Tenzro Ethereum MCP Server

by tenzro Your server? Claim it

not responding

Tenzro Ethereum is listed as active in the registry but did not answer our last check. It exposes 17 tools.

Ethereum tools over MCP: Chainlink feeds, ENS, ERC-8004 agents, EAS attestations, transactions.

Uptime history 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 90 checks

Tools

read from the server

328 ms

Response time

average over 24h

open, no key

Access

streamable-http

Tenzro Ethereum does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add tenzro-ethereum --transport http https://ethereum-mcp.tenzro.xyz/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "tenzro-ethereum": {
      "url": "https://ethereum-mcp.tenzro.xyz/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.tenzro-ethereum]
url = "https://ethereum-mcp.tenzro.xyz/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "tenzro-ethereum": {
      "url": "https://ethereum-mcp.tenzro.xyz/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "tenzro-ethereum": {
      "url": "https://ethereum-mcp.tenzro.xyz/mcp"
    }
  }
}

Available tools 17

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

eth

eth_call_contract

Execute a read-only eth_call against a smart contract. Params: to (contract address), data (hex-encoded calldata), block (default 'latest'). Returns the raw hex result. Use eth_encode_function to build calldata from a function signature and arguments.

eth_encode_function

ABI-encode a function call. Computes the 4-byte selector from the canonical function signature via Keccak-256, then left-pads each argument to 32 bytes. Returns the complete hex-encoded calldata ready for eth_call or a transaction. Example: function_sig='transfer(address,uint256)', args=['0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045', '0xde0b6b3a7640000'].

eth_estimate_gas

Estimate gas required for a transaction via eth_estimateGas. Params: to (required), from/data/value (optional). Returns estimated gas in decimal and hex.

eth_get_attestation

Query an attestation from Ethereum Attestation Service (EAS) by UID. Posts a GraphQL query to the EAS indexer at easscan.org. Returns attester, recipient, schema, data, timestamp, revocation status, and decoded data when available.

eth_get_balance

Get the ETH balance of an address via eth_getBalance. Returns balance in wei, Gwei, and ETH.

eth_get_block

Get block by number via eth_getBlockByNumber. Params: block_number (hex or 'latest'), full_transactions (bool, default false). Returns block header, transactions, and metadata.

eth_get_fee_history

Get fee history for recent blocks via eth_feeHistory. Returns base fees per gas, gas used ratios, and reward percentiles for EIP-1559 gas estimation.

eth_get_gas_price

Get the current gas price from the Ethereum network via eth_gasPrice JSON-RPC. Returns the gas price in wei, Gwei, and hex.

eth_get_price

Get token price from a Chainlink AggregatorV3Interface data feed via eth_call to latestRoundData(). Default feed: ETH/USD on mainnet (0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419). Returns price with 8 decimal precision, round ID, and update timestamps.

eth_get_token_balance

Get ERC-20 token balance for an address via eth_call to balanceOf(address). Params: token_address (ERC-20 contract), owner_address. Returns raw balance (caller must divide by 10^decimals for human-readable amount).

eth_get_transaction

Get transaction details by hash via eth_getTransactionByHash. Returns sender, recipient, value, gas, input data, block number, and nonce.

eth_get_transaction_receipt

Get transaction receipt by hash via eth_getTransactionReceipt. Returns status (0x0=failure, 0x1=success), gas used, logs, contract address (if deployment), and block info.

eth_lookup_agent_8004

Look up an AI agent in the ERC-8004 Agent Registry by agent ID (uint256) or owner address. Builds the calldata for getAgent(uint256) or getAgentsByOwner(address) that can be used with eth_call_contract against a deployed ERC-8004 registry.

eth_lookup_ens

Reverse-lookup an Ethereum address to its ENS name via the Universal Resolver on-chain. Constructs <address>.addr.reverse and calls resolve(). Falls back to OnchainKit ENS API. Params: address (hex).

eth_register_agent_8004

Build transaction data for registering an AI agent via ERC-8004 Agent Registry. ERC-8004 defines an on-chain registry for autonomous AI agents with capabilities, metadata URI, and owner tracking. Returns the ABI-encoded function selector and parameter breakdown for registerAgent(string,string[],string). The caller must sign and submit the transaction to the registry contract.

eth_resolve_ens

Resolve an ENS name to an Ethereum address. Tries the ENS Universal Resolver on-chain via eth_call (resolve(bytes,bytes) at 0xc0497E381f536Be9ce14B0dD3817cBcAe57d2F62). Falls back to the OnchainKit ENS API as a secondary source. Params: name (e.g. 'vitalik.eth').

eth_send_raw_transaction

Broadcast a pre-signed Ethereum transaction via eth_sendRawTransaction. Params: raw_tx (hex-encoded RLP-signed transaction, with or without 0x prefix). Returns the resulting transaction hash as plain text. Use eth_encode_function + eth_estimate_gas + an external signer (or tenzro_signTransaction with chain_id matching the target EVM chain) to build the raw_tx.

Endpoints

URL	Transport	State	Latency	Checked
https://ethereum-mcp.tenzro.xyz/mcp	streamable-http	answering	328 ms	14 min ago

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Tenzro Ethereum — questions

Answers built from our own checks of this server.

What can Tenzro Ethereum do?

It exposes 17 tools, read directly from the server on our last check. Among them: eth_call_contract, eth_encode_function, eth_estimate_gas, eth_get_attestation, eth_get_balance, eth_get_block and 11 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Tenzro Ethereum working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 90 checks got a reply (0.0%), average response time 328 ms. The bar chart above shows every period we have measured.

The registry lists Tenzro Ethereum as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Tenzro Ethereum?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Tenzro Ethereum need an API key?

No. Tenzro Ethereum completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 17 of them are readable on this page. This is what we observed, not what the docs claim.