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web3-wallet-relay

v3.2.0

Published

Browser wallet signing relay for web3-tools-mcp — runs embedded or on a host

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Links

Git

Maintainers

hajnalbenhajnalben

Keywords

ethereumwalletwebsocketeip-1193

Readme

web3-wallet-relay

The browser signing page for web3-tools-mcp, and the WebSocket rendezvous behind it. The MCP server sends a transaction, the page shows what it does, and your wallet extension signs it — the relay only passes messages between the two and holds no keys.

You normally never install this. The MCP server embeds it and starts one on localhost when a transaction needs signing.

Install it separately only to host the page, so a machine without a browser can still have something signed. It depends only on express and ws, so it runs anywhere that keeps a Node process alive and supports WebSockets.

WALLET_TOKEN=<long random string> \
WALLET_PUBLIC_URL=https://wallet.example.com \
npx web3-wallet-relay

Then point the MCP server at it with WALLET_SERVER_URL and the same WALLET_TOKEN.

Run the relay at the same version as that server — npx [email protected] for web3-tools-mcp 3.2.0. The two share a version number because they share a protocol, and a mismatched pair cannot pair at all.

The pairing link carries a token derived from WALLET_TOKEN that can only answer signing requests, not make them. Sharing a pairing link is therefore not the same as sharing WALLET_TOKEN — but whoever has it can act as your wallet page, so a signing request can reach them instead of you.

| Variable | | | --- | --- | | WALLET_TOKEN | The MCP server's secret. Anyone holding it can send your browser a transaction to sign — treat it like a password, and serve over HTTPS. Generated per run if unset. The signing page gets a separate token derived from this one, which may only answer requests; that is what pairing links carry. | | PORT | Provided by most hosts. Set, the relay binds 0.0.0.0 and takes that one port; unset, it binds loopback and scans 3456-3460. | | HOST | Override the bind address. | | WALLET_PUBLIC_URL | The URL to print in pairing links, when it differs from the bind address. |

It is also usable as a library — WalletRelay, plus the TransactionRequest and TransactionResponse types.

Part of the web3-tools-mcp repo, where the full documentation lives.

MIT