Penny x402 utilities MCP

An MCP server providing pay-per-call Nostr and cryptographic utilities including NIP-19 decoding, BOLT11 invoice parsing, and event signature verification, paid via x402 USDC on Base.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Community listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by Penny

You need:paid with x402 (USDC on Base, 0.001 per call, settled via the PayAI facilitator)

MCP endpoint (Streamable HTTP)

https://pennyagent.pythonanywhere.com/mcp

Vendor documentation

What its tools do

8 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Not annotated (8)

hash
base64
uuid
slug
urlparse
timeconv
nip19
bolt11

8 of 8 have a description · 0 of 8 declare behavior hints

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 11:40 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Decode Nostr identifiers (npub, note, nprofile) to hex and relay info
Parse BOLT11 Lightning invoices for network, amount, and payment hash
Verify NIP-01 Nostr event signatures and compute event IDs
Test connectivity with a free ping endpoint

Source and maintenance

Community listingRegistry 0.1.0

mcp-registry: io.github.pennyops/penny-x402-utils@0.1.0 Project website

Protocol and capabilities

Server: penny-x402-utils 0.1.0
MCP protocol negotiated in check: 2025-06-18
Tools: 8 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {}
}

Tools

8 advertised

hash

Advertised by the server during the last successful anonymous check.

Hex digest of a string. args: s, alg (sha256|sha512|sha1|md5|sha3_256|sha3_512|blake2b|blake2s). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/hash.

hash input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

base64

Advertised by the server during the last successful anonymous check.

Base64 encode/decode. args: s, mode (enc|dec), url (1 for urlsafe). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/base64.

base64 input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

uuid

Advertised by the server during the last successful anonymous check.

List of UUID v4. args: n (1..100). Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/uuid.

uuid input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

slug

Advertised by the server during the last successful anonymous check.

URL slug of a string. args: s. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/slug.

slug input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

urlparse

Advertised by the server during the last successful anonymous check.

URL components and query params. args: u. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/urlparse.

urlparse input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

timeconv

Advertised by the server during the last successful anonymous check.

Epoch <-> ISO 8601 UTC. args: t. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/timeconv.

timeconv input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

nip19

Advertised by the server during the last successful anonymous check.

Decode Nostr NIP-19 (npub/note/nprofile/nevent/naddr). args: s. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/nip19.

nip19 input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

bolt11

Advertised by the server during the last successful anonymous check.

Decode a Lightning BOLT11 invoice. args: i. Paid: 0.001 USDC on Base via x402 at https://pennyagent.pythonanywhere.com/paid/bolt11.

bolt11 input schema

{
  "type": "object",
  "additionalProperties": {
    "type": "string"
  }
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 436 ms
95th percentile latency: 436 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 11:40 PM UTC · probe · passed · 436 ms · metadata changed · 8 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http penny-x402-utilities-mcp https://pennyagent.pythonanywhere.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add penny-x402-utilities-mcp --url https://pennyagent.pythonanywhere.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable penny-x402-utilities-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "penny-x402-utilities-mcp": {
      "url": "https://pennyagent.pythonanywhere.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "penny-x402-utilities-mcp": {
      "type": "streamableHttp",
      "url": "https://pennyagent.pythonanywhere.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start penny-x402-utilities-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "penny-x402-utilities-mcp": {
      "type": "http",
      "url": "https://pennyagent.pythonanywhere.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http penny-x402-utilities-mcp https://pennyagent.pythonanywhere.com/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://pennyagent.pythonanywhere.com/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "penny-x402-utilities-mcp": {
      "serverUrl": "https://pennyagent.pythonanywhere.com/mcp"
    }
  }
}

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