sim-api-mcp
Sim API MCP (Model Context Protocol) Tools to power wallets and onchain apps with fast, reliable access to real-time blockchain activity and ownership data. Access data from 60+ chains with a single request.
Install / Use
claude mcp add duneanalytics -- npx -y github:duneanalytics/sim-api-mcpIf the server publishes to npm under a different name, use that package instead — check the repo README.
MCP Server
Model Context Protocol server
Quality Score
Category
Development & EngineeringSupported Platforms
Our assessment of sim-api-mcp
sim-api-mcp scores 62/100 on our quality scale, 738th of 1,340 Development & Engineering skills we index.
Its MCP Server is 1.8 KB long, well organised into 13 sections with 6 code examples: moderately detailed.
It has 3 GitHub stars, so there is little community track record yet; judge it on its content.
Maintenance, license and trust
- The repository was last updated about 16 months ago. Expect some instructions to reference tool versions or APIs that have since changed.
- Our last check on 2026-09-02 found the source still online.
- No license is declared. By default that means all rights are reserved: you can read it, but reusing or redistributing it is not clearly permitted. Ask the author before building on it commercially.
- Its trust signals score 68/100, with 3 cautions from licensing, adoption, age or documentation. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
Safety scan
No issues foundOur scan of the whole file found no instruction hijacking, hidden characters, credential access, data exfiltration or destructive commands.
Automated pattern scan on 2026-09-24. It catches known dangerous patterns, not every risk — read a skill before letting an agent act on it.
sim-api-mcp compared with similar skills
All 4 of these similar skills score higher than sim-api-mcp; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| sim-api-mcp (this skill)by duneanalytics | 62 | 3 | 16mo ago | MCP Server |
| Agent-Reachby Panniantong | 100 | 85.2k | 8d ago | CLAUDE.md |
| headroomby headroomlabs-ai | 100 | 73.7k | today | CLAUDE.md |
| rufloby ruvnet | 100 | 73.2k | today | CLAUDE.md |
| CowAgentby zhayujie | 100 | 47.1k | today | CLAUDE.md |
Frequently asked questions
- How do I install sim-api-mcp?
- Run
claude mcp add duneanalytics -- npx -y github:duneanalytics/sim-api-mcp. The install tabs above show the steps for each supported agent. - Which AI agents does sim-api-mcp work with?
- It is written for Claude Code and Claude Desktop, as a MCP Server file. Other agents that read the same format can often use it too.
- Is sim-api-mcp safe to use?
- Our scan of the whole file found no instruction hijacking, hidden characters, credential access, data exfiltration or destructive commands. It declares no license and scores 68/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is sim-api-mcp still maintained?
- The repository was last updated about 16 months ago. Expect some instructions to reference tool versions or APIs that have since changed.
Skill content
View source on GitHubSim API MCP Server
MCP (Model Context Protocol) server for Sim blockchain APIs, providing access to EVM and SVM transaction data, balances, and token information.
📦 This project uses pnpm as the package manager
Installation
# Clone and install
git clone https://github.com/duneanalytics/sim-api-mcp.git
cd sim-api-mcp
pnpm install
Setup
-
Get your Sim API key from Sim API Console
-
Set environment variable:
export SIM_API_KEY=your_api_key_here
- Start the server:
pnpm run start
Usage with Claude Desktop
First, start the server locally:
pnpm run start
Then add to your Claude Desktop MCP configuration:
{
"mcpServers": {
"sim-api": {
"command": "npx",
"args": [
"mcp-remote",
"http://localhost:3000/mcp"
],
"timeout": 30000,
"reconnectDelay": 5000,
"env": {
"SIM_API_KEY": "YOUR_KEY"
}
}
}
}
Available Tools
EVM Tools
getBalances- Get token balances for EVM wallet addressesgetEVMTransactions- Get transaction history for EVM addressesgetTokenPrice- Get current USD prices for EVM tokenslistSupportedChainsTransactions- List supported chains for transactionslistSupportedChainsTokenBalances- List supported chains for balances
SVM Tools
getSVMBalances- Get token balances for Solana wallet addressesgetSVMTransactions- Get transaction history for Solana addresses
Development
Note: This project uses pnpm for package management
# Clone and install
git clone <repo-url>
cd sim-api-mcp
pnpm install
# Start development server
pnpm run dev
# Run tests
pnpm test
API Reference
Server runs on port 3000 by default. MCP endpoint: http://localhost:3000/mcp with Streamable HTTP
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Languages
Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.