MCP Signer

Name: MCP Signer
Author: CryptoAPIs-io

by CryptoAPIs-ioversion 0.5.0i★ 0iRuns on your computer

Registry nameio.github.CryptoAPIs-io/mcp-signer

How to install

Overview

Description from the maker (original English)

Local transaction signing for EVM, UTXO, Tron, XRP, Kaspa, Solana and Tezos — no API calls

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Crypto & blockchain

Install

Pick the AI app you use, then copy the settings.

Passed 2/2 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer"
      ]
    }
  }
}

Done

Quit Claude and open it again
Done
Try it
Use MCP Signer and tell me what you can do for me, then show me one thing
✓ If Claude says it is using MCP Signer or shows a MCP Signer tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect MCP Signer yet

MCP Signer runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect MCP Signer

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Crypto & blockchain that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Solana MCP by Vybe✓ ChatGPT
0xinsider✓ ChatGPT
Highwire✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add signer -- npx -y @cryptoapis-io/mcp-signer

Done

Type /mcp in Claude Code
You should see MCP Signer listed as connected
Done
Try it
Use MCP Signer and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using MCP Signer or shows a MCP Signer tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use MCP Signer and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using MCP Signer or shows a MCP Signer tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use MCP Signer and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using MCP Signer or shows a MCP Signer tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use MCP Signer💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add signer -- npx -y @cryptoapis-io/mcp-signer

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "signer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: 222/wk
Licence i: No licence stated
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.5.0
Categoryi: Crypto & blockchain
Published to registryi: Sep 24, 2026
Code last changedi: Oct 28, 2026
Maker: CryptoAPIs-io
Packages: npm: @cryptoapis-io/mcp-signer
Repo: CryptoAPIs-io/cryptoapis-mcp-signer
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account CryptoAPIs-io, which owns the repo
✓ Pass
Still maintained
Code last changed 14 days ago
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1637 servers in this category
Published to the registry more recently than 51% of the other 1637 servers in this category
Basic checks equal to or better than 100% of the other 1637 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP Signer safe?

It passed 2 of 2 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 14 days ago, and the latest version (0.5.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Solana MCP by Vybe, Oracle3 prediction-market arbitrage checks, Polymarket Paper Trader

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Solana MCP by Vybe

Solana MCP developer toolkit: wallets, trades, markets, PnL, transfers, onchain, swaps & API tools.

by vybenetworkWidely used★ 2.6K Stars for the whole repoUpdated 6 months ago

Runs in the cloud

Install

Oracle3 prediction-market arbitrage checks

Kalshi and Polymarket data, venue fees, no-arbitrage checks and paper execution for AI agents.

by YichengYang-EthanGrowing↓ 35/wk★ 568Updated 41 days ago

Runs on your computer

Install

Polymarket Paper Trader

Polymarket paper trading for AI agents: $10k paper money, real order books, official fees.

by agent-nextGrowing↓ 226/wk★ 503Updated 26 days ago

Runs on your computer

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@cryptoapis-io/mcp-signer

MCP server for local transaction signing across EVM, UTXO, Tron, XRP, Kaspa, Solana and Tezos. No Crypto APIs HTTP calls — signing happens entirely on your machine. No API key required.

Security

Stdio only — no HTTP transport. The server does not listen on any port.
Private keys in tool input — each tool receives privateKey / privateKeys / secret as parameters. Keys are never read from environment variables.
No network calls — all signing is done locally using cryptographic libraries.

Installation

npm install @cryptoapis-io/mcp-signer

Or install all Crypto APIs MCP servers: npm install @cryptoapis-io/mcp

Usage

npx @cryptoapis-io/mcp-signer

Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

"mcpServers": { "cryptoapis-signer": { "command": "npx", "args": ["-y", "@cryptoapis-io/mcp-signer"] } } }

Cursor

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

"mcpServers": { "cryptoapis-signer": { "command": "npx", "args": ["-y", "@cryptoapis-io/mcp-signer"] } } }

MCP Inspector

npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-signer

Available Tools

`evm_sign`

Sign an EVM transaction (Ethereum, Ethereum Classic, BSC, Polygon, Avalanche (C-Chain), Arbitrum, Base, Optimism, Tron).

