Fiscalo MCP server

Read and create customers, items and draft invoices in Fiscalo. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect FiscaloFree 50 tool calls / monthPro $9/mo · $90/yr · pricing17 tools

What can I ask?

Turn on the Fiscalo connector, then ask in plain words. The AI picks the tools.

What you can do with Fiscalo in Claude and ChatGPT

For Portuguese companies and accountants who prepare invoices in Fiscalo.

Check that the key works and which environment it uses

Test the connection with the API key. The answer shows whether the key uses the sandbox or production.

Find a customer and open the record

Search the customers by name, tax number or your own external id, then open one record by its Fiscalo id.

Prepare a draft invoice with lines

Create a draft for a customer in an active series, then add the lines. This tool cannot issue the draft: issuing stays in the Fiscalo Developer Center.

Changes data

Review documents and their status

List documents with their status, then open one to see its lines, taxes and totals.

Add a product or service to the catalog

Create a product or service with its unit price and tax rate, then list the catalog to check it.

Changes data

How do I connect Fiscalo?

Before you connect

The login page asks for your Fiscalo API key.

Create or copy a key in the Fiscalo Developer Center (API keys). The key sets the company and the environment. Your key is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name Fiscalo and this URL, then click Add:
    https://fiscalo.usefulapi.io/mcp
  3. Claude opens the login page: enter your Fiscalo API key.
  4. In a chat, click + → Connectors and turn on Fiscalo.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name Fiscalo and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://fiscalo.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your Fiscalo API key.
  4. In Plugins, install Fiscalo, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

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

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

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

VS Code

Add to VS Code or add this to .vscode/mcp.json:

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

Codex

Run these commands. The second one opens the login page:

codex mcp add fiscalo --url https://fiscalo.usefulapi.io/mcp
codex mcp login fiscalo

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://fiscalo.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: the login page asks for your Fiscalo API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Proper user$9/mo · $90/yr10,000 tool calls / month
Pro+per user$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this Fiscalo server only. Ask your AI to run fiscalo_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 fiscalo_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 fiscalo_upgrade before then undoes the cancel. Or write to [email protected].

Tools 17

Show all 17 tools (the AI picks them for you)

Read only · 9

  • Test the connectionfiscalo_connection_test
    Check that the API key works and show its environment (sandbox or production). Use this first.
  • List customersfiscalo_list_customers
    List customers of the company behind the API key. Filter by name, tax number or your own external_id.
  • Get a customerfiscalo_get_customer
    Get one customer by its Fiscalo id.
  • List itemsfiscalo_list_items
    List products and services in the catalog.
  • Get an itemfiscalo_get_item
    Get one product or service by its Fiscalo id.
  • List tax ratesfiscalo_list_tax_rates
    List the global tax-rate catalog (read-only). Use it to find the tax_rate_id for an item or a document line.
  • List document seriesfiscalo_list_document_series
    List the document series of the company. A draft needs an active series (series_id).
  • List documentsfiscalo_list_documents
    List documents (invoices, credit notes, quotes and others) with their status.
  • Get a documentfiscalo_get_document
    Get one document with its lines, taxes, totals and status (draft or issued).

Changes data · 4

  • Create a customerfiscalo_create_customer
    Create a customer (individual or company). Writes need production access on the company.
  • Create an itemfiscalo_create_item
    Create a product or service with its unit price and tax rate. Writes need production access on the company.
  • Create a document draftfiscalo_create_document_draft
    Create a draft document for a customer in an active series. The draft is NOT issued: this tool cannot issue or cancel a document. Repeating the same call sends the same Idempotency-Key, so it does not create a second draft.
  • Add a line to a draftfiscalo_add_document_line
    Add a line to a draft document. Only drafts accept lines; issued documents return document_not_editable. A retry adds the line again: check the document first.

Your usefulapi plan · 4

  • Usage status (free-tier meter)fiscalo_usage_status
    Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
  • Request a missing featurefiscalo_request_feature
    Tell usefulapi that the user needs something the Fiscalo tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
  • Upgrade to Pro or Pro+fiscalo_upgrade
    Get a paid plan for Fiscalo (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place (needs confirm: true; the price difference for the rest of the period is charged at once). Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
  • Cancel the Pro subscriptionfiscalo_cancel_subscription
    Cancel the caller's Fiscalo Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run fiscalo_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Fiscalo in Claude or ChatGPT?

Check that the key works and which environment it uses. Find a customer and open the record. Prepare a draft invoice with lines. Review documents and their status. Add a product or service to the catalog. See what you can do for the details.

Is this an official Fiscalo product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Fiscalo. The server calls the Fiscalo API with your own Fiscalo access, so it sees only the data that your account can see.

Can I connect Fiscalo to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your Fiscalo API key. See Before you connect for where to find it.

Do I put my Fiscalo key or an Authorization header in the client config?

No. 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: the login page asks for your Fiscalo API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my Fiscalo credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Fiscalo API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Fiscalo.

Can the AI change my Fiscalo data?

Yes, if you approve it. 4 of the 13 Fiscalo tools can create or change data. The other 9 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Fiscalo server only. Cancel any time: your paid plan then runs to the end of the paid period. Run fiscalo_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run fiscalo_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+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run fiscalo_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Fiscalo tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with fiscalo_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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