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Shinjuku Shield MCP server

by ShinjukuStaition·io.github.ShinjukuStaition/shinjuku-mcp·v0.3.131·2 stars
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Private x402 payments on Solana: shield, pay, and unshield USDC under caps you set.

B82/100grade B
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B82/100

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2 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Shinjuku Shield tools

No tool declarations could be read from the package source. They show once the server is installed.

Not scanned yet. New listings are scanned within a day or two of arriving.

How Shinjuku Shield compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
82/100
higher than 63% of 48,255 servers
GitHub stars
2
more than 75% of 28,688 servers

Release history: 15 versions in the registry since 2026-10-08, latest 2026-10-30, typically several a day.

Install Shinjuku Shield in Claude Code, Cursor or VS Code

Runs npx -y shinjuku-shield on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add shinjuku-mcp -- npx -y shinjuku-shield
Add to Cursor

What the publisher says

From the Shinjuku Shield repository's README, as published. We do not edit it. Read it on GitHub

Shinjuku Shielded MCP

The private x402 facilitator, inside your agent.

Shinjuku Shielded settles x402 payments from a shielded USDC balance on Solana: on chain, a shielded payment does not show who paid. This MCP server is how your agent uses it. It runs on your machine, under caps that only you set.

it. We never run it, and we never hold your money.

  • Self-custody. The server runs on your machine. Your keys never leave

and no server sees your IP.

  • Shielded payments. Your agent pays from a shielded balance. Add --tor

setup on a machine with no wallet. It makes the wallet, a private passphrase file, and the checked proof tools.

  • One command to set up. npx -y shinjuku-shielded mcp offers the

payment, 1 USDC per session). A tool call can only lower them, never raise them.

  • Caps that only you set. Setup records them (default: 0.05 USDC per

(Coinbase x402 Bazaar, PayAI, Dexter, and others) on your machine.

  • Find sellers. x402_discover searches public x402 listings

caps allow it. It pays nothing.

  • Look before you pay. x402_preview shows the price and whether your

pays the network fee.

  • No SOL. wallet_shield needs only USDC. Our facilitator's relayer

payment, deposit, or unshield. It never starts a second one.

  • Never twice. A retry with the same request_id resumes the same

Your own RPC always wins if you give one.

  • No RPC, no account, no API key. Reads go through our relay by default.

Every Shinjuku Shielded service joins this MCP as it ships.

The server is the mcp command of shinjuku-wallet, one file. This repository holds the setup guide and examples. The wallet file, its SHA-256, and its release history are in ShinjukuStaition/shinjuku-shielded.

Talk to it in plain words

Ask your agent the way you would ask a person:

Each answer tells the agent the exact next call. The wallet reads the chain and writes an encrypted backup by itself, so you never run a command for upkeep.

Tools

SETUP

On a machine with no wallet, the server starts in setup mode.

In setup mode, every money tool answers walletnotset_up and does nothing.

SHIELD

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Shinjuku Shield: common questions

Is Shinjuku Shield MCP server safe?
Mostly: it is graded B (82/100). Read the Shinjuku Shield safety report
How do I install Shinjuku Shield?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Shinjuku Shield need an API key?
Yes. The registry entry asks for SHIELDED_WALLET_PASSPHRASE.
Is Shinjuku Shield maintained?
The last commit was 27 days ago (2026-10-08). The latest release is v0.3.131.
How does Shinjuku Shield compare with other MCP servers?
safety score 82/100 (higher than 63% of 48,255 servers); github stars 2 (more than 75% of 28,688 servers). Full comparison.