MCP server

smallinvoice MCP by usefulapi

io.usefulapi/smallinvoice

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Read smallinvoice contacts, invoices, offers, projects and hours; create contacts and invoices.

Website Source

At a glance

Type

MCP server

Publisher

usefulapi.io (verified by the MCP Registry)

Status

Working at last check

Tools

27

Token cost

About 9,103 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

{"mcpServers":{"smallinvoice":{"httpUrl":"https://smallinvoice.usefulapi.io/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add smallinvoice https://smallinvoice.usefulapi.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"smallinvoice","server_url":"https://smallinvoice.usefulapi.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"smallinvoice","server_url":"https://smallinvoice.usefulapi.io/mcp"}

Tools

• smallinvoice_create_contact ~456 tokens
  WRITE: 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_contac
• smallinvoice_create_invoice Moves money · ~664 tokens
  WRITE: 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_con
• smallinvoice_get_contact ~180 tokens
  One contact by id, with its fields. Add with=main_address for the main address. Needs the "contact" scope. GET /contacts/{id}.
• smallinvoice_get_delivery_note ~165 tokens
  One delivery note by id. Needs the "delivery_note" scope. GET /receivables/delivery-notes/{id}.
• smallinvoice_get_invoice ~177 tokens
  One invoice by id with its positions, totals and status. Needs the "invoice" scope. GET /receivables/invoices/{id}.
• smallinvoice_get_offer ~174 tokens
  One offer (quote) by id with its positions and totals. Needs the "offer" scope. GET /receivables/offers/{id}.
• smallinvoice_get_order_confirmation ~172 tokens
  One order confirmation by id. Needs the "order_confirmation" scope. GET /receivables/order-confirmations/{id}.
• smallinvoice_get_owner ~84 tokens
  The smallinvoice account the API client belongs to (the owner's id and details). A cheap check that the connection works. GET /auth/owner.
• smallinvoice_get_project ~166 tokens
  One project by id. Needs the "project" scope. GET /reporting/projects/{id}.
• smallinvoice_list_activities ~410 tokens
  List 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_bank_accounts ~413 tokens
  List 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_contact_addresses ~184 tokens
  All addresses of one contact. Needs the "contact" scope. GET /contacts/{contactId}/addresses.
• smallinvoice_list_contact_groups ~402 tokens
  List 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_contact_people ~186 tokens
  The contact persons of one company contact. Needs the "contact" scope. GET /contacts/{contactId}/people.
• smallinvoice_list_contacts ~428 tokens
  List 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_list_cost_units ~397 tokens
  List 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_list_delivery_notes ~454 tokens
  List 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_list_efforts ~408 tokens
  List 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_invoice_payments ~189 tokens
  The payments recorded on one invoice. Needs the "invoice" scope. GET /receivables/invoices/{invoiceId}/payments.
• smallinvoice_list_invoices ~461 tokens
  List 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_list_offers ~447 tokens
  List 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_list_order_confirmations ~460 tokens
  List 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_list_products ~401 tokens
  List 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_projects ~395 tokens
  List 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_list_services ~398 tokens
  List 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_units ~422 tokens
  List 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_working_hours ~410 tokens
  List 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.

Browse

• Email
• Payments
• Invoicing and accounting

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