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MCP server for dry-run EVM transaction simulation via Crypto APIs
About
MCP server for dry-run EVM transaction simulation via Crypto APIs
Security Report
10.0
Low Risk10.0Low RiskValid MCP server (2 strong, 3 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry. Trust signals: trusted author (14/14 approved).
12 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
What You'll Need
Set these up before or after installing:
Crypto APIs API keyRequired
Environment variable: CRYPTOAPIS_API_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-cryptoapis-io-mcp-simulate": {
"env": {
"CRYPTOAPIS_API_KEY": "your-cryptoapis-api-key-here"
},
"args": [
"-y",
"@cryptoapis-io/mcp-simulate"
],
"command": "npx"
}
}
}Getting Started
Once installed, try these example prompts and explore these capabilities:
- 1"Simulate sending 1 ETH from 0xABC to 0xDEF on Ethereum mainnet"
- 2"What gas will this contract call use on Polygon?"
- 3"Dry-run this EVM transaction before I broadcast it"
- 4Tool: simulate_evm — Simulates an EVM transaction dry-run, returning gas usage, state changes, and result
Documentation
View on GitHubFrom the project's GitHub README.
@cryptoapis-io/mcp-simulate
MCP server for Crypto APIs Simulate product. Dry-run EVM transactions to preview results without broadcasting.
API Version: Compatible with Crypto APIs version 2024-12-12
Features
- Simulate EVM transactions before broadcasting
- Preview transaction results, gas usage, and state changes
- Supports all EVM-compatible blockchains (Ethereum, Ethereum Classic, BSC, Polygon, Avalanche (C-Chain), Arbitrum, Base, Optimism, Tron)
Prerequisites
- Node.js 18+
- Crypto APIs account and API key (sign up | get API key)
Installation
npm install @cryptoapis-io/mcp-simulate
Or install all Crypto APIs MCP servers: npm install @cryptoapis-io/mcp
Usage
# Run with API key
npx @cryptoapis-io/mcp-simulate --api-key YOUR_API_KEY
# Or use environment variable
export CRYPTOAPIS_API_KEY=YOUR_API_KEY
npx @cryptoapis-io/mcp-simulate
# HTTP transport
npx @cryptoapis-io/mcp-simulate --transport http --port 3000 --api-key YOUR_API_KEY
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-simulate": {
"command": "npx",
"args": ["-y", "@cryptoapis-io/mcp-simulate"],
"env": {
"CRYPTOAPIS_API_KEY": "your_api_key_here"
}
}
}
}
Cursor
Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):
{
"mcpServers": {
"cryptoapis-simulate": {
"command": "npx",
"args": ["-y", "@cryptoapis-io/mcp-simulate"],
"env": {
"CRYPTOAPIS_API_KEY": "your_api_key_here"
}
}
}
}
MCP Inspector
npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-simulate --api-key YOUR_API_KEY
n8n
- Start the server in HTTP mode:
npx @cryptoapis-io/mcp-simulate --transport http --port 3000 --api-key YOUR_API_KEY - In your n8n workflow, add an AI Agent node
- Under Tools, add an MCP Client Tool and set the URL to
http://localhost:3000/mcp
All servers default to port 3000. Use
--portto assign different ports when running multiple servers.
Available Tools
simulate_evm
Simulate an EVM transaction (dry run).
| Parameter | Description |
|---|---|
blockchain | Target blockchain (ethereum, binance-smart-chain, polygon, etc.) |
network | Network (mainnet, sepolia, testnet, etc.) |
fromAddress | Sender address |
toAddress | Recipient address |
value | Amount to send (in native coin) |
data | Contract call data (hex) |
gasLimit | Gas limit |
gasPrice | Gas price |
CLI Arguments
| Argument | Description | Default |
|---|---|---|
--api-key | Crypto APIs API key | CRYPTOAPIS_API_KEY env var |
--transport | Transport type: stdio or http | stdio |
--host | HTTP host | 0.0.0.0 |
--port | HTTP port | 3000 |
--path | HTTP path | /mcp |
--stateless | Enable stateless HTTP mode | false |
HTTP API Key Modes
When using HTTP transport, the server supports two API key modes:
- With
--api-key: The key is used for all requests.x-api-keyrequest headers are ignored. - Without
--api-key: Each request must include anx-api-keyheader with a valid Crypto APIs key. This enables hosting a public server where each user provides their own key.
# Per-request key mode (multi-tenant)
npx @cryptoapis-io/mcp-simulate --transport http --port 3000
# Clients send x-api-key header with each request
Stdio transport always requires an API key at startup.
Important: API Key Required
Warning: Making requests without a valid API key — or with an incorrect one — may result in your IP being banned from the Crypto APIs ecosystem. Always ensure a valid API key is configured before starting any server.
Remote MCP Server
Crypto APIs provides an official remote MCP server with all tools available via HTTP Streamable transport at https://ai.cryptoapis.io/mcp. Pass your API key via the x-api-key header — no installation required.
License
MIT
Reviews
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Version History
v0.2.3Mar 5, 2026Re-scanned
Added HTTP transport support and per-request API key mode for multi-tenant deployments.
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