# Invoice by Ouroboros Apps Muse connector

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

## Invoice by Ouroboros Apps

Create and manage freelance invoices with line items, rates, and late payment terms.

- Record: https://musedirectory.ai/connector/invoice-by-ouroboros-apps
- Category: Finance & Bills
- Developer: Ouroboros Apps (https://ouroborosapps.com/docs/invoice)
- 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, 361ms, checked 2026-10-29T10:01:05Z
- Endpoint: https://invoice-continuity2.vercel.app/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-10-28T20:51:12Z)
- Source: Found in the official MCP Registry (io.github.LAHutchins91/invoice) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.LAHutchins91%2Finvoice

Lets freelancers draft invoices with line items, set rates and quantities, define due dates and late fees, apply discounts, and seal invoices for approval. Supports suggested changes and explicit confirmation before finalizing.

Example request: "Create an invoice for a client with hourly rates for different tasks and set a due date two weeks from now."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Invoice by Ouroboros Apps to help me. It is a free service with an MCP server at https://invoice-continuity2.vercel.app/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- list_invoices: List the signed-in freelancer's invoices. Use a returned id with read_invoice. Do not guess an invoice.
- begin_invoice: Start a draft invoice. Draft figures are not an approved commitment until seal_invoice. Currency is a three-letter code. Amounts later are minor units of that currency and are the freelancer's figures.
- read_invoice: Read the invoice before answering. Quote only this record. Draft status is not an approved commitment. Proposed changes do not authorize a new line, a different rate, a discount, or a new due date.
- place_line: Add one line: description, quantity, rate in whole minor units, and unit hour, each, or day. After the invoice is sealed, a new line is refused until accept_invoice_change applies an add_line suggestion.
- describe_line: Correct a line description while the invoice is still a draft. After approval, a different description is refused. Use suggest_invoice_change with add_line for a different line.
- quote_line_rate: Set the rate already chosen for one line, as a whole number of minor units in the invoice currency. After the invoice is sealed, a different rate is refused until accept_invoice_change applies a change_rate suggestion.
- set_line_quantity: Set the quantity on one line. After the invoice is sealed, a different quantity is refused until accept_invoice_change applies an adjust_quantity suggestion.
- set_invoice_due: Set the due date as a calendar day in YYYY-MM-DD form. After the invoice is sealed, a different date is refused until accept_invoice_change applies a move_due_date suggestion.
- write_late_terms: Record late terms: grace days, and a basis of none, flat_fee, or percent_per_period. flat_fee uses feeMinor and a percent of 0. percent_per_period uses percent and a fee of 0. After approval, a different basis, grace, fee, or percent is refused until an accepted revise_late_terms
- offer_discount: Record a discount the freelancer is putting on the invoice. kind none uses value 0. kind percent takes a whole number from 1 to 100. kind fixed takes a whole number of minor units. After the invoice is sealed, a different discount is refused until accept_invoice_change applies an
- seal_invoice: Mark the current draft as the approved invoice. Pass confirmed true only after the freelancer explicitly approves the lines, quantities, rates, due date, late terms, and any discount already on the draft.
- suggest_invoice_change: Record a suggested change. This does not change the invoice. kind add_line requires description, quantity, rateMinor, and unit. kind change_rate requires lineId and rateMinor. kind apply_discount requires discountKind, discountValue, and discountNote. kind move_due_date requires 
- accept_invoice_change: Apply one suggested invoice change after the freelancer explicitly approves that change. Pass confirmed true only then. This is the path that may add a line, change a rate, apply a discount, or move the due date. Calling it is not a substitute for the freelancer's approval.

Screening checks:
- MCP handshake: pass (Answered in 608ms)
- Domain against threat feeds (Cloudflare security DNS): pass (invoice-continuity2.vercel.app 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: pass (13 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (Domain registered 2442 days ago)
- AI review of purpose and tool behavior: pass (No concerns)