Sienge MCP by usefulapi

Sienge MCP by usefulapi

Use your Sienge account from Claude, Cursor, or any MCP client. Read customers, contracts, receivables, purchase orders and units, and create customers. Hosted, no local install: connect with your own credentials.

Live endpoint: https://sienge.usefulapi.io/mcp · Homepage: https://usefulapi.io

Connect

• Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://sienge.usefulapi.io/mcp.
• Claude Code: claude mcp add --transport http sienge https://sienge.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": {
    "sienge": {
      "url": "https://sienge.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 Sienge credentials.

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

On first connect you provide your Sienge subdomain (the first part of your Sienge address), and an API user name and API user password from the Painel de Integrações of your Sienge account. The server validates it and stores it per user. No keys go in config files.

Tools

Tool	Type	What it does
sienge_list_customers	read	List customers
sienge_get_customer	read	Get a customer
sienge_create_customer	write	Create a customer
sienge_list_companies	read	List companies
sienge_list_enterprises	read	List enterprises
sienge_list_creditors	read	List creditors
sienge_get_creditor	read	Get a creditor
sienge_list_sales_contracts	read	List sales contracts
sienge_get_sales_contract	read	Get a sales contract
sienge_list_receivable_bills	read	List receivable bills
sienge_list_receivable_installments	read	List receivable installments
sienge_list_purchase_orders	read	List purchase orders
sienge_get_purchase_order	read	Get a purchase order
sienge_list_purchase_invoices	read	List purchase invoices
sienge_list_units	read	List units
sienge_get_unit	read	Get a unit
sienge_list_departments	read	List departments
sienge_usage_status	meta	Usage status (free-tier meter)
sienge_request_feature	meta	Request a missing feature
sienge_upgrade	meta	Upgrade to Pro or Pro+
sienge_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 user)	$9/mo or $90/yr (2 months free)	10,000 tool calls / month
Pro+ (per user)	$39/mo or $390/yr (2 months free)	100,000 tool calls / month

Each paid plan covers this server only. Ask your AI to run sienge_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with sienge_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with sienge_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT — see LICENSE. Documentation only; the server is hosted.