MCPFax On-Chain Toolkit MCP server
The on-chain facts you need in the seconds before you transact.
Little public usage data yet
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If you have run it, two minutes of your experience saves the next person an afternoon.
MCPFax On-Chain Toolkit tools (6)
write = sends, deletes, buys or postsaddress_infoFreeNative 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_reportFreeFREE, 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_nowFreeLive 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_dataFreeFREE, 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.
token_infoFreeRead 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.
tx_statusFreeStatus 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.
Public scan report
scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 252ms20/20
- Tool poisoning6 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenanceno repository listed3/15
- Maintainer identityverified namespace with website, no repo4/10
Findings (1)
- lowNo source repository listed
maint.no-repo
Install directly
claude mcp add --transport http onchain-toolkit https://onchain-toolkit.bowling-anthony.workers.dev/mcp
MCPFax On-Chain Toolkit: common questions
- Is MCPFax On-Chain Toolkit MCP server safe?
- With care: it is graded C, so read the findings first (69/100). Read the MCPFax On-Chain Toolkit safety report
- How do I install MCPFax On-Chain Toolkit?
- It runs remotely at onchain-toolkit.bowling-anthony.workers.dev. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does MCPFax On-Chain Toolkit need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is MCPFax On-Chain Toolkit maintained?
- The latest release is v1.0.2.
- Is MCPFax On-Chain Toolkit up?
- 100% of our last 9 checks got an answer. We check remote servers about four times a day.