and returned items.
sellasist_list_returns sellasist_get_return
The AI lists invoices by order, series or issue date and opens one with its lines, VAT, total and paid amount.
sellasist_list_invoices sellasist_get_invoice
The login page asks for your Sellasist address and Sellasist API key.
In Sellasist open Integracje -> Klucze API and create a key. Your address is the one you log in at, for example mycompany.sellasist.pl. The key is used only to call your own Sellasist account on your behalf; it is never shown to anyone.
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: the login page asks for your Sellasist address and Sellasist API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Turn on the Sellasist connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
sellasist_list_orders | read | List orders List orders, newest first, with status, buyer billing address, payment, total, source (Allegro, eBay, Amazon, shop...) and comment. Filter by status, email, name, external id, payment, source or date. Use sellasist_get_order for line items and shipments. GET /orders. |
sellasist_get_order | read | Get order One order by id: status, buyer and delivery address, payment, shipment method, line items (product ids, EAN, quantities, prices), notes, waybills with tracking numbers, payments and additional fields. GET /orders/{order_id}. |
sellasist_search_orders | read | Search orders by creation date and status Find up to 100 orders created in a date range and/or in one status (id, date, status). Read-only: it uses POST only because the criteria go in the body. POST /orders_search. |
sellasist_list_order_statuses | read | List order statuses The order statuses configured in the account. Use the ids to filter orders or to change a status. GET /statuses. |
sellasist_list_order_notes | read | List order notes Notes written on one order (author id, date, text, visibility). GET /notes/{order_id}. |
sellasist_list_order_logs | read | List order change log The audit log of order actions (create, edit, status change, delete, merge, invoice and receipt actions) with date and user id. Filter by order ids, action type or date. GET /orders_logs. |
sellasist_list_waybills | read | List waybills (shipping labels) Waybills (shipping labels) with order id, tracking number, creation and delivery date. Filter by order or date. Label files are not returned inline. GET /ordersshipments. |
sellasist_list_products | read | List products List products with id, name, EAN, symbol, catalog number, location, price, promo price, stock quantity, reserved quantity and variants. Filter by category, manufacturer, EAN, symbol or catalog number. GET /products. |
sellasist_get_product | read | Get product One product by id: title, category, prices, VAT, stock, sold counts, EAN, symbol, location, weight, qualities, availability, manufacturer and more. GET /products/{product_id}. |
sellasist_get_stock | read | Get stock levels Stock quantity of one product, found by id, EAN, symbol or catalog number (the first one given in that order counts); with none of them, a page of stock levels for all products. GET /products_stock. |
sellasist_list_bestsellers | read | List bestselling products Products ranked by units sold in the last month (sold_last_month), with stock and price. GET /products_bestsellers. |
sellasist_list_categories | read | List categories Product categories. GET /categories. |
sellasist_get_category | read | Get category One category: names per language, parent category and status. GET /categories/{category_id}. |
sellasist_list_warehouses | read | List warehouses Warehouses (id, title). Needs the warehouse-management feature, otherwise Sellasist answers HTTP 406. GET /storages. |
sellasist_list_customers | read | List customers Registered customers (the account's buyers). GET /users. |
sellasist_get_customer | read | Get customer One customer: email, registration date, billing and delivery address. GET /users/{user_id}. |
sellasist_list_invoices | read | List invoices Invoices (id, number, date). Filter by order, document series or issue date. GET /invoices. |
sellasist_get_invoice | read | Get invoice One invoice: number, dates, seller, buyer, currency, line items (net, gross, VAT), total and paid amount. GET /invoices/{invoice_id}. |
sellasist_list_returns | read | List returns Return documents (RMZ): number, status, source, linked order, refund value and tracking number. Filter by date, order, status, source or return number. GET /returns. |
sellasist_get_return | read | Get return One return document with status, refund and payment details, tracking, courier and the returned items. GET /returns/{id}. |
sellasist_list_payment_methods | read | List payment methods Payment methods (id, title) for filtering orders. GET /payments. |
sellasist_list_shipment_methods | read | List delivery methods Delivery methods (id, title) for filtering orders. GET /shipments. |
sellasist_list_order_sources | read | List order sources Order sources available in the account (id, name, type: Allegro, shop, marketplace...). GET /sources. |
sellasist_list_integration_accounts | read | List connected marketplace accounts Accounts connected in external services (id, login, type). Only these three fields are returned. GET /external_accounts. |
sellasist_list_alerts | read | List system alerts Active alerts and system messages shown on the Sellasist dashboard (type, severity, title, message). GET /alerts. |
sellasist_add_order_note | write | Add order note WRITE: add a new note to an order. Notes are visible to the account's staff; each call adds another note (nothing is overwritten). POST /notes. |
sellasist_update_order_status | write | Change order status WRITE: change the status of one order (PUT /orders/{order_id} with only the status). Sellasist may run the status's automations (emails, stock moves). By default the new status is NOT pushed to the marketplace; set send_status_to_external to true to push it. Find status ids with sellasist_list_order_statuses. |
sellasist_usage_status | Usage status (free-tier meter) Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter. | |
sellasist_request_feature | Request a missing feature Tell usefulapi that the user needs something the Sellasist tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. | |
sellasist_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on Sellasist (the free tier caps monthly usage). Plans: "monthly" — $9/month; "yearly" — $90/year (2 months free). Cancel any time: Pro then runs to the end of the paid period, so it also suits a one-time job. *A fair use limit applies. For heavy use (near Pro's limit): "plus" or "plus_yearly" — Pro+, $39/month or $390/year, unlimited tool calls (fair use limit: 100,000 a month); an existing Pro subscription changes to Pro+ in place (needs confirm: true; the price difference for the rest of the period is charged at once). Otherwise returns a short link to open in your browser (it opens Stripe Checkout); after payment the account upgrades automatically. Does not count against the meter. | |
sellasist_cancel_subscription | Cancel the Pro subscription Cancel the caller's Sellasist Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run sellasist_upgrade later to undo the cancel before the period ends. Does not count against the meter. |
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper account | $9/mo · $90/yr | Unlimited* |
*Pro fair use limit: 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this Sellasist server only. Subscribe with sellasist_upgrade (it returns a Stripe Checkout link). Cancel any time with sellasist_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running sellasist_upgrade before then undoes the cancel. Or write to [email protected].
Find orders that need attention. Check an order before shipping. Spot low stock and bestsellers. Change an order's status and add a note. Review returns and refunds. Look up invoices. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Sellasist. The server calls the Sellasist API with your own Sellasist access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Sellasist address and Sellasist API key. See Before you connect for where to find them.
No. 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: the login page asks for your Sellasist address and Sellasist API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Sellasist API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Sellasist.
Yes, if you approve it. 2 of the 27 Sellasist tools can create or change data. The other 25 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with unlimited tool calls (fair use limit: 10,000 tool calls a month), for this Sellasist server only. Cancel any time: Pro then runs to the end of the paid period. Run sellasist_usage_status to see how many calls you used.
Ask the AI to run sellasist_upgrade: it returns a Stripe Checkout link. To cancel, run sellasist_cancel_subscription. Pro continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with sellasist_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.