Zero Plus One MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.0.0Updated Nov 8, 2026

Read invoices, quotes, contacts, financial reports and bank reconciliation in Zero Plus One.

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableFinance Business & Commerce

Server details

Identifier: io.usefulapi/zero-plus-one
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Nov 8, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to usefulapi.io, which also runs its endpoint. That identifies the publisher; it does not make the server's tools safe.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

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Overview

AI-generated overview

Read-only access to Zero Plus One accounting data — invoices, quotes, contacts, financial reports and bank reconciliation — from an MCP client.

What you can do: List and fetch invoices, credit notes, quotes and recurring invoice templates
Look up customers and suppliers and their details
Read tax rates configured in the organization
Pull financial reports: profit and loss, balance sheet, trial balance, cash flow, VAT 201, KPI summary, aged receivables and payables, open invoices
Inspect bank reconciliation for a ledger account: summary, statement lines and suggested matches
Check usage against the plan, request a missing feature, and manage a Pro or Pro+ subscription
When to use it: Useful when you want an assistant to answer questions about a Zero Plus One company's books — outstanding invoices, who owes what, period reports, or which bank lines still need reconciling — without exporting data by hand.
Requirements: Remote hosted endpoint; no local install. Connect with the server URL only and sign in through OAuth with your Zero Plus One credentials. On first connect you supply a Zero Plus One API key (Settings → Developer, a Custom Connection key with the View scopes you need), which the server validates and stores per user.

Before you install

The server receives a Zero Plus One API key with read scopes for your accounting data; grant only the scopes you need. Free plan is limited to 50 tool calls per month; paid plans cost $9/month (Pro) or $39/month (Pro+) and upgrade returns a Stripe Checkout link, so confirm before paying. Cancelling stops at the end of the paid period with no refund for the current period. Feature requests are sent to the provider.

Installation

In SourceWeft

Open Zero Plus One MCP by usefulapi in the dashboard and add it to a workspace.
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%2Fzero-plus-one/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": {
    "zero-plus-one-by-usefulapi": {
      "type": "http",
      "url": "https://zero-plus-one.usefulapi.io/mcp"
    }
  }
}

README

Zero Plus One MCP by usefulapi

Use your Zero Plus One account from Claude, Cursor, or any MCP client. Read invoices, quotes, contacts, financial reports and bank reconciliation data. Hosted, no local install: connect with your own credentials.

Live endpoint: https://zero-plus-one.usefulapi.io/mcp · Homepage: https://usefulapi.io

Connect

Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://zero-plus-one.usefulapi.io/mcp.
Claude Code: claude mcp add --transport http zero-plus-one https://zero-plus-one.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": {    "zero-plus-one": {      "url": "https://zero-plus-one.usefulapi.io/mcp"    }  }}

{  "mcpServers": {    "zero-plus-one": {      "url": "https://zero-plus-one.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 Zero Plus One credentials.

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

On first connect you provide a Zero Plus One API key (Settings → Developer in Zero Plus One: a Custom Connection key with the View scopes you need). The server validates it and stores it per user. No keys go in config files.

Tools

Tool	Type	What it does
`zeroplusone_list_invoices`	read	List invoices
`zeroplusone_get_invoice`	read	Get an invoice
`zeroplusone_list_contacts`	read	List contacts
`zeroplusone_get_contact`	read	Get a contact
`zeroplusone_list_credit_notes`	read	List credit notes
`zeroplusone_get_credit_note`	read	Get a credit note
`zeroplusone_list_quotes`	read	List quotes
`zeroplusone_get_quote`	read	Get a quote
`zeroplusone_list_recurring_invoices`	read	List recurring invoices
`zeroplusone_get_recurring_invoice`	read	Get a recurring invoice
`zeroplusone_list_tax_rates`	read	List tax rates
`zeroplusone_get_tax_rate`	read	Get a tax rate
`zeroplusone_get_profit_and_loss`	read	Profit and loss report
`zeroplusone_get_balance_sheet`	read	Balance sheet
`zeroplusone_get_trial_balance`	read	Trial balance
`zeroplusone_get_cash_flow`	read	Cash flow report
`zeroplusone_get_vat_return`	read	VAT return (VAT 201)
`zeroplusone_get_kpi_summary`	read	KPI summary
`zeroplusone_get_aged_receivables`	read	Aged receivables
`zeroplusone_get_aged_payables`	read	Aged payables
`zeroplusone_get_open_invoices`	read	Open invoices report
`zeroplusone_get_reconciliation_summary`	read	Reconciliation summary
`zeroplusone_list_reconciliation_lines`	read	List bank lines to reconcile
`zeroplusone_get_reconciliation_suggestions`	read	Reconciliation suggestions
`zeroplusone_usage_status`	meta	Usage status (free-tier meter)
`zeroplusone_request_feature`	meta	Request a missing feature
`zeroplusone_upgrade`	meta	Upgrade to Pro or Pro+
`zeroplusone_cancel_subscription`	meta	Cancel 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

Each paid plan covers this server only. Ask your AI to run zeroplusone_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with zeroplusone_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with zeroplusone_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.

