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Blockchain JSON-RPC on 23 EVM chains for AI agents - free tier, API key, or x402 pay-per-call.
About
Blockchain JSON-RPC on 23 EVM chains for AI agents - free tier, API key, or x402 pay-per-call.
Security Report
4.8
Use Caution4.8High RiskA well-designed blockchain RPC MCP server with proper authentication tiering (public, API key, and x402 pay-per-call). Code is clean with good input validation via Zod schemas and appropriate error handling. The x402 wallet key handling is secure (environment variable only, not logged), and sensitive operations are properly gated behind authentication. Permissions align well with the stated purpose of blockchain data access across 23 EVM chains. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
3 files analyzed · 7 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.
What You'll Need
Set these up before or after installing:
Optional NodeFlare API key (free at nodeflare.app) — unlocks heavy methods and higher limitsRequired
Environment variable: NODEFLARE_API_KEY
Optional EVM private key of a wallet holding USDC on Base/Polygon/Arbitrum — heavy methods are paid per call (~$0.001) via x402Required
Environment variable: X402_PRIVATE_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-nodeflare-app-nodeflare-mcp": {
"env": {
"X402_PRIVATE_KEY": "your-x402-private-key-here",
"NODEFLARE_API_KEY": "your-nodeflare-api-key-here"
},
"args": [
"-y",
"nodeflare-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
NodeFlare MCP Server
Blockchain JSON-RPC for AI agents on 23 EVM chains — Ethereum, Base, BNB Chain, Arbitrum, Optimism, Avalanche, HyperEVM, Polygon, and young chains like Robinhood Chain, Plasma, Ink, Zircuit, BOB and Soneium. Served from NodeFlare's own bare-metal nodes across 5 regions.
Quick start
{
"mcpServers": {
"nodeflare": {
"command": "npx",
"args": ["-y", "nodeflare-mcp"]
}
}
}
That's it — no API key required for standard reads (block numbers, balances, transactions, eth_call).
Install as a Claude Code plugin
This repo doubles as a Claude Code plugin marketplace. Installing the plugin wires up the MCP server and a set of slash-command recipes in one step:
claude plugin marketplace add Nodeflare-app/nodeflare-mcp
claude plugin install nodeflare
Then use the recipes below (/nodeflare:balance, /nodeflare:token, …). To unlock heavy methods, export NODEFLARE_API_KEY in your shell before starting Claude Code (free key, 3M CU/month).
Recipes
Ready-made slash commands bundled with the plugin:
| Recipe | What it does |
|---|---|
/nodeflare:chains [filter] | List supported chains, IDs and endpoint URLs |
/nodeflare:balance <address> [chain] [token…] | Native + ERC-20 balances, one chain or across the majors |
/nodeflare:token <token> [chain] [holder] | ERC-20 metadata (name/symbol/decimals/supply) + optional holder balance |
/nodeflare:tx <hash> [chain] | Fetch a transaction + receipt and explain what it did |
/nodeflare:logs <contract> [chain] [from] [to] | Fetch and summarise a contract's recent event logs |
/nodeflare:gas [chain | compare] | Current gas price on a chain, or a cheapest-first comparison |
Access tiers
The server picks its access tier from the environment:
| Env var | Tier |
|---|---|
| (none) | Free public endpoints — standard read methods, rate-limited per IP |
NODEFLARE_API_KEY | Free/paid key — heavy methods, 3,000,000 compute units/month free (get one) |
X402_PRIVATE_KEY | Pay per call with x402 — heavy methods (eth_getLogs, trace_*, debug_*) are paid from this wallet in USDC on Base, Polygon or Arbitrum, ~$0.001/call. No account needed; gas is covered by the facilitator. |
With an x402 wallet, a blocked heavy method is retried automatically as a paid call — the tool result includes "_x402": "settled via x402" when a payment settled on-chain.
{
"mcpServers": {
"nodeflare": {
"command": "npx",
"args": ["-y", "nodeflare-mcp"],
"env": { "X402_PRIVATE_KEY": "0x…" }
}
}
}
Use a dedicated agent wallet holding a small USDC balance — never your main wallet.
Tools
| Tool | Description |
|---|---|
list_chains | The 23 supported chains with chain IDs and endpoints |
get_block_number | Latest block number |
get_balance | Native-token balance of an address |
get_transaction_receipt | Transaction receipt by hash |
eth_call | Read-only contract call |
get_logs | Contract event logs (heavy — key or x402 wallet) |
rpc_call | Any JSON-RPC method on any supported chain |
get_transaction | Transaction by hash (from, to, value, input) |
get_block | Block by number/tag, optional full transactions |
get_gas_price | Current gas price + EIP-1559 priority fee |
get_token_balance | ERC-20 balance, raw + human-readable |
get_token_metadata | ERC-20 name, symbol, decimals, total supply |
Links
- NodeFlare — free API key, 3M CU/month
- x402 pay-per-request — pricing and how it works
- Docs · Status · Discord
MIT
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