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BaseLens MCP Server

by vercel-baselens-api Your server? Claim it
not responding

BaseLens is listed as active in the registry but did not answer our last check. It exposes 11 tools.

Base on-chain data for agents: balances, prices, transfers, Basenames, contracts. x402 pay-per-call.

Uptime history 9 days of history · worst day 32%
9 days agonow
62.6%
Uptime 24h
57 of 91 checks
11
Tools
read from the server
248 ms
Response time
average over 24h
open, no key
Access
streamable-http

BaseLens does not always answer

Over the last week it answered 62.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

run in your terminal
claude mcp add baselens --transport http https://baselens-api.vercel.app/mcp
Settings → Connectors → Add custom connector, then paste this address
https://baselens-api.vercel.app/mcp
~/.codex/config.toml
[mcp_servers.baselens]
url = "https://baselens-api.vercel.app/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "baselens": {
      "url": "https://baselens-api.vercel.app/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "baselens": {
      "type": "http",
      "url": "https://baselens-api.vercel.app/mcp"
    }
  }
}

Available tools 11

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

base
base_address
Base (chain 8453) address snapshot: EOA vs contract vs EIP-7702, ETH balance, nonce, code size and native USDC balance, at the latest block. Costs $0.002 USDC on Base via x402.
base_catalog
Lists every BaseLens tool with price, inputs and the equivalent x402 HTTP URL.
base_contract
Contract check on Base: is it a contract, code size, owner(), proxy implementation, and whether the source (and implementation) is verified on Sourcify, plus plain-language notes. Not an audit. Costs $0.003 USDC on Base via x402.
base_erc20_balance
ERC-20 balance of any address for any token on Base, with symbol and decimals already applied (raw and human-readable). Costs $0.002 USDC on Base via x402.
base_free_gas_sample
Free sample: latest Base block number and base fee (gwei). Use it to test the connection.
base_gas
Current Base gas: base fee, gas price, suggested EIP-1559 max fee and priority fee (gwei), block fullness, and cost of a plain ETH transfer. Costs $0.001 USDC on Base via x402.
base_name
Resolve a Basename (name.base.eth) or ENS name to its Base/Ethereum address, or reverse-resolve an address to its primary ENS/Basename. Includes avatar record. Costs $0.001 USDC on Base via x402.
base_price
On-chain USDC price of any Base ERC-20: executable Uniswap v3 quote for 1 whole token (direct USDC pool or via WETH, best fee tier). No third-party price API. Costs $0.003 USDC on Base via x402.
base_token
Token facts on Base: name, symbol, decimals, total supply, contract code size, owner() and EIP-1967 proxy implementation, plus plain-language notes (upgradeable? owner renounced?). Read-only facts, not advice. Costs $0.003 USDC on Base via x402.
base_transfers
Recent ERC-20 transfers in and out of an address on Base for up to 5 tokens (default USDC), newest first, over the last ~10k blocks (max 30k). Check incoming payments or wallet activity. Costs $0.004 USDC on Base via x402.
base_tx
Human-readable summary of a Base transaction: status, block time, from/to, value, total fee (incl. L1 fee), and decoded ERC-20 Transfer events with token symbols and amounts. Handy to verify a payment landed. Costs $0.003 USDC on Base via x402.

Endpoints

URLTransportStateLatencyChecked
https://baselens-api.vercel.app/mcp streamable-http answering 68 ms 10 min ago

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BaseLens — questions

Answers built from our own checks of this server.

What can BaseLens do?
It exposes 11 tools, read directly from the server on our last check. Among them: base_address, base_catalog, base_contract, base_erc20_balance, base_free_gas_sample, base_gas and 5 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 BaseLens working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 57 of 91 checks got a reply (62.6%), average response time 248 ms. The bar chart above shows every period we have measured.
The registry lists BaseLens 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 BaseLens?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does BaseLens need an API key?
No. BaseLens completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 11 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is BaseLens?
It answers our handshake in 248 ms on average, which is faster than 55% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.