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MCPFax On-Chain Toolkit MCP Server

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answering

MCPFax On-Chain Toolkit is answering right now. Last checked 3 min ago. It exposes 6 tools.

The on-chain facts you need in the seconds before you transact.

Uptime history 8 days of history
8 days agonow
100.0%
Uptime 24h
91 of 91 checks
6
Tools
read from the server
96 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check MCPFax On-Chain Toolkit every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

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 3 min ago.

run in your terminal
claude mcp add onchain-toolkit --transport http https://onchain-toolkit.bowling-anthony.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "onchain-toolkit": {
      "url": "https://onchain-toolkit.bowling-anthony.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.onchain-toolkit]
url = "https://onchain-toolkit.bowling-anthony.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "onchain-toolkit": {
      "url": "https://onchain-toolkit.bowling-anthony.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "onchain-toolkit": {
      "url": "https://onchain-toolkit.bowling-anthony.workers.dev/mcp"
    }
  }
}

Available tools 6

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

address
address_info
Native balance, the next nonce to use, and whether the address holds contract code — the three things needed before sending from or to an address. Pass 'token' as well to read an ERC-20 balance for the same address in the same call. Values are read at the latest block, so a reorg can change them. Costs $0.008 USDC per call via x402 on Base.
demand
demand_report
FREE, no payment. The aggregate of what agents have told us they are looking for, most-requested first, with the categories nothing available yet serves.
gas
gas_now
Live gas price on Ethereum, Base, Arbitrum, Optimism or Polygon — in wei and gwei, plus what a plain 21,000-gas transfer would cost in the native token, which is the number you actually budget with. Pass several chains comma-separated to compare where to execute. Call this immediately before sending a transaction: gas moves every block, so the answer is good for seconds, not minutes. Costs $0.005 USDC per call via x402 on Base.
request
request_data
FREE, no payment. Describe in your own words the data you are trying to buy — anything, not just on-chain data — and get back whether we operate a service that supplies it, with the MCP endpoint if so. Every request is catalogued so repeatedly-requested data gets built. Nothing identifying is stored, only the words of the request.
status
tx_status
Status of a transaction by hash: success, failed or still pending, with the block it landed in, sender and recipient, value moved, gas used, the fee actually paid, and how many logs it emitted. Use to confirm an action you took really settled rather than assuming it did. An unknown hash is reported as not_found and is NOT charged. Costs $0.005 USDC per call via x402 on Base.
token
token_info
Read an ERC-20's name, symbol, decimals and total supply straight from the contract on the chain you name, and confirm the address actually has code there. Use before quoting an amount or building a transfer: getting decimals wrong is the classic way to send 1,000,000x the intended value. An address with no code, or a contract that is not an ERC-20, is reported as such and is NOT charged. Costs $0.005 USDC per call via x402 on Base.

Endpoints

URLTransportStateLatencyChecked
https://onchain-toolkit.bowling-anthony.workers.dev/mcp streamable-http answering 115 ms 3 min ago

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MCPFax On-Chain Toolkit — questions

Answers built from our own checks of this server.

What can MCPFax On-Chain Toolkit do?
It exposes 6 tools, read directly from the server on our last check. Among them: address_info, demand_report, gas_now, request_data, token_info, tx_status. 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 MCPFax On-Chain Toolkit working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 96 ms. The bar chart above shows every period we have measured.
How do I connect MCPFax On-Chain Toolkit?
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 MCPFax On-Chain Toolkit need an API key?
No. MCPFax On-Chain Toolkit completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is MCPFax On-Chain Toolkit?
It answers our handshake in 96 ms on average, which is faster than 92% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.