# Ausca (MCP server)

> Ausca is an MCP server that adds web browsing tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Pay-per-call APIs and MCP services for agents, no accounts or keys, with verifiable receipts. It has 36 GitHub stars, is released under the MIT license and runs locally with npx -y ausca.

Pay-per-call APIs and MCP services for AI agents: document OCR, document analysis, media transcription, remote browser sessions, and agent email inboxes. No account, no API keys; USDC on Base per call, a signed receipt for every completed invocation.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/auscahq/ausca |
| GitHub stars | 36 |
| License | MIT |
| Language | TypeScript |
| Transport | stdio, streamable-http |
| Packages | npm: ausca |
| Remote URL | https://ausca.com/mcp |
| Needs API key | no |
| Official | yes |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code, Claude.ai, ChatGPT |
| Category | Web & browsing |
| Latest release | none |
| Last commit | Sep 28, 2026 |
| MCP registry name | com.ausca/agent-services |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "ausca": {
      "command": "npx",
      "args": [
        "-y",
        "ausca"
      ],
      "env": {
        "AUSCA_PRIVATE_KEY": "your-value"
      }
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --env AUSCA_PRIVATE_KEY=your-value --transport stdio ausca -- npx -y ausca
```

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

```json
{
  "mcpServers": {
    "ausca": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "ausca"
      ],
      "env": {
        "AUSCA_PRIVATE_KEY": "your-value"
      }
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

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

```json
{
  "inputs": [
    {
      "type": "promptString",
      "id": "ausca_private_key",
      "description": "AUSCA_PRIVATE_KEY",
      "password": true
    }
  ],
  "servers": {
    "ausca": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "ausca"
      ],
      "env": {
        "AUSCA_PRIVATE_KEY": "${input:ausca_private_key}"
      }
    }
  }
}
```

### Claude Code (remote)

```sh
claude mcp add --transport http ausca "https://ausca.com/mcp"
```

The same server is also hosted as a remote MCP endpoint, so nothing runs on your machine.

Config formats checked against the official docs on 2026-10-07.

## Environment variables

- `AUSCA_PRIVATE_KEY` (secret): Optional local wallet key for paid tools. Discovery and artifact commit remain keyless.
- `AUSCA_MAX_PAYMENT_USD`: Required positive per-call USD cap whenever AUSCAPRIVATEKEY is configured.

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---

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