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100
MCP live MCP 2025-11-25 streamable-http

Nostr Signer

com.frontiercrown.signer/nostr-signer

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

Watch this dependency Share evidence report
Uptime
100.0%
5 direct probes · 30d
Response
482ms
last probe
Tools
17
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://signer.frontiercrown.com/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
17 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
17 items in total; 3 or more earns these points.
pass Describes itself 10/10
85 characters; more than 30 earns these points.

Tools · 17

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. Never accepts an nsec.

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 a signature.

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.

publish_event

Publish a previously verified signed event to configured relays. Requires separate explicit user intent.

query_events

Read a bounded set of verified public profile or note events from selected relays.

disconnect_signer

Forget the in-memory signer session and all prepared events.

get_grynvault_account_dashboard

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.

approve_grynvault_browser_handoff

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…

prepare_grynvault_supporter_invoice

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.

create_grynvault_supporter_invoice

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.

prepare_grynvault_nip05_invoice

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.

create_grynvault_nip05_invoice

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.

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://signer.frontiercrown.com/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "nostr_signer": {
      "url": "https://signer.frontiercrown.com/mcp",
      "transport": "streamable-http"
    }
  }
}