The Nostr Signer MCP server,
connected in one click.
Approve Nostr signatures with your own browser signer without exposing a private key. Connect the official Nostr Signer 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 Nostr Signer 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 nostr-signer https://signer.frontiercrown.com/mcpRun in your terminal, then restart Claude Code.
Nostr Signer · https://signer.frontiercrown.com/mcp
What your AI can do with Nostr Signer
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “get_setup_url”: Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.”
“Use “get_signer_status”: Check whether a user-controlled NIP-07 or NIP-46 signer is connected.”
“Use “begin_nostrconnect_pairing”: Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.”
“Use “connect_bunker”: Connect a bunker:// URI only when the user knowingly supplied it. Prefer the local setup page so connection secrets are not placed in chat.”
How secure is the Nostr Signer MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Nostr Signer holds up.
Official endpoint
Operated by Nostr Signer (frontiercrown.com) 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 Nostr Signer 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 Nostr Signer
Choose Nostr Signer in the gate directory. No sign-in needed.
Use it anywhere
Nostr Signer'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 Nostr Signer exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
get_setup_url — Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.
get_signer_status — Check whether a user-controlled NIP-07 or NIP-46 signer is connected.
begin_nostrconnect_pairing — Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.
connect_bunker — Connect a bunker:// URI only when the user knowingly supplied it. Prefer the local setup page so connection secrets are not placed in chat.
get_public_key — Return the public key exposed by the currently paired signer.
prepare_note — Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.
prepare_event — Validate and bind an exact unsigned Nostr event for user review. This does not sign or publish. Show the user every field before requesting
sign_event — Ask the paired signer to approve and sign the exact event bound to a fresh intent. Requires explicit user intent and never publishes.
+ 11 more tools once connected
Who runs the Nostr Signer MCP server?
The Nostr Signer MCP server at a glance
https://signer.frontiercrown.com/mcpQuestions, answered
Is there an official Nostr Signer MCP server?
Yes — Nostr Signer operates its own remote MCP server at signer.frontiercrown.com. 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 Nostr Signer to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Nostr Signer in the directory. No account or sign-in is needed. From then on, Nostr Signer's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Nostr Signer runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Nostr Signer 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 Nostr Signer in minutes. No credit card required.
Connect more than just Nostr Signer
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Nostr Signer in: Claude · Claude Code · ChatGPT · Cursor · VS Code