Action	Description
`sign-from-details`	Sign from structured transaction fields (to, value, gasLimit, etc.)
`sign-unsigned-hex`	Sign a pre-built unsigned transaction hex
`sign-typed-data`	Sign an EIP-712 typed-data message (the x402 gasless path — e.g. the EIP-3009 `TransferWithAuthorization` from the x402 buyer `/authorize`). Returns `{ signature }`, not a tx.

`utxo_sign`

Sign a UTXO transaction (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash).

Action	Description
`sign-from-details`	Sign from a prepared transaction object (inputs, outputs). For zcash, produces a v5 (ZIP 225/244) transaction and requires exactly one of `targetHeight` (current chain tip + 1) or `consensusBranchId` (e.g. a node's `getblockchaininfo` `consensus.nextblock`)
`sign-unsigned-hex`	Sign a raw unsigned transaction hex with input descriptors. Does not support zcash

`tron_sign`

Sign a Tron transaction using secp256k1 (no TronWeb dependency).

Action	Description
`sign-from-details`	Sign from a transaction object with `raw_data_hex`
`sign-unsigned-hex`	Sign a pre-built unsigned transaction hex

`xrp_sign`

Sign an XRP transaction.

Action	Description
`sign-from-details`	Sign from structured XRP transaction fields
`sign-unsigned-hex`	Sign a pre-built unsigned transaction hex

`kaspa_sign`

Sign a Kaspa transaction using schnorr (BIP340) via kaspa-wasm. Mainnet only.

Action	Description
`sign-from-details`	Sign a prepared Kaspa transaction (from the prepare-transaction API)

`svm_sign`

Partial-sign a Solana (SVM) x402 payment transaction — the buyer's source-authority signature only (the facilitator's feePayer slot stays unsigned, signed at settle).

Action	Description
`partial-sign`	Deserialize the base64 unsigned TransferChecked tx from the x402 buyer `/authorize` (scheme `svm-transaction`), add the buyer signature, re-serialize to base64. Returns `{ transaction }`.

`tezos_sign`

Sign a Tezos operation for tz1 (ed25519), tz2 (secp256k1) or tz3 (P-256) keys (edsk… / spsk… / p2sk…).

Action	Description
`sign-forged-operation`	Sign the `forgedOperation` hex from `prepare_transactions_tezos`. The operation is decoded first: only reveal/transaction ops from the key's own address are signed, and the optional `expected` (`destination`, `amount` in mutez, `maxFee`) must match. Returns `{ signedOperation, operationHash, signature, … }`; broadcast `signedOperation`.

Most tools return signedTransactionHex — ready to broadcast with @cryptoapis-io/mcp-broadcast. The x402 paths return { signature } (EVM typed-data) or { transaction } (SVM) instead.

Dependencies

Package	Purpose
`ethers`	EVM transaction signing
`bitcoinjs-lib` + `ecpair` + `tiny-secp256k1`	UTXO transaction signing
`elliptic`	Tron transaction signing (secp256k1)
`xrpl`	XRP transaction signing

License

MIT

MCP Signer

Overview

What you can do with it

Install

Install Node.js

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Crypto & blockchaini

Common questions

Alternatives

Solana MCP by Vybe

Oracle3 prediction-market arbitrage checks

Polymarket Paper Trader

README from the maker

@cryptoapis-io/mcp-signer

Security

Installation

Usage

Claude Desktop

Cursor

MCP Inspector

Available Tools

evm_sign

utxo_sign

tron_sign

xrp_sign

kaspa_sign

svm_sign

tezos_sign

Dependencies

License

`evm_sign`

`utxo_sign`

`tron_sign`

`xrp_sign`

`kaspa_sign`

`svm_sign`

`tezos_sign`