Sellsy
Search and manage customers, invoices, opportunities and tasks in your Sellsy CRM
Connects to Sellsy CRM to search and read companies, contacts, opportunities, invoices, estimates, orders and tasks. Create new company and individual records. Requires Sellsy account and API credentials.
Try asking Muse: "Show me all unpaid invoices from this month and which customers they're from"
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Source: Found in the official MCP Registry (io.usefulapi/sellsy) · First listed October 30, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://sellsy.usefulapi.io/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Sellsy is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://sellsy.usefulapi.io/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 2245ms. Worked in n/a of checks over 30 days.
Screening · October 30, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 40
sellsy_searchFree-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_list_companiesList companies (customers, prospects, suppliers) with paging. Needs companies.read.sellsy_search_companiesSearch companies by name, email, type (prospect/client/supplier), reference, VAT, SIRET, country, postal code, creation or update date. Needs companies.read.sellsy_get_companyGet one company by id. Needs companies.read.sellsy_list_company_contactsList the contacts linked to one company (GET /companies/{id}/contacts). Needs companies.read and contacts.read.sellsy_list_individualsList individuals (private customers, prospects, suppliers) with paging. Needs individuals.read.sellsy_search_individualsSearch individuals by name, email, type, reference, country, postal code, creation or update date. Needs individuals.read.sellsy_get_individualGet one individual by id. Needs individuals.read.sellsy_list_contactsList contacts (people at companies) with paging. Needs contacts.read.sellsy_search_contactsSearch contacts by last name, email, phone, linked company or individual, creation date. Needs contacts.read.sellsy_get_contactGet one contact by id. Needs contacts.read.sellsy_list_opportunitiesList sales opportunities with paging. Needs opportunities.read.sellsy_search_opportunitiesSearch opportunities by name, number, pipeline, step, status (open/won/lost/cancelled/closed/late), amount, owner or due date. Needs opportunities.read.sellsy_get_opportunityGet one opportunity by id. Needs opportunities.read.sellsy_list_opportunity_pipelinesList the sales pipelines (needed to create an opportunity: pipeline id and step id). Needs opportunities.read.sellsy_list_pipeline_stepsList the steps of one opportunity pipeline. Needs opportunities.read.sellsy_list_estimatesList estimates (quotes) with paging. Needs estimates.read.sellsy_search_estimatesSearch estimates by status, number, date, currency, owner, contact or related company/individual/opportunity. Needs estimates.read.sellsy_get_estimateGet one estimate by id, with its rows and amounts. Needs estimates.read.sellsy_list_invoicesList invoices with paging. Needs invoices.read.sellsy_search_invoicesSearch 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_get_invoiceGet one invoice by id, with its rows, amounts and status. Needs invoices.read.sellsy_list_invoice_paymentsList the payments linked to one invoice. Needs invoices.read and payments.read.sellsy_list_ordersList orders with paging. Needs orders.read.sellsy_search_ordersSearch orders by status or delivery status, or related company/individual/opportunity. Needs orders.read.sellsy_get_orderGet one order by id. Needs orders.read.sellsy_list_credit_notesList credit notes with paging. Needs credit-notes.read.sellsy_get_credit_noteGet one credit note by id. Needs credit-notes.read.sellsy_list_itemsList catalog items (products, services, shipping, packaging) with paging. Needs items.read.sellsy_search_itemsSearch catalog items by name, reference or type. Needs items.read.sellsy_get_itemGet one catalog item by id. Needs items.read.sellsy_search_paymentsSearch payments by status (pending/confirmed/rejected/failed/refund) or related company/individual. Needs payments.read.sellsy_list_tasksList tasks with paging. Needs tasks.read.sellsy_search_tasksSearch tasks by status (todo/done), owner, assignee, label, due date or related record. Needs tasks.read.sellsy_get_taskGet one task by id. Needs tasks.read.sellsy_list_task_labelsList the task labels (a label id is required to create a task). Needs tasks.read.sellsy_search_commentsSearch comments and notes by author, date, parent comment or the company/individual/contact they are attached to. Needs comments.read.sellsy_list_staffsList the staff members of the account (the list may hold only yourself, depending on the Sellsy plan). Needs staffs.read.sellsy_create_companyWRITE: create a company record in Sellsy (a prospect, client or supplier). Needs companies.write. Nothing is sent to the company.sellsy_create_individualWRITE: create an individual (a private person as prospect, client or supplier) in Sellsy. Needs individuals.write.Link
https://sellsy.usefulapi.io/mcpQuestions about Sellsy in Muse
How do I connect Sellsy to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Sellsy to help me. It is a free service with an MCP server at https://sellsy.usefulapi.io/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Sellsy working right now?
At the last check (October 30, 2026, 00:26 UTC) the endpoint was working, answering in 2245ms. It is checked every 15 minutes.
Is Sellsy safe to connect to Muse?
It was screened on October 30, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Sellsy do in Muse?
It exposes 40 tools, including sellsy_search, sellsy_list_companies, sellsy_search_companies, sellsy_get_company. For example, you could ask Muse: "Show me all unpaid invoices from this month and which customers they're from"
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This listing was added from public sources (Found in the official MCP Registry (io.usefulapi/sellsy)). If you build Sellsy, claim it to correct the details and get your badge.
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