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Gas Fee Predictor

by higherbeing · remote · local (npm) · no sign-in to list tools · v1.0.2 · published by GitHub user higherbeing

Live Ethereum and L2 gas fees: current gas, cheapest L2, forecast, ETH price, cost estimates.

Changes · 1
CompareRegistry entry

7 tools: 1 change things and 6 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http gasfeepredictor https://api.gasfeepredictor.com/api/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

7 tools

Changes things 1Claude Code: ask
  • estimate_transaction_costEstimate the current USD gas cost of a specific Ethereum mainnet action (ETH transfer, ERC-20/USDC transfer, Uniswap swap, or NFT mint), or a custom gas-units amount, at the chosen…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Estimate the current USD gas cost of a specific Ethereum mainnet action (ETH transfer, ERC-20/USDC transfer, Uniswap swap, or NFT mint), or a custom gas-units amount, at the chosen priority tier.
Only reads 6Claude Code: allow
  • best_time_to_transactFind out whether to send a transaction now or wait — returns the current recommendation, expected savings, and when the next cheaper gas window is predicted.No findings

    Why it is in this group

    • The description's first verb is "find": a word for reading.
    Description, as the server wrote it
    Find out whether to send a transaction now or wait — returns the current recommendation, expected savings, and when the next cheaper gas window is predicted.
  • get_current_gasGet the current Ethereum mainnet gas price (low / average / high, in Gwei) plus the live ETH/USD price and a send-now-vs-wait recommendation.No findings

    Why it is in this group

    • The name "get_current_gas" says "get": a word for reading.
    Description, as the server wrote it
    Get the current Ethereum mainnet gas price (low / average / high, in Gwei) plus the live ETH/USD price and a send-now-vs-wait recommendation. Use this to answer "what is the gas fee right now".
  • get_eth_priceGet the current ETH/USD spot price and its 24-hour change.No findings

    Why it is in this group

    • The name "get_eth_price" says "get": a word for reading.
    Description, as the server wrote it
    Get the current ETH/USD spot price and its 24-hour change.
  • get_gas_forecastGet the forward-looking hourly Ethereum gas forecast (up to 24 hours ahead) with the predicted cheapest window.No findings

    Why it is in this group

    • The name "get_gas_forecast" says "get": a word for reading.
    Description, as the server wrote it
    Get the forward-looking hourly Ethereum gas forecast (up to 24 hours ahead) with the predicted cheapest window. Use for "when will gas be cheaper", "should I wait until tomorrow", or planning a transaction.
  • get_gas_historyGet recent historical Ethereum mainnet gas prices over a chosen window, with min/max/average.No findings

    Why it is in this group

    • The name "get_gas_history" says "get": a word for reading.
    Description, as the server wrote it
    Get recent historical Ethereum mainnet gas prices over a chosen window, with min/max/average. Use to answer "what has gas been doing", "was gas cheaper yesterday", or to compare the current price against a recent baseline.
  • get_l2_gasCompare live Layer-2 gas fees across Arbitrum, Base, Optimism, and Polygon (Gwei and the estimated wallet fee in USD for a standard transfer), and identify the cheapest right now.No findings

    Why it is in this group

    • The name "get_l2_gas" says "get": a word for reading.
    Description, as the server wrote it
    Compare live Layer-2 gas fees across Arbitrum, Base, Optimism, and Polygon (Gwei and the estimated wallet fee in USD for a standard transfer), and identify the cheapest right now. Use for "cheapest L2" / "L2 gas fees" questions.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Looked at Oct 22, 2026, 15:00 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
1
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • WarnThe whole server

    The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://api.gasfeepredictor.com/api/mcp: tools/list returned 7 tools to an anonymous client, including estimate_transaction_cost (write)

    What this check looks for

Install

Pinned to version 1.0.2. Values in angle brackets are yours to fill in.

claude mcp add --transport http gasfeepredictor https://api.gasfeepredictor.com/api/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__gasfeepredictor__get_current_gas",
      "mcp__gasfeepredictor__get_l2_gas",
      "mcp__gasfeepredictor__get_eth_price",
      "mcp__gasfeepredictor__best_time_to_transact",
      "mcp__gasfeepredictor__get_gas_forecast",
      "mcp__gasfeepredictor__get_gas_history"
    ],
    "ask": [
      "mcp__gasfeepredictor__estimate_transaction_cost"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as gasfeepredictor. Review it before you use it.