smallinvoice MCP by usefulapi
Read smallinvoice contacts, invoices, offers, projects and hours; create contacts and invoices.
Connect it
Settings → Connectors → Add custom connector
URL: https://smallinvoice.usefulapi.io/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://smallinvoice.usefulapi.io/mcp{
"mcpServers": {
"smallinvoice": {
"url": "https://smallinvoice.usefulapi.io/mcp"
}
}
}claude mcp add --transport http smallinvoice https://smallinvoice.usefulapi.io/mcp{
"servers": {
"smallinvoice": {
"type": "http",
"url": "https://smallinvoice.usefulapi.io/mcp"
}
}
}27 tools, pulled live
smallinvoice_get_ownerread-onlyThe 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_contactsread-onlyList 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_contactread-onlyOne contact by id, with its fields. Add with=main_address for the main address. Needs the "contact" scope. GET /contacts/{id}.
smallinvoice_list_contact_addressesread-onlyAll addresses of one contact. Needs the "contact" scope. GET /contacts/{contactId}/addresses.
smallinvoice_list_contact_peopleread-onlyThe contact persons of one company contact. Needs the "contact" scope. GET /contacts/{contactId}/people.
smallinvoice_list_contact_groupsread-onlyList 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_invoicesread-onlyList 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_invoiceread-onlyOne invoice by id with its positions, totals and status. Needs the "invoice" scope. GET /receivables/invoices/{id}.
smallinvoice_list_invoice_paymentsread-onlyThe payments recorded on one invoice. Needs the "invoice" scope. GET /receivables/invoices/{invoiceId}/payments.
smallinvoice_list_offersread-onlyList 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_offerread-onlyOne offer (quote) by id with its positions and totals. Needs the "offer" scope. GET /receivables/offers/{id}.
smallinvoice_list_order_confirmationsread-onlyList 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_confirmationread-onlyOne order confirmation by id. Needs the "order_confirmation" scope. GET /receivables/order-confirmations/{id}.
smallinvoice_list_delivery_notesread-onlyList 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_noteread-onlyOne delivery note by id. Needs the "delivery_note" scope. GET /receivables/delivery-notes/{id}.
smallinvoice_list_productsread-onlyList 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_servicesread-onlyList 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_unitsread-onlyList 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_accountsread-onlyList 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_projectsread-onlyList 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_projectread-onlyOne project by id. Needs the "project" scope. GET /reporting/projects/{id}.
smallinvoice_list_working_hoursread-onlyList 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_effortsread-onlyList 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_activitiesread-onlyList 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_unitsread-onlyList 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 smallinvoice_list_contacts first so you do not create a duplicate.
smallinvoice_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 smallinvoice_list_contacts / smallinvoice_list_units first for the ids.
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