Billy (billy.dk) accounting: invoices, journal entries, trial balance, with write protection.
Connect Billy to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Billy (billy.dk) accounting: invoices, journal entries, trial balance, with write protection. The billy mcp server is what makes that connection.
Log into mit.billy.dk → Settings → Access tokens → Create access token. Tokens are per-company and don't expire.
billy-mcp on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.
Configuration is passed through the environment: BILLY_ACCESS_TOKEN, BILLY_ORGANIZATION_ID, BILLY_BASE_URL. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. It is maintained by Thourum; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
{
"mcpServers": {
"billy": {
"command": "npx",
"args": ["-y", "billy-mcp"],
"env": {
"BILLY_ACCESS_TOKEN": "<your token>"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| BILLY_ACCESS_TOKEN | Credential the server authenticates with. | Yes |
| BILLY_ORGANIZATION_ID | Configuration value read at startup. | Optional |
| BILLY_BASE_URL | Endpoint or connection string the server talks to. | Yes |
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