Professor Sausages Onchain MCP MCP server

An official MCP server by Professor Sausages providing on-chain data tools for AI agents. It offers pay-per-call access to EVM gas prices, Chainlink token prices, token safety checks, swap quotes, ENS resolution, and OFAC sanctions screening without requiring API keys or subscriptions.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Professor Sausages

MCP endpoint (Streamable HTTP)

https://x402.professorsausages.com/mcp/onchain

Vendor documentation

What you can do with it

Retrieve live EIP-1559 gas fee suggestions for transactions
Check token safety and ownership status on EVM chains
Get indicative swap quotes from UniswapV2 pools
Resolve ENS names to addresses and screen for OFAC sanctions

Tools advertised by the last live check:

find_data
pricing
request_data
gas_price
gas_compare
spot_price
token_safety
address_screen
swap_quote
ens_resolve
chain_info
nft_scam_check

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http professor-sausages-onchain-mcp https://x402.professorsausages.com/mcp/onchain

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add professor-sausages-onchain-mcp --url https://x402.professorsausages.com/mcp/onchain

Cursor

Merge this server into .cursor/mcp.json in your project, then enable professor-sausages-onchain-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "professor-sausages-onchain-mcp": {
      "url": "https://x402.professorsausages.com/mcp/onchain"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "professor-sausages-onchain-mcp": {
      "type": "streamableHttp",
      "url": "https://x402.professorsausages.com/mcp/onchain",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start professor-sausages-onchain-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "professor-sausages-onchain-mcp": {
      "type": "http",
      "url": "https://x402.professorsausages.com/mcp/onchain"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http professor-sausages-onchain-mcp https://x402.professorsausages.com/mcp/onchain

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "professor-sausages-onchain-mcp": {
      "url": "https://x402.professorsausages.com/mcp/onchain"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "professor-sausages-onchain-mcp": {
      "serverUrl": "https://x402.professorsausages.com/mcp/onchain"
    }
  }
}

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