CryptoAPIs MCP Signer

MCP server for local transaction signing across EVM, UTXO, Tron, and XRP blockchains — no API calls required

MCP server forlocal transaction signingacross EVM, UTXO, Tron, and XRP blockchains. No Crypto APIs HTTP calls — signing happens entirely on your machine. No API key required.

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

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

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

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

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

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

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

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

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

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

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

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).

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

Blockchain data across 100+ chains: token prices, NFTs, transfers, simulation, traces, Solana DAS

Perform bulk BNB and BEP20 token transfers on the BNB Smart Chain (BSC).

On-chain automated trading strategies (DEX) for AI agents. Create limit orders, range orders, recurring buy-low-sell-high strategies, and concentrated liquidity positions across Ethereum, Sei, Celo, TAC, and COTI. Unlike traditional AMMs and liquidity pools, Carbon lets you set asymmetric price ranges - your buy and sell orders are independent, not mirrored. Backtest any strategy against historical prices before going on-chain, explore market liquidity, find discount entry points, and swap tokens against Carbon DeFi's maker liquidity. 25 tools. Returns unsigned transactions — agents never hold funds or private keys. Zero gas on fills.

Restaking data, operator info, and AVS details on EigenLayer.

Trade on prediction markets from Claude Code. Browse markets, check odds, build and execute trades on-chain.

OTC crypto trading with HTLC atomic settlement on Ethereum and Bitcoin — create trades, lock assets, and settle trustlessly via AI agents

MCP server for Uniswap — swap routing, pool data, and liquidity queries across all supported chains.

Automate token swaps on the Uniswap DEX across multiple blockchains.

Server-side EVM wallet for Ai agents. Send transactions, manage tokens, and interact with smart contracts across multiple chains.

MCP server for Base L2 DeFi operations with 9 monetized endpoints: gas estimates, yield farming, token analysis, contract audit, wallet health, DEX quotes, price feeds, mnemonic generation. Built with FastMCP Python SDK.