Notsy Facturación
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
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 24 min ago.
Is it safe to connect?
What Muse can see: You sign in to your own account with it, so Muse can reach what that account allows. Read what it asks for before you agree.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
Sensitive: this app deals with your money. Only connect it if you are comfortable with Muse reading that information.
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How to add it to Muse
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.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1552ms. Worked in 100% of checks over 30 days.
Screening · September 25, 2026
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.
Tools · 4
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: Recent checks
Link
https://mcp.notsy.com.mx/mcpQuestions about Notsy Facturación in Muse
How do I connect Notsy Facturación to Muse?
Not 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.
Is Notsy Facturación working right now?
At the last check (September 28, 2026, 08:45 UTC) the endpoint was working, answering in 1552ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Notsy Facturación safe to connect to Muse?
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.
What can Notsy Facturación do in Muse?
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."
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