Askell

MCP server for the Askell payment and subscription API.

Connect it to Cursor, Claude Desktop, or any MCP client to discover Askell endpoints, inspect customers/contracts/billing, and call the API — with confirmation before mutating requests.

Requirements

• An Askell account and secret API key (from the Askell dashboard)
• One of:
  • Bun ≥ 1.3.14 (for bunx), or
  • a prebuilt binary from Releases (no Bun needed)

Quick start

1. Get API keys

In the Askell dashboard, copy your private (secret) API key. Optionally also the public key (only needed for temporary payment-method / checkout status endpoints).

2. Add to your MCP client

With Bun (bunx):

{
  "mcpServers": {
    "askell": {
      "command": "bunx",
      "args": ["-y", "askell-mcp"],
      "env": {
        "ASKELL_PRIVATE_API_KEY": "your_secret_api_key"
      }
    }
  }
}

With a binary (download askell-mcp-<os>-<arch> from Releases, then chmod +x):

{
  "mcpServers": {
    "askell": {
      "command": "/absolute/path/to/askell-mcp-linux-x64",
      "env": {
        "ASKELL_PRIVATE_API_KEY": "your_secret_api_key"
      }
    }
  }
}

Example file: mcp.json.example.

Restart the client after saving.

Configuration

Askell has no separate sandbox host — production and test traffic use the same URL. Use the Áskell Test Gateway acquirer in your dashboard for safe payment testing. See Askell getting started.

What you can do

Typical agent workflow:

1. Discover — askell_list_operations / askell_describe_operation (from bundled OpenAPI v1 + v2)
2. Support tasks — customer/contract/billing helpers below
3. Anything else — askell_call for a raw endpoint (mutations ask for approval when enabled)

Tools

Resources

API notes (short)

• v1 — legacy paths like /customers/, /subscriptions/ (no /v2 prefix)
• v2 — current model: catalogs, quotes, checkouts, contracts, billing runs under /v2/
• Paths use trailing slashes
• Prefer v2 for new integrations; v1 remains for existing ones
• Docs: docs.askell.is · OpenAPI: v1 · v2

License

MIT

Contributing

See CONTRIBUTING.md for local development, tests, and releases.