MCP server

Nostr Signer

com.frontiercrown.signer/nostr-signer

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

Approve Nostr signatures with your own browser signer without exposing a private key.

Source

At a glance

Type

MCP server

Publisher

frontiercrown.com (verified by the MCP Registry)

Status

Working at last check

Tools

17

Token cost

About 2,366 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http nostr-signer https://signer.frontiercrown.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.nostr-signer]
url = "https://signer.frontiercrown.com/mcp"

Gemini CLI

{"mcpServers":{"nostr-signer":{"httpUrl":"https://signer.frontiercrown.com/mcp"}}}

Cursor

{"mcpServers":{"nostr-signer":{"url":"https://signer.frontiercrown.com/mcp"}}}

VS Code

{"servers":{"nostr-signer":{"type":"http","url":"https://signer.frontiercrown.com/mcp"}}}

Antigravity

agy mcp add nostr-signer https://signer.frontiercrown.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"nostr-signer","server_url":"https://signer.frontiercrown.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"nostr-signer","server_url":"https://signer.frontiercrown.com/mcp"}

Tools

• approve_grynvault_browser_handoff ~221 tokens
  Sign a short-lived, read-only Grynvault account handoff code so the browser tab that created it can receive its own dashboard. This does not create an invoice, publish a Nostr event, change settlement, or grant wallet custody.
• begin_nostrconnect_pairing ~110 tokens
  Advanced fallback: create a nostrconnect:// URI for the user to scan or open in a remote signer. Never accepts an nsec.
• connect_bunker ~119 tokens
  Connect a bunker:// URI only when the user knowingly supplied it. Prefer the local setup page so connection secrets are not placed in chat. Never accepts an nsec.
• create_grynvault_nip05_invoice ~180 tokens
  After separate explicit user confirmation, sign the prepared authorization and create exactly one pending 2,000-sat name@frontiercrown.com invoice. Does not pay, settle, activate, or prove identity.
• create_grynvault_supporter_invoice ~180 tokens
  After separate explicit user confirmation, sign the prepared authorization and create exactly one pending Grynvault supporter invoice. Does not pay it and never treats a redirect as settlement.
• disconnect_signer ~116 tokens
  Forget the in-memory signer session and all prepared events.
• get_grynvault_account_dashboard ~163 tokens
  Read the connected Nostr identity's Grynvault supporter, payment, and NIP-05 dashboard using a short-lived signed authorization. This does not create an invoice or change settlement.
• get_public_key ~59 tokens
  Return the public key exposed by the currently paired signer.
• get_setup_url ~70 tokens
  Return the loopback-only page used to connect a NIP-07 browser extension or an advanced NIP-46 signer.
• get_signer_status ~62 tokens
  Check whether a user-controlled NIP-07 or NIP-46 signer is connected.
• prepare_event ~212 tokens
  Validate and bind an exact unsigned Nostr event for user review. This does not sign or publish. Show the user every field before requesting a signature.
• prepare_grynvault_nip05_invoice ~135 tokens
  Check and normalize a name@frontiercrown.com identifier, then prepare its exact 2,000-sat invoice authorization. Does not sign, reserve the name, create, pay, or settle an invoice.
• prepare_grynvault_supporter_invoice ~155 tokens
  Prepare an exact, short-lived signed-authorization request for a one-time donation of 21 to 1,000,000 sats or the fixed 2,100-sat 30-day membership. Does not sign, create, pay, or settle an invoice.
• prepare_note ~99 tokens
  Prepare and bind an exact unsigned kind:1 note for user review. This does not sign or publish.
• publish_event Sends messages · ~165 tokens
  Publish a previously verified signed event to configured relays. Requires separate explicit user intent.
• query_events ~170 tokens
  Read a bounded set of verified public profile or note events from selected relays.
• sign_event ~150 tokens
  Ask the paired signer to approve and sign the exact event bound to a fresh intent. Requires explicit user intent and never publishes.

Browse

• Payments
• Invoicing and accounting

Related MCP servers

• Crank Protocol
  Non-custodial DeFi tools for AI agents on Solana: swaps, perps, lending, staking, equities.
• Kamy
  Document API for AI-native software: render PDFs, e-sign, PAdES-seal, and verify.
• Vurto Swap
  Token swaps at the best net price on 9 EVM chains and Solana. No API key, non-custodial.
• SatsDNS
  DNS hosting, secondary DNS and dynamic DNS paid per call in sats; optional Nostr account tools.
• HODLXXI Read-Only
  Public read-only MCP server for HODLXXI agent identity, trust, receipts, and verification.
• TaScan
  36 MCP tools for projects, tasks, workers, QR/NFC tags, and AI remediation. Task. Scan. Done.
• Assinafy
  Send documents for legally valid e-signature in Brazil, track signers and download signed files.
• emem, the verifiable memory protocol for the physical world
  Shared, verifiable memory for machines and AI. Encode where data lives; decode with any AI.

Badge for your README

[![AptLynx](https://aptlynx.net/badge/com.frontiercrown.signer/nostr-signer.svg)](https://aptlynx.net/servers/com.frontiercrown.signer/nostr-signer)

Listing text is written by the maker; AptLynx lists tools and does not vouch for them. Find another tool · Browse by topic · For agents