Yes, Chain Data is free to use.

How do I install Chain Data?

Chain Data is a local plugin. Install it using npm package: chain-data-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What AI apps work with Chain Data?

Chain Data uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Chain Data MCP Server

by Baneado98

Developer ToolsUse Caution4.8MCP RegistryLocal

Free

Server data from the Official MCP Registry

Live multi-chain on-chain data: wallet portfolio, token info, gas and prices. MCP + x402.

About

Live multi-chain on-chain data: wallet portfolio, token info, gas and prices. MCP + x402.

Security Report

4.8

Use Caution4.8High Risk

chain-data is a well-architected MCP server for multi-chain on-chain data aggregation. The codebase demonstrates solid security practices: no hardcoded credentials, safe handling of public RPC calls, proper input validation, and appropriate use of third-party libraries. Permissions are well-scoped to the server's purpose (network access for public RPCs and price feeds, environment variables for optional payment configuration). Minor code quality observations exist but do not materially impact security. Supply chain analysis found 4 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

6 files analyzed · 9 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Check that this permission is expected for this type of plugin.

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-baneado98-chain-data": {
      "args": [
        "-y",
        "chain-data-mcp"
      ],
      "command": "npx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

chain-data 🔗

Live multi-chain on-chain data, aggregated in ONE call — built for AI agents.

Give it a wallet and get its whole portfolio across Ethereum, Base, Polygon, Arbitrum and Optimism — native balances + top ERC-20 holdings, each priced in USD — in a single response. Plus token/contract facts, live gas and prices. All read straight from public RPCs and DefiLlama; no API key, no node.

Available as an MCP server (free) and a pay-per-call x402 API ($0.10 USDC on Base, no sign-up).

Why

An agent that wants a wallet's multi-chain net worth would otherwise have to: fan out N JSON-RPC calls to N chains → ABI-encode balanceOf/decimals/symbol → batch them → join against a price feed → repeat per chain. chain-data does all of that server-side and returns one fresh JSON object per call. That convenience on live data is the point — agents pay for the aggregation, not for a static answer they could cache.

Tools (MCP)

Tool	What it does
`wallet_portfolio`	Native + ERC-20 balances with live USD value, across 5 chains, in one call
`token_info`	symbol, name, decimals, total supply, is-contract, EIP-1967 proxy + implementation, price
`gas_prices`	base fee / gas price / priority fee / latest block, per chain or all at once
`token_price`	live USD price by `chain`+`address`, CoinGecko id, or symbol

Use as an MCP server (free)

{
  "mcpServers": {
    "chain-data": { "command": "npx", "args": ["-y", "chain-data-mcp"] }
  }
}

Or over HTTP: POST https://chain-data.vercel.app/mcp.

Free HTTP API

GET /portfolio?wallet=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
GET /token?chain=base&address=0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
GET /gas
GET /price?chain=ethereum&address=0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2

Rate-limited to 30 requests/hour/IP.

Pay-per-call (x402)

The /pro/* routes are gated by x402. Your agent pays $0.10 USDC per call automatically — no sign-up, no API key. Settles on-chain (Base) to the operator wallet. No rate limit.

GET /pro/portfolio?wallet=0x...
GET /pro/token?chain=base&address=0x...
GET /pro/gas
GET /pro/price?chain=ethereum&address=0x...

Supported chains

Ethereum · Base · Polygon · Arbitrum One · OP Mainnet — all via public, key-free RPCs with automatic failover.

Data sources

Balances / token info / gas: public JSON-RPC endpoints (mainnet.base.org, eth.llamarpc.com, polygon-rpc.com, …).
Prices: DefiLlama coins API (free) / CoinGecko ids.

No credentials are stored or required. The server holds no private key — payTo is a public receiving address only.

Local dev

npm install
npm run build
npm run test:engine     # live smoke test against real RPCs
npm run dev:http        # local HTTP server on :8080 (payments off unless X402_* set)
npm run dev:mcp         # local stdio MCP server

License

MIT

Reviews

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Chain Data MCP Server

About

Security Report

Findings (9)Action required

Permissions Required

How to Install

Documentation

chain-data 🔗

Why

Tools (MCP)

Use as an MCP server (free)

Free HTTP API

Pay-per-call (x402)

Supported chains

Data sources

Local dev

License

Reviews

No reviews yet

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