smallinvoice
Read and create invoices, contacts, offers, projects and time tracking in smallinvoice
Connects to smallinvoice accounting software. Read invoices, offers, delivery notes, contacts, projects, working hours and expenses. Create new company contacts and invoices. Requires smallinvoice account and API access.
Try asking Muse: "Create an invoice for a customer with line items and set the due date"
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Source: Found in the official MCP Registry (io.usefulapi/smallinvoice) · 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.
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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://smallinvoice.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
smallinvoice 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://smallinvoice.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 · 27
smallinvoice_get_ownerThe smallinvoice account the API client belongs to (the owner's id and details). A cheap check that the connection works. GET /auth/owner.smallinvoice_list_contactsList contacts (customers and suppliers): name, type (company or person), relation, e-mail, currency. Add with=main_address for the address. Needs the "contact" scope. GET /contacts. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_contactOne contact by id, with its fields. Add with=main_address for the main address. Needs the "contact" scope. GET /contacts/{id}.smallinvoice_list_contact_addressesAll addresses of one contact. Needs the "contact" scope. GET /contacts/{contactId}/addresses.smallinvoice_list_contact_peopleThe contact persons of one company contact. Needs the "contact" scope. GET /contacts/{contactId}/people.smallinvoice_list_contact_groupsList the contact groups. Needs the "contact" scope. GET /contacts/configuration/groups. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_invoicesList invoices: number, contact, dates, total, currency, status. Filter by contact_id or a JSON filter. Needs the "invoice" scope. GET /receivables/invoices. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_invoiceOne invoice by id with its positions, totals and status. Needs the "invoice" scope. GET /receivables/invoices/{id}.smallinvoice_list_invoice_paymentsThe payments recorded on one invoice. Needs the "invoice" scope. GET /receivables/invoices/{invoiceId}/payments.smallinvoice_list_offersList offers (quotes). Filter by contact_id or a JSON filter. Needs the "offer" scope. GET /receivables/offers. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_offerOne offer (quote) by id with its positions and totals. Needs the "offer" scope. GET /receivables/offers/{id}.smallinvoice_list_order_confirmationsList order confirmations. Filter by contact_id or a JSON filter. Needs the "order_confirmation" scope. GET /receivables/order-confirmations. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_order_confirmationOne order confirmation by id. Needs the "order_confirmation" scope. GET /receivables/order-confirmations/{id}.smallinvoice_list_delivery_notesList delivery notes. Filter by contact_id or a JSON filter. Needs the "delivery_note" scope. GET /receivables/delivery-notes. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_delivery_noteOne delivery note by id. Needs the "delivery_note" scope. GET /receivables/delivery-notes/{id}.smallinvoice_list_productsList the catalog's products (articles). Needs the "catalog" scope. GET /catalog/products. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_servicesList the catalog's services. Needs the "catalog" scope. GET /catalog/services. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_unitsList the units (piece, hour, ...) with their ids, which an invoice position's unit_id refers to. Needs the "configuration" scope. GET /catalog/configuration/units. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_bank_accountsList the account's bank accounts (as printed on documents). Needs the "configuration" scope. GET /configuration/bank-accounts. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_projectsList projects. Needs the "project" scope. GET /reporting/projects. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_get_projectOne project by id. Needs the "project" scope. GET /reporting/projects/{id}.smallinvoice_list_working_hoursList recorded working hours (time tracking entries). Needs the "working_hours" scope. GET /reporting/working-hours. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_effortsList efforts (expenses and services recorded against projects). Needs the "effort" scope. GET /reporting/efforts. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_activitiesList activities (the kinds of work that hours are booked on). Needs the "activity" scope. GET /reporting/activities. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_list_cost_unitsList cost units. Needs the "cost_unit" scope. GET /reporting/cost-units. Returns count, total, next_offset (pass it as offset for the next page) and the items.smallinvoice_create_contactWRITE: creates a new company contact (customer) in smallinvoice, with its main address. Needs the "contact" scope. POST /contacts. Nothing is sent to anyone. Private persons are not supported here (smallinvoice needs more fields for them): create those in smallinvoice. Check smalsmallinvoice_create_invoiceWRITE: creates a new invoice for a contact. Needs the "invoice" scope. POST /receivables/invoices. It is only created: it is NOT sent by e-mail or post and its status is not changed; the user reviews it in smallinvoice. Not idempotent: calling it twice creates two invoices. Use sLink
https://smallinvoice.usefulapi.io/mcpQuestions about smallinvoice in Muse
How do I connect smallinvoice to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use smallinvoice to help me. It is a free service with an MCP server at https://smallinvoice.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 smallinvoice 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 smallinvoice 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 smallinvoice do in Muse?
It exposes 27 tools, including smallinvoice_get_owner, smallinvoice_list_contacts, smallinvoice_get_contact, smallinvoice_list_contact_addresses. For example, you could ask Muse: "Create an invoice for a customer with line items and set the due date"
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