# Invoice Simple Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Invoice Simple

Create invoices and estimates, look up clients and check what is still unpaid

- Record: https://musedirectory.ai/connector/invoice-simple
- Category: Finance & Bills
- Developer: Cotlet (https://cotlet.dev/integrations/invoice-simple-api-mcp-server)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, sign-in needed, 44ms, checked 2026-11-09T11:51:23Z
- Endpoint: https://cotlet.dev/mcp/v1/invoice-simple/connect
- Auth: Sign in with your account; Pricing: unknown
- Screening: Screened, no issues found (2026-11-09T11:51:23Z)
- Source: Found in the official MCP Registry (dev.cotlet/invoice-simple) https://registry.modelcontextprotocol.io/v0/servers?search=dev.cotlet%2Finvoice-simple

Connects Muse to Invoice Simple so you can draft invoices and estimates, add line items, look up client details and see which invoices are still unpaid. Useful for freelancers and small teams who bill clients regularly.

Example request: "Make an invoice for my client Acme for last month's design work and tell me if their previous invoice is still unpaid."

How to connect: Invoice Simple is not in Muse's Connectors list yet, and it needs you to sign in with your Invoice Simple account. Apps that need this kind of sign-in usually cannot be used from a Muse chat yet. Follow it here and we will tell you when it reaches Muse.

Screening checks:
- MCP handshake: pass (Requires sign-in (publishes OAuth metadata))
- Domain against threat feeds (Cloudflare security DNS): pass (cotlet.dev not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: n/a (Tools are behind sign-in)
- Inputs asking for passwords, card numbers or seed phrases: n/a (Tools are behind sign-in)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)