The Stackin MCP server,
connected in one click.
Issue and manage Brazilian fiscal documents: NF-e for goods, NFS-e for services. Connect the official Stackin MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Stackin to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http stackin https://mcp.stackin.io/mcpRun in your terminal, then restart Claude Code.
Stackin · https://mcp.stackin.io/mcp
What your AI can do with Stackin
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “issue_invoice”: Issue a Brazilian fiscal document: NFS-e or NF-e. This produces a legal fiscal document. Confirm the data with the user before calling when.”
“Use “consult_invoice”: Look up an invoice's current status by its access key. Read-only: it never changes the document.”
“Use “cancel_invoice”: Cancel an authorized invoice. Legal cancellation, with fiscal and accounting effect, inside a window the NFS-e authorizer enforces for the.”
“Use “get_invoice_pdf”: Return the printable rendering of a document, as a PDF. Works for both types — a DANFE for nfe, a DANFSe for nfse. The PDF comes back base6.”
How secure is the Stackin MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Stackin holds up.
Security grade A
gate scanned 16 tools on Oct 4, 2026 for prompt injection and risky tool definitions — nothing to flag.
- lowissue_invoice: Unusually long tool description
Official endpoint
Operated by Stackin (stackin.io) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Stackin adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Stackin
Choose Stackin in the gate directory. No sign-in needed.
Use it anywhere
Stackin's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Stackin exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
issue_invoice — Issue a Brazilian fiscal document: NFS-e or NF-e. This produces a legal fiscal document. Confirm the data with the user before calling when
consult_invoice — Look up an invoice's current status by its access key. Read-only: it never changes the document.
cancel_invoice — Cancel an authorized invoice. Legal cancellation, with fiscal and accounting effect, inside a window the NFS-e authorizer enforces for the
get_invoice_pdf — Return the printable rendering of a document, as a PDF. Works for both types — a DANFE for nfe, a DANFSe for nfse. The PDF comes back base6
reissue_invoice — Retry a rejected invoice after the data that caused the rejection was fixed. Takes the local invoice_id, not the access key: a rejected doc
correct_invoice — File an electronic correction letter (CC-e) against an NF-e. NF-e only: there is no correction letter for an NFS-e, where a wrong document
invalidate_numbering — Declare an NF-e numbering range reserved but never used. NF-e numbering has to be continuous, so a gap left by a failed issuance is explain
list_invoices — List the invoices this company issued, newest first. One document type at a time: pass nfse for services or nfe for goods. A company that i
+ 8 more tools once connected
Who runs the Stackin MCP server?
The Stackin MCP server at a glance
https://mcp.stackin.io/mcpQuestions, answered
Is there an official Stackin MCP server?
Yes — Stackin operates its own remote MCP server at mcp.stackin.io. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Stackin to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Stackin in the directory. No account or sign-in is needed. From then on, Stackin's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Stackin runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Stackin MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Stackin in minutes. No credit card required.
Connect more than just Stackin
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Stackin in: Claude · Claude Code · ChatGPT · Cursor · VS Code