Gas Oracle API

io.github.Br0ski777Published by GitHub account Br0ski777v1.1.0Updated Oct 25, 2026

Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

VerifiedSSEWeb executableCloud & InfrastructureFinance

Overview

AI-generated overview

A remote MCP endpoint that gives an assistant live gas prices, gwei tiers and USD cost estimates for Base and Ethereum, paid per call.

What you can do
Fetch current gas prices for a chosen chain, defaulting to Base, with slow, standard, fast and instant confirmation tiers in gwei and estimated USD costs for a transfer or a swap, plus a congestion level.
When to use it
Useful when an assistant helps time or prepare on-chain transactions and needs current gas conditions before submitting one. It is not for swap quotes or wallet balances.
Requirements
A remote MCP endpoint added to the client configuration; no API key or signup. Each call is paid in USDC on Base L2 through the x402 protocol, so an x402-capable client and a funded wallet are needed.
Before you install
Every call costs money (listed at $0.003 per call) in USDC on Base, so an assistant that retries or polls can spend funds. Payment is handled by third-party facilitators, and the service is one of a larger marketplace of paid APIs.

Installation

In SourceWeft

  1. Open Gas Oracle API in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via SSE. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Br0ski777%2Fgas-oracle/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "gas-oracle-api": {
      "type": "sse",
      "url": "https://gas-oracle.api.klymax402.com/mcp"
    }
  }
}

README

Gas Oracle API

[MCP Server] [x402] [License: MIT]

Live gas prices with gwei tiers, USD cost estimates, and congestion level. Time your transactions perfectly. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

json
{  "mcpServers": {    "gas-oracle": {      "url": "https://gas-oracle.api.klymax402.com/mcp"    }  }}

Quickstart -- HTTP (x402)

bash
curl "https://gas-oracle.api.klymax402.com/api/price"# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
gas_get_current_priceGET/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers
gas_get_current_pricePOST/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers (POST variant)

gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

json
{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON. POST variant of gas_get_current_price -- same params passed as JSON body instead of query string.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

json
{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

Example agent prompts

  • "Current gas prices before submitting a transaction"
  • "Current gas prices before submitting a transaction"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Source: README.md at commit aa4ccfc

Tools

0
SourceWeft has not read this server's tools yet.

Version history

1
  1. v1.1.0LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declaredRequired10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts