blocknative-mcp

Instructions

Implementation Reference

• src/blocknative_mcp/cli.py:141-169 (handler)

  The handler function for the 'get_supported_chains' MCP tool, including the @mcp.tool() decorator for registration. It calls the fetch_supported_chains helper and formats the response as a Markdown table listing supported blockchain networks.
  @mcp.tool() async def get_supported_chains(ctx: Optional[Context] = None) -> str: """ List the blockchain networks supported by the Blocknative Gas Platform, formatted as a Markdown table. Parameters: - ctx (Optional[Context]): The MCP context object. Default: None. Returns: - A Markdown table listing supported chains with their chain ID, system, and network. """ data = await fetch_supported_chains() if data["error"]: return data["error"] chains = data["chains"] if not chains: return "No supported chains found." output = "Supported Chains:\n\n" output += "| Chain ID | System | Network |\n" output += "|----------|--------|---------|\n" for chain in chains: chain_id = chain.get("chainId", "Unknown") system = chain.get("system", "Unknown") network = chain.get("network", "Unknown") output += f"| {chain_id} | {system} | {network} |\n" return output
• src/blocknative_mcp/cli.py:49-60 (helper)

  Helper utility function that fetches the list of supported chains from the Blocknative API endpoint.
  # Helper function to fetch supported chains from Blocknative async def fetch_supported_chains() -> Dict: """Fetch the list of supported chains from Blocknative Chains API.""" try: headers = {"Authorization": BLOCKNATIVE_API_KEY} if BLOCKNATIVE_API_KEY else {} async with httpx.AsyncClient() as client: response = await client.get(BLOCKNATIVE_CHAINS_API_URL, headers=headers) response.raise_for_status() data = response.json() return {"chains": data, "error": None} except httpx.HTTPError as e: return {"chains": [], "error": f"Failed to fetch supported chains: {str(e)}"}