Issue official Mexican tax invoices (CFDIs 4.0) and resolve SAT tax codes for your business.
Connects to Mexico's SAT tax authority to issue and stamp official CFDIs 4.0. Resolves tax product codes, validates invoices before submission, calculates totals with IVA and withholdings, and tracks daily emission limits. Requires API key and Mexican business registration.
Try asking Muse: "Create and send an official invoice to a client for consulting services with the correct SAT tax classification and IVA."
Source: Found in the official MCP Registry (io.github.HEUSAI/notsy-facturacion) · First listed September 25, 2026
Each bar is one check, every 15 minutes. Green means it answered. Last checked 1 h ago.
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Sensitive: this app deals with your money. Only connect it if you are comfortable with Muse reading that information.
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Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. 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.
https://mcp.notsy.com.mx/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Notsy Facturación is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
In Claude, open Settings, then Connectors.
Choose Add custom connector, give it a name, and paste the link.
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://mcp.notsy.com.mx/mcpResponse time at the last check: 533ms. Worked in 99.1% of checks over 30 days.
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
whoamiConfirma la identidad del agente: a qué negocio pertenece la API key, sus permisos (scopes), límites de emisión y uso del día. Úsalo para diagnosticar la conexión.resolver_claves_satConvierte una descripción en lenguaje natural a las claves del SAT necesarias para facturar. Devuelve `sugerencia` con clave_prodserv, clave_unidad, objeto_imp, tasa_iva y uso_cfdi, más `candidatos` por si quieres elegir otra. Llámalo antes de armar un concepto si no conoces las preview_facturaDRY-RUN: valida la factura y calcula los totales (subtotal, IVA, retenciones, total) SIN timbrar, reservar ni cobrar. También devuelve la cotización canónica de créditos y el saldo proyectado. Úsalo SIEMPRE antes de emitir_cfdi para confirmar el monto, el costo y que los datos paemitir_cfdiEmite y timbra un CFDI 4.0 OFICIAL ante el SAT (acción real, con costo y difícil de revertir). Llama primero a preview_factura. El motor aplica los límites de la API key (puede requerir aprobación humana) y registra la acción en la bitácora. Args: iguales a preview_factura, más: https://mcp.notsy.com.mx/mcpNot in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Notsy Facturación to help me. It is a free service with an MCP server at https://mcp.notsy.com.mx/mcp. It needs an API key from Notsy; ask me to enter it through your secure credential prompt. 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.
At the last check (November 13, 2026, 17:31 UTC) the endpoint was working, answering in 533ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
It was screened on September 25, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
It exposes 4 tools, including whoami, resolver_claves_sat, preview_factura, emitir_cfdi. For example, you could ask Muse: "Create and send an official invoice to a client for consulting services with the correct SAT tax classification and IVA."
This listing was added from public sources (Found in the official MCP Registry (io.github.HEUSAI/notsy-facturacion)). If you build Notsy Facturación, claim it to correct the details and get your badge.
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