Shinjuku Shield
Private x402 payments on Solana: shield, pay, and unshield USDC under caps you set.
Install
registry version 0.3.131
npm
npx -y shinjuku-shieldnpm
npx -y shinjuku-shield@0.3.131
Setup by client
Pick your client — the config below is generated for this server (local stdio). Copy respects the “Pin version” switch above.
claude_desktop_config.json
{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield@0.3.131"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}Format verified against the official Claude Desktop docs ↗.
terminal
claude mcp add --env SHIELDED_WALLET_PASSPHRASE=<YOUR_SHIELDED_WALLET_PASSPHRASE> shinjuku-mcp -- npx -y shinjuku-shield
claude mcp add --env SHIELDED_WALLET_PASSPHRASE=<YOUR_SHIELDED_WALLET_PASSPHRASE> shinjuku-mcp -- npx -y shinjuku-shield@0.3.131
Format verified against the official Claude Code docs ↗.
.cursor/mcp.json
{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield@0.3.131"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}Format verified against the official Cursor docs ↗.
.vscode/mcp.json
{
"servers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}{
"servers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield@0.3.131"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}Format verified against the official VS Code docs ↗.
mcp_config.json
{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}{
"mcpServers": {
"shinjuku-mcp": {
"command": "npx",
"args": [
"-y",
"shinjuku-shield@0.3.131"
],
"env": {
"SHIELDED_WALLET_PASSPHRASE": "<YOUR_SHIELDED_WALLET_PASSPHRASE>"
}
}
}
}Format verified against the official Windsurf docs ↗.
Environment variables
Defined in the server's official registry manifest. Required secrets are shown as <YOUR_…> placeholders in the configs above.
SHIELDED_WALLET_HOME— The private folder that holds the encrypted wallet and config.json. Default: ~/.carbon-shielded-wallet (the folder that setup uses).SHIELDED_WALLET_PASSPHRASEsecret — The wallet passphrase, if you do not use --passphrase-file.
About this server
Distributed as npm, listed under Developer Tools. Review our MCP security guide before granting access to real data.
Frequently asked questions
How do I install Shinjuku Shield?
Run the install command shown above, then paste the config for your client (Claude Desktop, Claude Code, Cursor, VS Code or Windsurf) into its MCP settings and restart the client.
Is Shinjuku Shield free to use?
The MCP server itself is free to install. The source is public on https://github.com/ShinjukuStaition/shinjuku-shield. Any third-party service it calls may require its own API key and account.
Which clients support Shinjuku Shield?
Any MCP-compatible client can use it, including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf and custom agents.
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