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

config.json

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

That's it — no API key required for standard reads (block numbers, balances, transactions, eth_call).

Every tool's chain argument accepts a slug (eth, base, arb), a name (ethereum, arbitrum, bsc), or a numeric chain ID (1, 8453) — so agents don't have to know NodeFlare's internal slugs.

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:

Terminal

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, 2M 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, 2,000,000 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.

config.json

{
  "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 (decimal + hex)
`get_balance`	Native-token balance — raw wei + human-readable amount in the chain's currency
`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
`resolve_ens`	ENS name → address (forward) or address → primary ENS name (reverse)
`get_token_price`	Current USD price of an ERC-20 (DefiLlama, keyless) — price, symbol, confidence
`compare_gas`	Gas price across chains in one call, cheapest first, so an agent picks where to transact
`get_multichain_balances`	Native + ERC-20 balances for one address across many of the 23 chains in one call (incl. young chains); pay-per-call with an x402 wallet
`get_token_allowances`	ERC-20 approvals a wallet has granted across chains, with revoked ones dropped and unlimited approvals flagged (heavy — key or x402)
`get_wallet_report`	Full "know this wallet" report: balances + USD total + top holdings + active approvals, across chains (approvals half is heavy)
`check_token_safety`	Risk-check an ERC-20 before trading: ownership, proxy detection, holder concentration, honeypot simulation → risk score (deep checks heavy)
`simulate_transaction`	Tx pre-flight: will it revert, gas used, and which tokens/ETH move (asset-change tracing is heavy)
`onchain_answer`	Onchain Answer Engine — plain-English question about a wallet/token → a cited verdict in one call (key or x402; no free tier)

Address arguments (get_balance, get_token_balance, eth_call) also accept ENS names — pass vitalik.eth and it's resolved to an address automatically.

get_multichain_balances can also auto-discover the tokens an address holds (discover: true, x402 wallet required). Discovered tokens are USD-priced via DefiLlama and, on price-covered chains, filtered by value: pass minUsd (default 0.01) to set the worthless-token cutoff, includeSpam: true to keep unpriced tokens, or includeDust: true to keep sub-1e-9 balances.

Prompts (any MCP client)

The server also exposes the recipes as MCP prompts, so guided workflows show up in any MCP client (Cursor, Windsurf, …), not just the Claude Code plugin: chains, balance, token, tx, logs, gas.

Nodeflare MCP README