MCP Signer

Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/cryptoapis-io-mcp-signer

About

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Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Nov 1, 2026.

Tools

0 read · 7 write · 0 delete

Secrets

None asked for

Install scripts

None found

Runs as

Node.js package

Tools (7)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

• evm_sign

  Sign an EVM transaction or EIP-712 typed-data message. Three actions: (1) sign-unsigned-hex: sign pre-built unsigned tx hex; (2) sign-from-details: build and sign from fields (blockchain, network, toAddress, value, gas, fee, etc.); (3) sign-typed-data: sign an EIP-712 typed-data message — the x402 GASLESS path, e.g. the EIP-3009 TransferWithAuthorization returned by the x402 buyer /authorize (scheme eip712). For (3) pass domain/types/primaryType/message verbatim; it returns a 65-byte signature (no tx built). Network names (e.g. ethereum+sepolia, polygon+mainnet) are mapped to chainId internall…

• kaspa_sign

  Sign a Kaspa (native KAS) transaction locally. Kaspa is a UTXO/blockDAG chain (schnorr signatures, mainnet only). Action sign-from-details: sign from a prepared transaction object (data.item from the Kaspa prepare-transaction API) — each input carries its prevout script + sompi. Returns the signed tx as JSON (the form the Kaspa broadcast service expects). Private keys (one per input) are passed as parameters (never from env). SECURITY: Private keys may be logged by MCP clients or stored in conversation history — use only in trusted local environments.

• svm_sign

  Partial-sign a Solana (SVM) x402 payment transaction locally (@solana/web3.js). One action: partial-sign — deserialize the base64 UNSIGNED TransferChecked tx from the x402 buyer /authorize (scheme svm-transaction), add ONLY the source-authority (buyer) signature, and re-serialize to base64. The feePayer slot stays UNSIGNED — the facilitator signs it at settle. Returns { transaction } (base64). Secret key is base58, passed as parameter (never from env). SECURITY: keys may be logged by MCP clients or stored in conversation history — use only in trusted local environments.

• tezos_sign

  Sign a Tezos operation locally for tz1 (ed25519), tz2 (secp256k1) or tz3 (P-256) keys. Action sign-forged-operation: pass the `forgedOperation` hex from prepare_transactions_tezos and the secret key (edsk…/spsk…/p2sk…). Before signing, the operation is decoded and checked: only reveal/transaction ops from the key's own address are signed, and `expected` (destination, amount in mutez, maxFee) must match — always pass what the user asked for. Returns signedOperation (hex to broadcast with broadcast_signed_transaction), operationHash (o…), signature and the decoded contents. SECURITY: Private key…

• tron_sign

  Sign a Tron transaction (no TronWeb): Node crypto (sha256) + elliptic (secp256k1) + minimal protobuf encode/decode. Two actions: (1) sign-from-details: sign from transaction object (must include raw_data_hex); (2) sign-unsigned-hex: sign from raw unsigned tx hex. Returns signedTransactionHex. Private key is passed as parameter (never from env). SECURITY: Private keys may be logged by MCP clients or stored in conversation history — use only in trusted local environments.

• utxo_sign

  Sign a UTXO transaction (bitcoin, bitcoin-cash, litecoin, dogecoin, dash, zcash). Two actions: (1) sign-from-details: sign from prepared transaction object (e.g. HD wallet prepare-transaction); (2) sign-unsigned-hex: sign from raw unsigned tx hex (provide inputs metadata: script, satoshis per input). Private key is passed as parameter (never from env). SECURITY: Private keys may be logged by MCP clients or stored in conversation history — use only in trusted local environments.

• xrp_sign

  Sign an XRP (Ripple) transaction. Two actions: (1) sign-from-details: sign from transaction object (JSON); (2) sign-unsigned-hex: sign from raw unsigned tx hex (XRPL serialized). Returns signedTransactionHex and signedTransactionHash. Secret is passed as parameter (never from env). SECURITY: Private keys may be logged by MCP clients or stored in conversation history — use only in trusted local environments.

Signals

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Weekly downloads

77

Last commit

Sep 28, 2026 (1 month ago)

Last release

Sep 24, 2026 (1 month ago)

Last package publish

Sep 24, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Registry name

io.github.CryptoAPIs-io/mcp-signer

Version

0.5.0

Auth

No auth

Packages

npm @cryptoapis-io/mcp-signer

License

MIT

Repository

github.com/CryptoAPIs-io/cryptoapis-mcp-signer

First seen

Oct 24, 2026

Last checked

Nov 1, 2026

Source

Official MCP Registrygithub-graphql