# Crypto APIs Signer

> Use this tool when you need to securely sign blockchain transactions locally, without relying on API calls, to handle private key management and transaction serialization for various blockchain networks, including EVM-compatible chains and UTXO-based networks. It solves problems related to transaction security and privacy by keeping sensitive data on the client side. Ideal for use cases requiring secure, client-side transaction signing, such as cryptocurrency wallets and decentralized applications.

Canonical page: https://skillsregistry.net/skills/cryptoapis-signer  
JSON: https://api.skillsregistry.net/v1/skills/cryptoapis-signer

## Description

Signs blockchain transactions locally without making API calls, supporting EVM-compatible chains, UTXO-based networks, Tron, and XRP. Handles private key management and transaction serialization entirely on the client side. Part of the Crypto APIs suite.

## Trust

- **Trust score (0–1):** 1.00
- **Verification tier:** verified
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-09-19

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/cryptoapis-signer)
- **Repository:** <https://github.com/cryptoapis-io/cryptoapis-mcp-signer>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "cryptoapis-signer"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/cryptoapis-signer` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/cryptoapis-signer/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt