FastBill MCP by usefulapi

FastBill MCP by usefulapi

Live endpoint: https://fastbill.usefulapi.io/mcp

Connect

• Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://fastbill.usefulapi.io/mcp.
• Claude Code: claude mcp add --transport http fastbill https://fastbill.usefulapi.io/mcp, then run /mcp to log in.
• VS Code: Add to VS Code.
• Cursor and other clients: add the URL as a remote MCP server:

{
  "mcpServers": {
    "fastbill": {
      "url": "https://fastbill.usefulapi.io/mcp"
    }
  }
}

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your FastBill credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/fastbill/

On first connect you will paste your FastBill login e-mail and API key. They are validated, stored per-user, and scoped to you. No keys in config files.

Tools

Tool	Type	What it does
fastbill_list_customers	read	List customers
fastbill_get_customer	read	Get customer
fastbill_list_contacts	read	List contacts
fastbill_list_invoices	read	List invoices
fastbill_get_invoice	read	Get invoice
fastbill_list_recurring_invoices	read	List recurring invoices
fastbill_list_estimates	read	List estimates
fastbill_list_expenses	read	List expenses
fastbill_list_revenues	read	List revenues
fastbill_list_articles	read	List products
fastbill_list_projects	read	List projects
fastbill_list_time_entries	read	List time entries
fastbill_list_templates	read	List document templates
fastbill_create_customer	write	Create customer
fastbill_update_customer	write	Update customer
fastbill_create_invoice	write	Create invoice
fastbill_complete_invoice	write	Finalize invoice
fastbill_set_invoice_paid	write	Mark invoice paid
fastbill_create_estimate	write	Create estimate
fastbill_create_article	write	Create product
fastbill_create_project	write	Create project
fastbill_create_time_entry	write	Create time entry
fastbill_usage_status	meta	Usage status (free-tier meter)
fastbill_request_feature	meta	Request a missing feature
fastbill_upgrade	meta	Upgrade to Pro (unlimited*)
fastbill_cancel_subscription	meta	Cancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Pro (per account)	$9/mo or $90/yr (2 months free)	Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with fastbill_upgrade (it returns a Stripe Checkout link). Cancel any time with fastbill_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running fastbill_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT