# PayStage MCP server

> Enforces safety policies for AI agent payments by evaluating transactions against local rules to return pay, review, or deny decisions.

- Repository: https://github.com/base-buzz/paystage
- Page: https://hostedmcp.org/servers/base-buzz/paystage
- Transport: stdio
- Stars: 5
- License: MIT

## Install

### Claude Code

```sh
claude mcp add paystage -- npx -y @paystage/mcp
```

### Cursor (`~/.cursor/mcp.json`)

```json
{
  "mcpServers": {
    "paystage": {
      "command": "npx",
      "args": [
        "-y",
        "@paystage/mcp"
      ]
    }
  }
}
```

### VS Code (`.vscode/mcp.json`)

```json
{
  "servers": {
    "paystage": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@paystage/mcp"
      ]
    }
  }
}
```

### VS Code CLI

```sh
code --add-mcp '{"name":"paystage","type":"stdio","command":"npx","args":["-y","@paystage/mcp"]}'
```

### Claude Desktop (`claude_desktop_config.json`)

```json
{
  "mcpServers": {
    "paystage": {
      "command": "npx",
      "args": [
        "-y",
        "@paystage/mcp"
      ]
    }
  }
}
```

### Codex

```sh
codex mcp add paystage -- npx -y @paystage/mcp
```

### Codex config.toml (`~/.codex/config.toml`)

```toml
[mcp_servers.paystage]
command = "npx"
args = ["-y", "@paystage/mcp"]
```

### Gemini CLI

```sh
gemini mcp add -s user paystage npx -- -y @paystage/mcp
```

### Gemini settings.json (`~/.gemini/settings.json`)

```json
{
  "mcpServers": {
    "paystage": {
      "command": "npx",
      "args": [
        "-y",
        "@paystage/mcp"
      ]
    }
  }
}
```

## Environment variables

| Name | Required | Secret | Description |
|---|---|---|---|
| `PAYSTAGE_POLICY_PATH` | no | no |  |
| `PAYSTAGE_RPC_URL` | no | no |  |

## Tools (5)

- `evaluate_mcp_payment`
- `list_outstanding_auths`
- `evaluate_outstanding_auths`
- `evaluate_hip3_trade`
- `evaluate_velocity`

## FAQ

### What does PayStage do?

PayStage acts as a safety layer for AI agent wallets, deciding whether a proposed payment should proceed, require human review, or be denied based on a local policy.

### How is payment behavior controlled?

All payment decisions are governed by a single local policy file that defines rules for different agent types.

### Does the server require an RPC endpoint?

Yes, it uses an RPC endpoint for on-chain checks, which defaults to a public Base RPC if not specified.