Evmcp

io.github.siriuslatticePublished by GitHub account siriuslatticev0.1.3Updated Oct 24, 2026

Multi-chain EVM blockchain data with companion smart contracts

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Overview

AI-generated overview

Read-only MCP server that gives an assistant 28+ tools to query EVM on-chain data across Base, Optimism, Avalanche, Celo and Arbitrum via Alchemy RPC.

What you can do
  • Read balances: native, ERC20, allowance and multi-chain balance lookups
  • Inspect blocks and transactions: fetch blocks by hash or number, latest block, transactions, receipts and ABI-based decoding
  • Query contracts and tokens: read-only contract calls, bytecode checks, storage slots, ERC20 metadata and event logs
  • Compare gas: current gas prices, gas estimates, cross-chain gas comparison and cheapest-chain recommendations
  • Resolve ENS names and reverse-lookup addresses on Ethereum L1
  • Run batch and cross-chain queries through Multicall3 and companion contracts, plus chain info and RPC health checks
When to use it
Useful when you want an assistant to answer questions about wallets, tokens, contracts, transactions or gas costs on the five supported EVM chains without writing RPC code yourself. It suits read-only research, wallet and contract inspection, and cross-chain comparisons.
Requirements
Runs locally over stdio, typically via npx. Needs an Alchemy API key in ALCHEMY_API_KEY, or individual RPC URL overrides for each chain. Optional settings cover cache TTL, log level, testnets, HTTP transport and x402 payment gating. Network access to the RPC endpoints is required.
Before you install
The Alchemy API key is a billable credential passed in plain environment variables; keep it out of shared configs. Optional x402 settings enable payment gating and require a USDC payee address. Tools are described as read-only, but they send addresses and queries to Alchemy and public RPC endpoints, and the server reads from third-party companion contracts.

Installation

In SourceWeft

  1. Open Evmcp in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

evmcp

EVM + MCP — give your AI assistant blockchain superpowers.

MCP server providing real-time access to on-chain data across Base, Optimism, Avalanche, Celo, and Arbitrum, with companion smart contracts deployed on-chain for batch queries and cross-chain data.

How it Works

EVMCP implements the Model Context Protocol (MCP), a standard that lets AI assistants call external tools. When connected, your AI assistant gains 28 read-only blockchain tools it can invoke to query balances, decode transactions, compare gas prices, and more across five EVM chains.

What sets EVMCP apart is its companion smart contracts — four Solidity contracts deployed on Avalanche and Celo that enable batch queries via Multicall3, an on-chain tool registry, event aggregation, and cross-chain balance caching. The MCP server reads from these contracts; all write operations are performed separately by an admin CLI.

Quick Start

With Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

json
{  "mcpServers": {    "evmcp": {      "command": "npx",      "args": ["-y", "evmcp"],      "env": { "ALCHEMY_API_KEY": "your_key_here" }    }  }}

With Claude Code

bash
claude mcp add evmcp -- npx -y evmcp

Supported Chains

ChainChain IDNative TokenCompanion Contracts
Base8453ETHNot yet deployed
Optimism10ETHNot yet deployed
Avalanche C-Chain43114AVAXDeployed
Celo42220CELODeployed
Arbitrum One42161ETHNot yet deployed

Ethereum mainnet (chain ID 1) is also supported for ENS resolution only.

Tools (29 total)

Balance (3)

ToolDescription
getBalanceGet the native token balance (ETH/AVAX/CELO) of an address on a specific chain
getTokenBalanceGet the ERC20 token balance of an address on a specific chain
getMultiChainBalanceGet the native token balance of an address across all 5 supported chains in parallel

Block (3)

ToolDescription
getBlockGet a block by its hash on a specific chain
getBlockByNumberGet a block by its number on a specific chain, or pass "latest" for the most recent block
getLatestBlockGet the latest block number, timestamp, and base fee for a specific chain

Transaction (3)

ToolDescription
getTransactionGet a transaction by its hash on a specific chain
getTransactionReceiptGet the receipt for a transaction including status, gasUsed, and logs
decodeTransactionDecode a transaction's function call using a provided ABI

Contract (3)

ToolDescription
readContractCall a read-only function on a smart contract with a provided ABI
getContractCodeCheck if an address has contract code deployed, with bytecode length and hash
getStorageAtRead the raw value of a storage slot at a specific address

Token (2)

ToolDescription
getERC20InfoGet ERC20 token metadata including name, symbol, decimals, and total supply
getTokenAllowanceGet the ERC20 token allowance granted by an owner to a spender

Gas (3)

ToolDescription
getGasPriceGet current gas price and EIP-1559 fee data for a specific chain
estimateGasEstimate gas for a transaction on a specific chain
compareGasAcrossChainsCompare current gas prices across all 5 supported chains

ENS (2)

ToolDescription
resolveENSResolve an ENS name (e.g. vitalik.eth) to an Ethereum address via Ethereum L1
lookupAddressReverse lookup an address to its ENS name via Ethereum L1

Events (2)

