smallinvoice MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.13.4Updated Nov 7, 2026

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

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableProductivity & WorkflowFinanceBusiness & Commerce

Overview

AI-generated overview

Hosted smallinvoice connector that lets an assistant read contacts, invoices, offers, projects and hours, and create contacts and invoices.

What you can do
  • Check the connected account owner and connection status
  • List and read contacts, their addresses, contact people and contact groups
  • List and read invoices with positions, totals and recorded payments
  • List and read offers, order confirmations and delivery notes
  • List catalog products, services, units and bank accounts
  • List projects, working hours, efforts, activities and cost units
When to use it
Useful when you want an assistant to answer questions about a smallinvoice account, such as which invoices are still open, who owes the most, or how many hours were booked per project, and to draft new contacts or invoices without opening the app.
Requirements
A remote MCP endpoint added by URL only; sign-in happens through OAuth with your smallinvoice credentials, so no API key or Authorization header goes in the client config. A smallinvoice account is required, and the free plan allows 50 tool calls per month.
Before you install
Two tools write data: creating a contact and creating an invoice, which is not idempotent, so a repeated call creates a second invoice; created invoices are not sent to anyone. The server also offers paid plans (Pro and Pro+) with Stripe payment links and a subscription cancellation tool, so spending can be triggered from a chat. Your smallinvoice credentials are entered on the provider's login page.

Installation

In SourceWeft

  1. Open smallinvoice MCP by usefulapi in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.usefulapi%2Fsmallinvoice/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "smallinvoice-by-usefulapi": {
      "type": "http",
      "url": "https://smallinvoice.usefulapi.io/mcp"
    }
  }
}

README

smallinvoice MCP by usefulapi

Live endpoint: https://smallinvoice.usefulapi.io/mcp · Homepage: https://usefulapi.io/smallinvoice

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://smallinvoice.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http smallinvoice https://smallinvoice.usefulapi.io/mcp, then run /mcp to log in.
  • VS Code: Add to VS Code.
  • Cursor and other clients: add the URL as a remote MCP server:
json
{  "mcpServers": {    "smallinvoice": {      "url": "https://smallinvoice.usefulapi.io/mcp"    }  }}

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your smallinvoice credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/smallinvoice/

Tools

ToolTypeWhat it does
smallinvoice_get_ownerreadGet the account owner
smallinvoice_list_contactsreadList contacts
smallinvoice_get_contactreadGet a contact
smallinvoice_list_contact_addressesreadList a contact's addresses
smallinvoice_list_contact_peoplereadList a contact's people
smallinvoice_list_contact_groupsreadList contact groups
smallinvoice_list_invoicesreadList invoices
smallinvoice_get_invoicereadGet an invoice
smallinvoice_list_invoice_paymentsreadList payments of an invoice
smallinvoice_list_offersreadList offers
smallinvoice_get_offerreadGet an offer
smallinvoice_list_order_confirmationsreadList order confirmations
smallinvoice_get_order_confirmationreadGet an order confirmation
smallinvoice_list_delivery_notesreadList delivery notes
smallinvoice_get_delivery_notereadGet a delivery note
smallinvoice_list_productsreadList catalog products
smallinvoice_list_servicesreadList catalog services
smallinvoice_list_unitsreadList units
smallinvoice_list_bank_accountsreadList bank accounts
smallinvoice_list_projectsreadList projects
smallinvoice_get_projectreadGet a project
smallinvoice_list_working_hoursreadList working hours
smallinvoice_list_effortsreadList efforts
smallinvoice_list_activitiesreadList activities
smallinvoice_list_cost_unitsreadList cost units
smallinvoice_create_contactwriteCreate a contact
smallinvoice_create_invoicewriteCreate an invoice
smallinvoice_usage_statusmetaUsage status (free-tier meter)
smallinvoice_request_featuremetaRequest a missing feature
smallinvoice_upgrademetaUpgrade to Pro or Pro+
smallinvoice_cancel_subscriptionmetaCancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Pro (per account)$9/mo or $90/yr (2 months free)Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with smallinvoice_upgrade (it returns a Stripe Checkout link). Cancel any time with smallinvoice_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running smallinvoice_upgrade before then undoes the cancel. Or write to [email protected].

License

Source: servers/smallinvoice/README.md at commit 4046075

Tools

27

smallinvoice_get_owner

Get the account owner

The smallinvoice account the API client belongs to (the owner's id and details). A cheap check that the connection works. GET /auth/owner.

Takes no parameters.

smallinvoice_list_contacts

List contacts

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_get_contact

Get a contact

One contact by id, with its fields. Add with=main_address for the main address. Needs the "contact" scope. GET /contacts/{id}.

Parametersidrequiredwith

smallinvoice_list_contact_addresses

List a contact's addresses

All addresses of one contact. Needs the "contact" scope. GET /contacts/{contactId}/addresses.

Parameterslimitoffsetcontact_idrequired

smallinvoice_list_contact_people

List a contact's people

The contact persons of one company contact. Needs the "contact" scope. GET /contacts/{contactId}/people.

Parameterslimitoffsetcontact_idrequired

smallinvoice_list_contact_groups

List contact groups

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_invoices

List invoices

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.

Parametersqsortwithlimitfilteroffsetcontact_id

smallinvoice_get_invoice

Get an invoice

One invoice by id with its positions, totals and status. Needs the "invoice" scope. GET /receivables/invoices/{id}.

Parametersidrequiredwith

smallinvoice_list_invoice_payments

List payments of an invoice

The payments recorded on one invoice. Needs the "invoice" scope. GET /receivables/invoices/{invoiceId}/payments.

Parameterslimitoffsetinvoice_idrequired

smallinvoice_list_offers

List offers

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.

Parametersqsortwithlimitfilteroffsetcontact_id

smallinvoice_get_offer

Get an offer

One offer (quote) by id with its positions and totals. Needs the "offer" scope. GET /receivables/offers/{id}.

Parametersidrequiredwith

smallinvoice_list_order_confirmations

List order confirmations

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.

Parametersqsortwithlimitfilteroffsetcontact_id

smallinvoice_get_order_confirmation

Get an order confirmation

One order confirmation by id. Needs the "order_confirmation" scope. GET /receivables/order-confirmations/{id}.

Parametersidrequiredwith

smallinvoice_list_delivery_notes

List delivery notes

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.

Parametersqsortwithlimitfilteroffsetcontact_id

smallinvoice_get_delivery_note

Get a delivery note

One delivery note by id. Needs the "delivery_note" scope. GET /receivables/delivery-notes/{id}.

Parametersidrequiredwith

smallinvoice_list_products

List catalog products

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_services

List catalog services

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_units

List units

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_bank_accounts

List bank accounts

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_projects

List projects

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_get_project

Get a project

One project by id. Needs the "project" scope. GET /reporting/projects/{id}.

Parametersidrequiredwith

smallinvoice_list_working_hours

List working hours

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_efforts

List efforts

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_activities

List activities

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_list_cost_units

List cost units

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.

Parametersqsortwithlimitfilteroffset

smallinvoice_create_contact

Create a contact

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_contacts first so you do not create a duplicate.

Parameterscityrequirednamerequiredemailstreetrequiredcountryrequiredcurrencypostcoderequiredrelation

smallinvoice_create_invoice

Create an invoice

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_contacts / smallinvoice_list_units first for the ids.

Parametersduerequireddaterequiredcurrencyrequiredlanguagerequiredpositionsrequiredcontact_idrequiredcontact_address_idrequired

Version history

12
  1. v1.13.4LatestNov 7, 2026
  2. v1.12.3Nov 5, 2026
  3. v1.12.2Nov 5, 2026
  4. v1.12.1Nov 4, 2026
  5. v1.12.0Nov 3, 2026
  6. v1.11.1Nov 3, 2026
  7. v1.10.0Nov 1, 2026
  8. v1.8.0Oct 31, 2026
  9. v1.7.0Oct 31, 2026
  10. v1.6.2Oct 30, 2026
  11. v1.6.0Oct 30, 2026
  12. v1.1.0Oct 26, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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