Source: servers/zero-plus-one/README.md at commit 0be0869

Tools

zeroplusone_list_invoices

List invoices

List the invoices in the organization. Zero Plus One API: GET /invoices (scope: View invoices).

Takes no parameters.

zeroplusone_get_invoice

Get an invoice

Get one invoice by id. Zero Plus One API: GET /invoices/{id}.

Parametersinvoice_idrequired

zeroplusone_list_contacts

List contacts

List customers and suppliers. Zero Plus One API: GET /contacts (scope: View customers & suppliers).

Takes no parameters.

zeroplusone_get_contact

Get a contact

Get one customer or supplier by id. Zero Plus One API: GET /contacts/{id}.

Parameterscontact_idrequired

zeroplusone_list_credit_notes

List credit notes

List credit notes. Zero Plus One API: GET /credit-notes.

Takes no parameters.

zeroplusone_get_credit_note

Get a credit note

Get one credit note by id. Zero Plus One API: GET /credit-notes/{id}.

Parameterscredit_note_idrequired

zeroplusone_list_quotes

List quotes

List quotes. Zero Plus One API: GET /quotes.

Takes no parameters.

zeroplusone_get_quote

Get a quote

Get one quote by id. Zero Plus One API: GET /quotes/{id}.

Parametersquote_idrequired

zeroplusone_list_recurring_invoices

List recurring invoices

List recurring invoice templates. Zero Plus One API: GET /recurring-invoices.

Takes no parameters.

zeroplusone_get_recurring_invoice

Get a recurring invoice

Get one recurring invoice template by id. Zero Plus One API: GET /recurring-invoices/{id}.

Parametersrecurring_invoice_idrequired

zeroplusone_list_tax_rates

List tax rates

List the tax rates set up in the organization. Zero Plus One API: GET /tax-rates.

Takes no parameters.

zeroplusone_get_tax_rate

Get a tax rate

Get one tax rate by id. Zero Plus One API: GET /tax-rates/{id}.

Parameterstax_rate_idrequired

zeroplusone_get_profit_and_loss

Profit and loss report

Profit and loss for a period. Zero Plus One API: GET /reports/profit-and-loss (scope: View financial reports).

Parameterstorequiredfromrequired

zeroplusone_get_balance_sheet

Balance sheet

Balance sheet as it stands now. Zero Plus One API: GET /reports/balance-sheet (scope: View financial reports).

Takes no parameters.

zeroplusone_get_trial_balance

Trial balance

Trial balance as it stands now. Zero Plus One API: GET /reports/trial-balance (scope: View financial reports).

Takes no parameters.

zeroplusone_get_cash_flow

Cash flow report

Cash flow for a period. Zero Plus One API: GET /reports/cash-flow (scope: View financial reports).

Parameterstorequiredfromrequired

zeroplusone_get_vat_return

VAT return (VAT 201)

VAT 201 return figures for a period. Zero Plus One API: GET /reports/vat-201 (scope: View financial reports).

Parameterstorequiredfromrequired

zeroplusone_get_kpi_summary

KPI summary

Key figures for the organization. Zero Plus One API: GET /reports/kpi-summary (scope: View financial reports).

Takes no parameters.

zeroplusone_get_aged_receivables

Aged receivables

Money customers owe, by age. Zero Plus One API: GET /reports/aged-receivables (scope: View financial reports).

Takes no parameters.

zeroplusone_get_aged_payables

Aged payables

Money the organization owes suppliers, by age. Zero Plus One API: GET /reports/aged-payables (scope: View financial reports).

Takes no parameters.

zeroplusone_get_open_invoices

Open invoices report

Invoices that are not fully paid. Zero Plus One API: GET /reports/open-invoices (scope: View financial reports).

Takes no parameters.

zeroplusone_get_reconciliation_summary

Reconciliation summary

Reconciliation progress for one ledger account. Zero Plus One API: GET /reconciliation/accounts/{accountId}/summary.

Parametersaccount_idrequired

zeroplusone_list_reconciliation_lines

List bank lines to reconcile

Bank statement lines for one ledger account. Zero Plus One API: GET /reconciliation/accounts/{accountId}/lines.

Parametersaccount_idrequired

zeroplusone_get_reconciliation_suggestions

Reconciliation suggestions

Suggested matches between bank lines and the ledger for one account. Zero Plus One API: GET /reconciliation/accounts/{accountId}/suggestions (scope: View reconciliation suggestions).

Parametersaccount_idrequired

Version history

v1.0.0LatestNov 8, 2026

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