FiscalHub MCP server

Read NF-e XML and NCM tax data, simulate totals, issue and cancel NF-e and NFC-e in FiscalHub. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect FiscalHubFree 50 tool calls / monthPro $9/mo · $90/yr · pricing13 tools

What can I ask?

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

What you can do with FiscalHub in Claude and ChatGPT

For Brazilian companies that issue NF-e and NFC-e fiscal documents with FiscalHub.

Look up the tax data for a product code

Search NCM codes by a code or description term, then read the IPI rate, CEST and unit of one code.

Simulate the totals of a sale before issuing

Simulate the ICMS, IPI, PIS, COFINS and invoice totals of an NF-e. Nothing is issued or stored.

Recover an authorized NF-e XML

Fetch the authorized NF-e XML for an access key from the SEFAZ, when the file was not stored locally.

Check documents received against a CNPJ

List the NF-es and events received against a company CNPJ, in NSU order. Pass the last NSU to get only new documents.

Issue or cancel an NF-e or NFC-e

Issue an NF-e or NFC-e for SEFAZ authorization, or cancel an authorized one with a justification. The tax authority keeps these records.

Changes data

How do I connect FiscalHub?

Before you connect

The login page asks for your FiscalHub API key.

Create the key in the FiscalHub portal under API Keys. A fh_live_ key issues real documents for production companies. 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 FiscalHub and this URL, then click Add:
    https://fiscalhub.usefulapi.io/mcp
  3. Claude opens the login page: enter your FiscalHub API key.
  4. In a chat, click + → Connectors and turn on FiscalHub.

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 FiscalHub and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://fiscalhub.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your FiscalHub API key.
  4. In Plugins, install FiscalHub, 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 fiscalhub https://fiscalhub.usefulapi.io/mcp

Cursor

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

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

VS Code

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

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

Codex

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

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

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://fiscalhub.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 FiscalHub 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 FiscalHub server only. Ask your AI to run fiscalhub_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 fiscalhub_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 fiscalhub_upgrade before then undoes the cancel. Or write to [email protected].

Tools 13

Show all 13 tools (the AI picks them for you)

Read only · 5

  • Get an NF-e XMLfiscalhub_get_nfe_xml
    Get the authorized NF-e XML (nfe-proc: NF-e plus protocol) for an access key, fetched from the SEFAZ. Use it to recover an XML that was not stored locally.
  • List received NF-e (DFe)fiscalhub_list_received_nfe
    List NF-es and events issued against a company's CNPJ, fetched from the SEFAZ (Distribuicao DFe), in NSU order. Pass the returned ultNsu next time to get only new documents. Each document has its schema (resNFe, nfeProc or procEventoNFe).
  • Get an NCM codefiscalhub_get_ncm
    Get the tax data of one exact NCM product code: description, IPI rate, CEST and unit of measure.
  • Search NCM codesfiscalhub_search_ncm
    Search NCM product codes by a partial code or a description term. Use it to find the NCM for a product before issuing a document.
  • Simulate NF-e totalsfiscalhub_simulate_nfe_totals
    Simulate the tax totals of an NF-e (ICMS, IPI, PIS, COFINS, DIFAL, IBS, CBS and the invoice total) before issuing it. Nothing is issued or stored.

Changes data · 4

  • Issue an NF-efiscalhub_emit_nfe
    DESTRUCTIVE: issues an NF-e (model 55) and sends it to the SEFAZ for authorization. A production company issues a legal document that the customer must cancel if it is wrong. Whether it is homologation or production depends on the company's setting in FiscalHub.
  • Cancel an NF-efiscalhub_cancel_nfe
    DESTRUCTIVE: cancels an authorized NF-e by its access key, with a required justification. The tax authority records the cancellation and it cannot be undone.
  • Issue an NFC-efiscalhub_emit_nfce
    DESTRUCTIVE: issues a consumer NFC-e (model 65) and sends it to the SEFAZ for authorization. It has the same fields as an NF-e; the API applies model 65. The company's environment (homologation or production) is set in FiscalHub.
  • Cancel an NFC-efiscalhub_cancel_nfce
    DESTRUCTIVE: cancels an authorized NFC-e by its access key, with a required justification. The tax authority records the cancellation and it cannot be undone.

Your usefulapi plan · 4

  • Usage status (free-tier meter)fiscalhub_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 featurefiscalhub_request_feature
    Tell usefulapi that the user needs something the FiscalHub 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+fiscalhub_upgrade
    Get a paid plan for FiscalHub (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 subscriptionfiscalhub_cancel_subscription
    Cancel the caller's FiscalHub 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 fiscalhub_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with FiscalHub in Claude or ChatGPT?

Look up the tax data for a product code. Simulate the totals of a sale before issuing. Recover an authorized NF-e XML. Check documents received against a CNPJ. Issue or cancel an NF-e or NFC-e. See what you can do for the details.

Is this an official FiscalHub product?

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

Can I connect FiscalHub 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 FiscalHub API key. See Before you connect for where to find it.

Do I put my FiscalHub 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 FiscalHub 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 FiscalHub credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the FiscalHub 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 FiscalHub.

Can the AI change my FiscalHub data?

Yes, if you approve it. 4 of the 9 FiscalHub tools can create or change data. The other 5 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 FiscalHub server only. Cancel any time: your paid plan then runs to the end of the paid period. Run fiscalhub_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run fiscalhub_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 fiscalhub_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a FiscalHub tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with fiscalhub_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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