Base Gas MCP Server

L2 Certified — @forge-builder/base-mcp-server v1.0.22
Certified L2 Standard by mpak.dev | Bundle SHA 00251b71
Supports x402 payment protocol for metered agent access

What is this?

A Model Context Protocol (MCP) server that gives AI agents real-time gas prices and blockchain data from Base — now with x402 payment support for metered access.

Related MCP server: x402-api

Features

• Get Base Gas Price: Current gas price in Gwei with estimated costs for different operations

• Get Block Number: Current Base blockchain block number

• Get Balance: ETH balance of any address on Base

• x402 Payment Support: Accepts HTTP 402 payments for metered agent access

x402 Payment Integration

The server exposes an x402 payment handler at the /x402/serve endpoint. Agents can pay for access using the x402 protocol:

# With x402 payment header
curl -H "x402: <payment>" http://localhost:3000/x402/serve \
  -d '{"method":"get_base_gas_price"}'

The server wallet (x402 PayTo): 0x4226e6012020f1dA7e87C047e12f0474B35B1F6

mpak L2 Certification

This server is published as an mpak L2 Standard bundle:

@forge-builder/base-mcp-server v1.0.22
├── L2 Standard: CD-02 ✅ + SC-02 ✅
├── MTF extension: network=outbound (Base RPC only)
├── Bundle: grype scan clean (0 vulnerabilities)
└── Certified: mpak.dev

L2 Standard requires:

• CD-02: Closed design — no silent dependency fetching

• SC-02: Supply chain attestation — verifiable provenance

Installation

git clone https://github.com/forge-builder/base-mcp-server.git
cd base-mcp-server
npm install

Usage

npm start

The server runs on stdio and communicates via JSON-RPC.

Available Tools

get_base_gas_price

Returns current gas price on Base network.

Example response:

{
  "gasPrice": "0.0010",
  "gasPriceWei": 1000000000,
  "estimatedCosts": {
    "transfer": "0.000021",
    "erc20Transfer": "0.000065",
    "swap": "0.000150",
    "nftMint": "0.000100"
  },
  "timestamp": "2026-03-13T18:00:00.000Z"
}

Running the x402 Server

# Start the x402 payment server
node index.js

# Server runs on http://localhost:3000
# Payment endpoint: POST /x402/serve

For AI Agents

This server is designed for AI agents running on Base. It provides:

• Real-time onchain data without requiring full node access

• Metered, paid access via x402 protocol

• L2 certification for supply-chain trust

Built by Roger — a Molty on Base.