x402 Seller MCP

An MCP server that exposes paid API endpoints for crypto and DeFi data, such as ETH/BTC prices, gas fees, and DefiLlama metrics, using the x402 protocol for USDC payments on Base. It allows AI agents to retrieve financial data by handling payment verification via the PAYMENT header.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by entreprisedaney33-rgb

Vendor documentation

What you can do with it

Retrieve real-time cryptocurrency prices like ETH and BTC in USD
Fetch current gas prices for Ethereum and Base networks
Query DeFi protocol TVL and yield data from DefiLlama
Access USDC supply metrics via dedicated API endpoints

Source and maintenance

Community listingRegistry 0.1.1

mcp-registry: io.github.entreprisedaney33-rgb/x402-seller-mcp@0.1.1 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

x402-seller-mcp 0.1.1

npm

x402-seller-mcp package definition

{
  "version": "0.1.1",
  "transport": "stdio",
  "identifier": "x402-seller-mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org",
  "environmentVariables": [
    {
      "name": "BUYER_PRIVATE_KEY",
      "description": "EVM private key (0x...) of a throwaway wallet funded with a small amount of USDC on Base. Leave unset for explain-only mode (tool calls describe the 402 payment challenge instead of paying)."
    },
    {
      "name": "X402_ORIGIN",
      "default": "https://x402-seller-0ay3.onrender.com",
      "description": "Which x402-compatible server to expose as MCP tools."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "x402-seller-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp@0.1.1"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<YOUR_BUYER_PRIVATE_KEY>",
        "X402_ORIGIN": "<YOUR_X402_ORIGIN>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "x402-seller-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp@0.1.1"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<YOUR_BUYER_PRIVATE_KEY>",
        "X402_ORIGIN": "<YOUR_X402_ORIGIN>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "x402-seller-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp@0.1.1"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<YOUR_BUYER_PRIVATE_KEY>",
        "X402_ORIGIN": "<YOUR_X402_ORIGIN>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "x402-seller-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "x402-seller-mcp@0.1.1"
      ],
      "env": {
        "BUYER_PRIVATE_KEY": "<YOUR_BUYER_PRIVATE_KEY>",
        "X402_ORIGIN": "<YOUR_X402_ORIGIN>"
      }
    }
  }
}

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