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SmartBill MCP by usefulapi

io.usefulapi/smartbill in the official MCP registry. Endpoint https://smartbill.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.

The registry describes it as: Read SmartBill series, taxes, stock, clients and products; draft and issue invoices and estimates.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

claude mcp add --transport http smartbill https://smartbill.usefulapi.io/mcp

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

code --add-mcp '{"name":"smartbill","type":"http","url":"https://smartbill.usefulapi.io/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

smartbill_list_series smartbill_list_taxes smartbill_get_stock smartbill_get_invoice_payment_status smartbill_get_estimate_invoices smartbill_list_clients smartbill_get_client smartbill_list_suppliers smartbill_get_supplier smartbill_list_products smartbill_get_product smartbill_list_warehouses smartbill_list_vat_rates smartbill_create_invoice smartbill_create_invoice_from_estimate smartbill_create_estimate smartbill_reverse_invoice smartbill_cancel_invoice smartbill_restore_invoice smartbill_cancel_estimate smartbill_restore_estimate smartbill_record_invoice_payment smartbill_send_document

Tool changes

We compare every full read of this server with the one before. No change in what its tools say has been seen since we started keeping this record on 2026-10-30.

Fingerprint of its tools at our last full read (2026-11-01): e8db40d5f6c76841. A client can hash the tools it is served the same way and compare; the full value and a hash per tool are in this page as JSON.

Run this server? Show the check in your README

The badge reflects the latest weekly read:

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-usefulapi-smartbill/badge.svg)](https://lazaretto.dev/mcp-registry/io-usefulapi-smartbill)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.

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