Read invoices, orders, products and stock; add customers and suppliers in Silvasoft. For Dutch small businesses and bookkeepers that keep their books and invoices in Silvasoft. 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": {
"silvasoft": {
"url": "https://silvasoft.usefulapi.io/mcp"
}
}
}Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"silvasoft": {
"type": "http",
"url": "https://silvasoft.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.
List sales invoices by date, or only the outstanding ones. Add the invoice lines to see the items on each invoice.
silvasoft_list_sales_invoices
Find a product by article number or EAN. Read its price, VAT and stock quantity.
silvasoft_list_products
List sales orders by order date or status. List purchase invoices by number or date.
silvasoft_list_orders silvasoft_list_purchase_transactions
List customers and suppliers with their contact and address details. Filter, page and sort the list.
silvasoft_list_relations
Create a business customer or supplier. If one with the same e-mail, name or number exists, Silvasoft returns it and creates nothing.
Changes data · silvasoft_add_business_relation
The login page asks for your Silvasoft login e-mail and Silvasoft API key.
Get the API key from your Silvasoft dashboard. The API module must be enabled on your account, and Silvasoft shows the key only once, when it is created. The key is used only to call the API on your behalf and to derive a private account id; 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 Silvasoft login e-mail and Silvasoft 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 Silvasoft connector, then ask in plain words. The AI picks the tools.
| Tool | Type | What it does |
|---|---|---|
silvasoft_list_relations | read | List relations List customers and suppliers (relations) with contact and address details. Returns at most 200 per call; use Offset with a stable Sorting to page. Silvasoft API: GET listrelations/. |
silvasoft_list_products | read | List products List products (articles) with price, VAT and stock quantity. Use ArticleNumber or EAN for one exact product. Silvasoft API: GET listproducts. |
silvasoft_list_orders | read | List sales orders List sales orders, filtered by order date, change or creation time, or custom status. Silvasoft API: GET listorders/. |
silvasoft_list_sales_invoices | read | List sales invoices List sales invoices, with optional invoice lines. Use InvoiceNumber for one invoice, or dates and OutstandingOnly to filter. Lines return at most 50 invoices per call. Silvasoft API: GET listsalesinvoices/. |
silvasoft_list_purchase_transactions | read | List purchase invoices List purchase invoices (supplier invoices) by number or date. Silvasoft API: GET listpurchasetransactions/. |
silvasoft_list_tax_codes | read | List tax codes List the tax codes configured in the administration, with their rate. Silvasoft API: GET listtaxcodes/. |
silvasoft_list_ledger_accounts | read | List ledger accounts List ledger accounts (grootboekrekeningen) for a fiscal year. Without FiscalYear, returns the latest year. Silvasoft API: GET listledgeraccounts/. |
silvasoft_list_day_registrations | read | List time registrations List day registrations (hours worked per user and day) for a date range. Silvasoft API: GET listdayregistrations/. |
silvasoft_add_business_relation | write | Add a business relation Create a business customer or supplier. If a relation with the same e-mail, name or number exists, Silvasoft returns that relation and creates nothing. Silvasoft API: POST addbusinessrelation/. |
silvasoft_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. | |
silvasoft_request_feature | Request a missing feature Tell usefulapi that the user needs something the Silvasoft 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. | |
silvasoft_upgrade | Upgrade to Pro (unlimited*) Get Pro: unlimited tool calls (fair use limit: 10,000 a month) on Silvasoft (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. | |
silvasoft_cancel_subscription | Cancel the Pro subscription Cancel the caller's Silvasoft 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 silvasoft_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 user | $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 Silvasoft server only. Subscribe with silvasoft_upgrade (it returns a Stripe Checkout link). Cancel any time with silvasoft_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running silvasoft_upgrade before then undoes the cancel. Or write to [email protected].
List outstanding sales invoices. Check the price and stock of a product. Review sales orders and purchase invoices. Look up customers and suppliers. Add a new customer or supplier. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Silvasoft. The server calls the Silvasoft API with your own Silvasoft 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 Silvasoft login e-mail and Silvasoft 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 Silvasoft login e-mail and Silvasoft 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 Silvasoft 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 Silvasoft.
Yes, if you approve it. 1 of the 9 Silvasoft tools can create or change data. The other 8 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 Silvasoft server only. Cancel any time: Pro then runs to the end of the paid period. Run silvasoft_usage_status to see how many calls you used.
Ask the AI to run silvasoft_upgrade: it returns a Stripe Checkout link. To cancel, run silvasoft_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 silvasoft_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.