Sellsy MCP by usefulapi MCP Server

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answering

Sellsy MCP by usefulapi is answering right now. Last checked 2 min ago. It exposes 44 tools. Last commit 1 Nov 2026.

Search and read Sellsy companies, contacts, opportunities, invoices and tasks; create records.

Uptime history 7 days of history · worst day 99%

7 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

167 ms

Response time

average over 24h

Stars

last commit 1 Nov 2026

What changed 11

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 27 October 2026. No other catalogue keeps this.

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

29 Oct a tool changed version2 times that day

28 Oct a tool changed version2 times that day

27 Oct a tool changed version

and 6 more, back to 27 October 2026

Sellsy MCP by usefulapi missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sellsy --transport http https://sellsy.usefulapi.io/mcp

Settings → Connectors → Add custom connector, then paste this address

https://sellsy.usefulapi.io/mcp

~/.codex/config.toml

[mcp_servers.sellsy]
url = "https://sellsy.usefulapi.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "sellsy": {
      "url": "https://sellsy.usefulapi.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "sellsy": {
      "type": "http",
      "url": "https://sellsy.usefulapi.io/mcp"
    }
  }
}

Available tools 44

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

sellsy

sellsy_create_comment

WRITE: add a comment (note) to a company, individual, contact, opportunity or document. Visible to the Sellsy staff, not sent to the customer. Needs comments.write.

sellsy_create_company

WRITE: create a company record in Sellsy (a prospect, client or supplier). Needs companies.write. Nothing is sent to the company.

sellsy_create_contact

WRITE: create a contact (a person) in Sellsy. It is not linked to a company by this call. Needs contacts.write.

sellsy_create_individual

WRITE: create an individual (a private person as prospect, client or supplier) in Sellsy. Needs individuals.write.

sellsy_create_opportunity

WRITE: create a sales opportunity linked to a company, individual or contact. Needs a pipeline id and one of its step ids (see sellsy_list_opportunity_pipelines and sellsy_list_pipeline_steps). Needs opportunities.write.

sellsy_create_task

WRITE: create a task, optionally attached to a record and assigned to staff. Needs a label id (see sellsy_list_task_labels) and a due date-time. Needs tasks.write.

sellsy_get_company

Get one company by id. Needs companies.read.

sellsy_get_contact

Get one contact by id. Needs contacts.read.

sellsy_get_credit_note

Get one credit note by id. Needs credit-notes.read.

sellsy_get_estimate

Get one estimate by id, with its rows and amounts. Needs estimates.read.

sellsy_get_individual

Get one individual by id. Needs individuals.read.

sellsy_get_invoice

Get one invoice by id, with its rows, amounts and status. Needs invoices.read.

sellsy_get_item

Get one catalog item by id. Needs items.read.

sellsy_get_opportunity

Get one opportunity by id. Needs opportunities.read.

sellsy_get_order

Get one order by id. Needs orders.read.

sellsy_get_task

Get one task by id. Needs tasks.read.

sellsy_list_companies

List companies (customers, prospects, suppliers) with paging. Needs companies.read.

sellsy_list_company_contacts

List the contacts linked to one company (GET /companies/{id}/contacts). Needs companies.read and contacts.read.

sellsy_list_contacts

List contacts (people at companies) with paging. Needs contacts.read.

sellsy_list_credit_notes

List credit notes with paging. Needs credit-notes.read.

sellsy_list_estimates

List estimates (quotes) with paging. Needs estimates.read.

sellsy_list_individuals

List individuals (private customers, prospects, suppliers) with paging. Needs individuals.read.

sellsy_list_invoice_payments

List the payments linked to one invoice. Needs invoices.read and payments.read.

sellsy_list_invoices

List invoices with paging. Needs invoices.read.

sellsy_list_items

List catalog items (products, services, shipping, packaging) with paging. Needs items.read.

sellsy_list_opportunities

List sales opportunities with paging. Needs opportunities.read.

sellsy_list_opportunity_pipelines

List the sales pipelines (needed to create an opportunity: pipeline id and step id). Needs opportunities.read.

sellsy_list_orders

List orders with paging. Needs orders.read.

sellsy_list_pipeline_steps

List the steps of one opportunity pipeline. Needs opportunities.read.

sellsy_list_staffs

List the staff members of the account (the list may hold only yourself, depending on the Sellsy plan). Needs staffs.read.

sellsy_list_task_labels

List the task labels (a label id is required to create a task). Needs tasks.read.

sellsy_list_tasks

List tasks with paging. Needs tasks.read.

sellsy_search

Free-text search over companies, individuals, contacts, opportunities, items, documents and staff in one call (GET /search). Use it to find a record by name, email or number when you do not know its type. Needs the search.read scope.

sellsy_search_comments

Search comments and notes by author, date, parent comment or the company/individual/contact they are attached to. Needs comments.read.

sellsy_search_companies

Search companies by name, email, type (prospect/client/supplier), reference, VAT, SIRET, country, postal code, creation or update date. Needs companies.read.

sellsy_search_contacts

Search contacts by last name, email, phone, linked company or individual, creation date. Needs contacts.read.

sellsy_search_estimates

Search estimates by status, number, date, currency, owner, contact or related company/individual/opportunity. Needs estimates.read.

sellsy_search_individuals

Search individuals by name, email, type, reference, country, postal code, creation or update date. Needs individuals.read.

sellsy_search_invoices

Search invoices by status (draft/due/payinprogress/paid/late/cancelled), number, date, currency, owner, or related company/individual/opportunity. Use it for unpaid or late invoices. Needs invoices.read.

sellsy_search_items

Search catalog items by name, reference or type. Needs items.read.

sellsy_search_opportunities

Search opportunities by name, number, pipeline, step, status (open/won/lost/cancelled/closed/late), amount, owner or due date. Needs opportunities.read.

sellsy_search_orders

Search orders by status or delivery status, or related company/individual/opportunity. Needs orders.read.

sellsy_search_payments

Search payments by status (pending/confirmed/rejected/failed/refund) or related company/individual. Needs payments.read.

sellsy_search_tasks

Search tasks by status (todo/done), owner, assignee, label, due date or related record. Needs tasks.read.

Endpoints

URL	Transport	State	Latency	Checked
https://sellsy.usefulapi.io/mcp	streamable-http	answering	145 ms	2 min ago

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Sellsy MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Sellsy MCP by usefulapi do?

It exposes 44 tools, read directly from the server on our last check. Among them: sellsy_create_comment, sellsy_create_company, sellsy_create_contact, sellsy_create_individual, sellsy_create_opportunity, sellsy_create_task and 38 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Sellsy MCP by usefulapi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 167 ms. The bar chart above shows every period we have measured.

How do I connect Sellsy MCP by usefulapi?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Sellsy MCP by usefulapi need an API key?

No. Sellsy MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 44 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Sellsy MCP by usefulapi?

It answers our handshake in 167 ms on average, which is faster than 79% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Sellsy MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at sellsy.usefulapi.io, which runs on its operator's own terms.