alchemy/alchemy-mcp-server

> [!IMPORTANT]
> **The legacy local MCP server has been retired.** Its source code has been removed from this repository, and the @alchemy/mcp-server npm package will stop working on **September 30, 2026**. Use the hosted Alchemy MCP Server at https://mcp.alchemy.com/mcp instead.
The hosted Alchemy MCP Server gives AI agents access to Alchemy's blockchain APIs and onchain data. It authenticates via OAuth — just sign in with your Alchemy account when prompted. No API key or local install required.
**Full documentation:** alchemy.com/docs/alchemy-mcp-server
Setup
| Client | Setup |
| ------------------- | ---------------------------------------------------------------------------------- |
| **Claude Code** | claude mcp add alchemy --transport http https://mcp.alchemy.com/mcp |
| **Codex** | codex mcp add alchemy --url https://mcp.alchemy.com/mcp |
| **Cursor** | Add to ~/.cursor/mcp.json or .cursor/mcp.json — see JSON config below |
| **Windsurf** | Add to ~/.codeium/windsurf/mcp_config.json — see JSON config below |
| **VS Code Copilot** | Add to .vscode/mcp.json — see JSON config below |
| **Claude Desktop** | Add to claude_desktop_config.json — see JSON config below |
| **Cline** | Open Cline: MCP Servers from the VS Code command palette — see JSON config below |
JSON config for Cursor / Windsurf / Claude Desktop / Cline
JSON config for VS Code Copilot
For any other MCP-compatible client, point it at https://mcp.alchemy.com/mcp using Streamable HTTP transport.
Migrating from the local server
If your MCP config runs the local server through npx, like this:
replace that entry with the hosted server config for your client from the Setup section above. You can drop ALCHEMY_API_KEY from your MCP config; the hosted server signs you in with your Alchemy account instead.