MCP Signer

MCP server for local transaction signing on EVM, UTXO, Tron, and XRP — no API calls needed

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag — we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

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

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (6)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by MCP Signer.

evm_sign

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

utxo_sign

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

tron_sign

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

xrp_sign

Sign an XRP transaction.

kaspa_sign

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

svm_sign

Partial-sign a Solana (SVM) x402 payment transaction — the buyer's source-authority signature only

Documentation Overview

@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

Terminal

npm install @cryptoapis-io/mcp-signer

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

Usage

Terminal

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):

config.json

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

Cursor

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

config.json

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

MCP Inspector

Terminal

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)
`sign-unsigned-hex`	Sign a raw unsigned transaction hex with input descriptors

`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

Read the full README →View source on GitHub →

Related MCP Servers

View all in Finance & Fintech View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads

654

Package downloads in the last 30 days.

Last commit

1mo ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Directory activity

1 views

Config copies, upvotes, and views on AllMCPs.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about MCP Signer

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mcp-signer": { "command": "npx", "args": ["-y","@cryptoapis-io/mcp-signer"] } }

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Technical Specs & Signals

CategoryFinance & Fintech

16/16 checks healthy over the last 46d

53Quality signal: Good · 53/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity5/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 6d ago via OSV.dev · @cryptoapis-io/mcp-signer (npm)

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More in 💰 Finance & Fintech →Best MCP servers for Finance & Fintech →Alternatives to MCP Signer →Install in Claude Desktop Install in Cursor Install in VS Code Setup guides for all 13 MCP clients

MCP Signer

MCP server for local transaction signing on EVM, UTXO, Tron, and XRP — no API calls needed

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag — we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

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

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (6)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by MCP Signer.

evm_sign

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

utxo_sign

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

tron_sign

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

xrp_sign

Sign an XRP transaction.

kaspa_sign

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

svm_sign

Partial-sign a Solana (SVM) x402 payment transaction — the buyer's source-authority signature only

Documentation Overview

@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

Terminal

npm install @cryptoapis-io/mcp-signer

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

Usage

Terminal

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):

config.json

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

Cursor

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

config.json

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

MCP Inspector

Terminal

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)
`sign-unsigned-hex`	Sign a raw unsigned transaction hex with input descriptors

`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

Read the full README →View source on GitHub →

Related MCP Servers

View all in Finance & Fintech View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads

654

Package downloads in the last 30 days.

Last commit

1mo ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Directory activity

1 views

Config copies, upvotes, and views on AllMCPs.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about MCP Signer

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mcp-signer": { "command": "npx", "args": ["-y","@cryptoapis-io/mcp-signer"] } }

AllMCPs Directory Badge

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Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

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Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/mcp-signer?style=directory)](https://allmcps.com/mcp/mcp-signer)

HTML Embed

<a href="https://allmcps.com/mcp/mcp-signer"><img src="https://allmcps.com/api/badge/mcp-signer?style=directory" alt="MCP Signer on AllMCPs" /></a>

Technical Specs & Signals

CategoryFinance & Fintech

16/16 checks healthy over the last 46d

53Quality signal: Good · 53/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity5/15

Community engagement0/10

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 6d ago via OSV.dev · @cryptoapis-io/mcp-signer (npm)

★ Featured

AllMCPs Server

Explore Server →

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

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Add our SVG badge (dark/light directory styles) or embeddable widget to your site.