ToolDescription
getContractEventsGet event logs emitted by a contract on a specific chain
decodeEventLogDecode a raw event log using a provided ABI

Chain and Health (3)

ToolDescription
getChainInfoGet chain name, chain ID, current block number, block time, and native symbol
isContractDeployedCheck if an address has contract code deployed on all 5 supported chains
healthCheckTest connectivity to all 6 RPC endpoints (Ethereum, Base, Optimism, Avalanche, Celo, Arbitrum)

Batch (1)

ToolDescription
batchQueryExecute multiple read calls in a single RPC request using Multicall3

Cross-Chain (2)

ToolDescription
compareBalancesCompare native token balances for an address across all 5 chains
crossChainActivityCheck transaction counts for an address across all 5 chains

Registry (1)

ToolDescription
queryRegistryRead registered tool metadata from the on-chain MCPRegistry companion contract

Optimizer (1)

ToolDescription
gasOptimizerRecommends the cheapest chain for a transaction, accounting for L1 data fees on Base/Optimism/Arbitrum

Resources (4)

URI PatternDescriptionCache TTL
chain://{chainId}/statusCurrent block height and gas price for a chain12s
chain://{chainId}/gasBase fee, gas price, and priority fee in gwei12s
chain://{chainId}/tokens/popularPopular token addresses and decimals (hardcoded for v1)1 hour
evmcp://chainsAll supported chains with IDs, symbols, and companion contract addressesStatic

Supported chain IDs for templated resources: 8453 (Base), 10 (Optimism), 43114 (Avalanche), 42220 (Celo), 42161 (Arbitrum).

Prompts (4)

PromptArgumentsDescription
analyze-walletaddressMulti-chain balance and activity analysis of a wallet
audit-contractcontractAddress, chainBasic inspection and audit workflow for a smart contract
compare-chains(none)Compare gas costs, speed, and characteristics across all chains
investigate-txtxHash, chainDecode, analyze, and trace a transaction in detail

Companion Contracts

Four Solidity contracts are deployed on Avalanche and Celo. The MCP server reads from these contracts to provide batch queries, on-chain tool metadata, and cross-chain data. Base and Optimism deployments are planned.

Avalanche C-Chain (43114)

ContractAddress
MCPRegistry0x62402b65bfb4Fd022285A6FC2F26d8caEEc3D055
BatchQuery0xfDc19e0617AdF1811A68Aa1575409F3769f39491
EventAggregator0xECE24a53A28F088351EC2Da258f78479e81A8007
CrossChainCache0x0899a6Ef23c6B39A4D9B877B219645B89209A670

Celo (42220)

ContractAddress
MCPRegistry0x62402b65bfb4Fd022285A6FC2F26d8caEEc3D055
BatchQuery0xfDc19e0617AdF1811A68Aa1575409F3769f39491
EventAggregator0xECE24a53A28F088351EC2Da258f78479e81A8007
CrossChainCache0x0899a6Ef23c6B39A4D9B877B219645B89209A670

Contract Descriptions

  • MCPRegistry -- On-chain metadata for all EVMCP tools (names, descriptions, versions). Owner-only writes.
  • BatchQuery -- Optimized batch reads via Multicall3. Includes multi-balance, multi-contract-check, and multi-token-balance helpers.
  • EventAggregator -- Caches event count summaries per contract. Updated by the admin CLI.
  • CrossChainCache -- Stores balance snapshots for cross-chain queries. Updated by the admin CLI.

Environment Variables

VariableRequiredDescription
ALCHEMY_API_KEYYes*Alchemy API key (covers all chains)
BASE_RPC_URLNo*Override RPC URL for Base
OPTIMISM_RPC_URLNo*Override RPC URL for Optimism
AVALANCHE_RPC_URLNo*Override RPC URL for Avalanche
CELO_RPC_URLNo*Override RPC URL for Celo
ARBITRUM_RPC_URLNo*Override RPC URL for Arbitrum
ETHEREUM_RPC_URLNoOverride RPC URL for ENS resolution
CACHE_TTL_SECONDSNoCache TTL in seconds (default: 15)
CACHE_MAX_ENTRIESNoMax cache entries (default: 1000)
LOG_LEVELNodebug, info, warn, or error (default: info)
USE_TESTNETSNoUse testnet chains (default: false)

| TRANSPORT | No | stdio (default) or http for Streamable HTTP transport | | HTTP_PORT | No | Port for HTTP transport (default: 3402) | | X402_ENABLED | No | Enable x402 payment gating on HTTP transport | | X402_PAYEE_ADDRESS | No** | USDC receive address on Base | | X402_FACILITATOR_URL | No | x402 facilitator URL (has default) |

*Provide either ALCHEMY_API_KEY or all five individual chain RPC URLs. **Required when X402_ENABLED=true.

Development

bash
pnpm installpnpm buildpnpm inspect          # MCP Inspector UI at localhost:6274pnpm test             # Unit testspnpm typecheck        # Type checkpnpm lint             # ESLint

License

MIT

Source: README.md at commit c23fe49

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.1.3LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts