How it works

Connect an agent. Define the boundary.
Let Elypx402 compile the purchase.

An AI agent often needs to pay for data or an API. Elypx402 sits in between: you set the spending limits once, the agent asks before it buys, and every request is checked against your rules and kept as a record. The agent never holds your main wallet.

01
Connect an agent
Install the Elypx402 MCP server in the agent you already use. It gets a token scoped to one Agent Account, never your main wallet.
Seed phrases and main-wallet keys are never requested.
02
Define the boundary
Pick which vendors the agent may pay, which HTTP methods it may use, and the per-request, daily and lifetime caps in USDC.
The same rules are checked again at execution, not just at planning.
03
Compile and inspect
The agent describes what it needs. Elypx402 returns an ALLOW or BLOCK with each check and a suggested policy change, and keeps the Mission.
Today this ends at the decision. Payment execution is switched off until a verified Elysium runner is live.

Your agentClaude Code, Codex, Cursor and more

Elypx402policy · plan · audit

x402 vendorpays only if allowed

Install the MCP server

Add it to your agent in one command.

Package @elypx402/mcp · Node 20+ · 9 tools · 8 clients

Run in your terminal

claude mcp add elypx402 --transport stdio \
  --env ELYPX402_BASE_URL=https://api.elypx402.com \
  --env ELYPX402_TOKEN=<scoped-token> \
  -- npx -y @elypx402/mcp

Then run /mcp inside Claude Code to confirm elypx402 is connected.

Run in your terminal

codex mcp add elypx402 \
  --env ELYPX402_BASE_URL=https://api.elypx402.com \
  --env ELYPX402_TOKEN=<scoped-token> \
  -- npx -y @elypx402/mcp

This writes ~/.codex/config.toml. Check it with codex mcp list.

Add to ~/.cursor/mcp.json (or .cursor/mcp.json in a project)

{
  "mcpServers": {
    "elypx402": {
      "command": "npx",
      "args": ["-y", "@elypx402/mcp"],
      "env": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      }
    }
  }
}

Restart Cursor, then enable the server under Settings → MCP.

Add to ~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "elypx402": {
      "command": "npx",
      "args": ["-y", "@elypx402/mcp"],
      "env": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      }
    }
  }
}

Refresh the MCP list in Cascade after saving.

Add to ~/.gemini/settings.json

{
  "mcpServers": {
    "elypx402": {
      "command": "npx",
      "args": ["-y", "@elypx402/mcp"],
      "env": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      }
    }
  }
}

Run /mcp in Gemini CLI to list connected servers.

Add to .vscode/mcp.json

{
  "servers": {
    "elypx402": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@elypx402/mcp"],
      "env": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      }
    }
  }
}

VS Code uses servers, not mcpServers. Start it from the MCP view.

Add to Zed settings.json

{
  "context_servers": {
    "elypx402": {
      "command": "npx",
      "args": ["-y", "@elypx402/mcp"],
      "env": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      }
    }
  }
}

Zed calls MCP servers context_servers. Check the Agent panel for a green dot.

Add to ~/.config/opencode/opencode.json

{
  "mcp": {
    "elypx402": {
      "type": "local",
      "command": ["npx", "-y", "@elypx402/mcp"],
      "environment": {
        "ELYPX402_BASE_URL": "https://api.elypx402.com",
        "ELYPX402_TOKEN": "<scoped-token>"
      },
      "enabled": true
    }
  }
}

OpenCode puts the command in one array and calls env environment.

What your agent can call

elypx402_statusreadiness and honest execution state
list_agent_accountsaccounts visible to the token
preview_payment_planpolicy decision, nothing saved
create_payment_missionsave a Mission with its trace
get_missionread a Mission and its checks
get_receiptsettlement receipt, once one exists
get_resourcedelivered resource, hash-matched
cancel_missioncancel before execution
execute_payment_missiondisabled until a verified runner is live

Tokens are scoped to a single Agent Account and issued by the Core API after wallet sign-in. Payment execution stays disabled until a verified Elysium runner is live. Logos identify compatible clients and do not imply endorsement.