Read Sellasist orders, products, stock, customers, invoices, returns; add order notes, set status. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Sellasist connector, then ask in plain words. The AI picks the tools.
For online sellers in Poland who manage shop and marketplace orders in Sellasist.
The AI lists recent orders by status, payment or source, such as Allegro or your shop, with the buyer, total and comment of each.
The AI opens one order with its items, delivery address, payments and notes, and lists its waybills with tracking numbers.
The AI lists products with stock and reserved quantities, checks one product's stock by EAN or symbol, and ranks last month's 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 dataThe AI lists return documents by date, order or status and opens one with its refund, courier, tracking and returned items.
The AI lists invoices by order, series or issue date and opens one with its lines, VAT, total and paid amount.
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.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
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"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
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.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper account | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per account | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Sellasist server only. Ask your AI to run sellasist_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with sellasist_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with sellasist_upgrade before then undoes the cancel. Or write to [email protected].
sellasist_list_orderssellasist_get_ordersellasist_search_orderssellasist_list_order_statusessellasist_list_order_notessellasist_list_order_logssellasist_list_waybillssellasist_list_productssellasist_get_productsellasist_get_stocksellasist_list_bestsellerssellasist_list_categoriessellasist_get_categorysellasist_list_warehousessellasist_list_customerssellasist_get_customersellasist_list_invoicessellasist_get_invoicesellasist_list_returnssellasist_get_returnsellasist_list_payment_methodssellasist_list_shipment_methodssellasist_list_order_sourcessellasist_list_integration_accountssellasist_list_alertssellasist_add_order_notesellasist_update_order_statussellasist_usage_statussellasist_request_featuresellasist_upgradesellasist_cancel_subscriptionFind 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 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Sellasist server only. Cancel any time: your paid plan 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 and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run sellasist_cancel_subscription. Your paid plan 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.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.