🇵🇾 Paraguay Invoice MCP live

AI agents can now issue a Paraguay factura electrónica (Documento Electrónico for SIFEN / e-Kuatia). This remote MCP server wraps FacturaSend — which generates, digitally signs and transmits the DE to the DNIT — with three tools: create_invoice, query_invoice (by cdc or id), and get_document_status (live SIFEN estado). It only forwards the calls and does the local IVA math: signing and SIFEN transmission stay inside your own FacturaSend account.

Connect

{
  "mcpServers": {
    "paraguay-invoice": {
      "type": "http",
      "url": "https://inv-py.wishpool.app/mcp",
      "headers": {
        "x-facturasend-tenant": "your-facturasend-tenant-id",
        "x-facturasend-key": "your-facturasend-api-key"
      }
    }
  }
}

Self-register free at facturasend.com.py — you can integrate before you have SIFEN production enrolment or a digital certificate. Required headers: x-facturasend-tenant + x-facturasend-key. Your certificate and SIFEN enrolment live in your FacturaSend account — this server never sees them.

How it works

• You describe, FacturaSend signs & sends: create_invoice takes the buyer (RUC/name), line items and IVA rate; the server does the local guaraní IVA math and posts the DE to /{tenant}/lote/create. FacturaSend signs it and transmits it to SIFEN, returning the 44-digit cdc and estado. It never signs here and stores nothing.
• Guaraníes are integer & tax-inclusive: PYG has no decimals — pass integer unit prices that already include IVA. IVA per line is 10 (standard), 5 (reduced) or 0 (exempt); the IVA portion is liquidated as price*10/110 or price*5/105.
• Free to test: create_invoice with draft=true builds the DE offline with no SIFEN transmission (no fiscal effect); a FacturaSend account wired to the DNIT test environment reaches the real SIFEN test gateway. Your account/timbrado decides test vs production.
• Status enums: get_document_status returns the SIFEN estado — Aprobado (fiscally valid), Aprobado con observación, or Rechazado — plus respuesta_codigo/respuesta_mensaje and numbered next_steps.

SIFEN e-Kuatia is being made mandatory

Paraguay's SIFEN (Sistema Integrado de Facturación Electrónica Nacional), branded e-Kuatia, is administered by the DNIT (formerly SET). Since 2022 the DNIT has incorporated taxpayers into electronic invoicing in successive obligatory groups (grupos), progressively covering all businesses — so issuing the Documento Electrónico instead of paper/pre-printed invoices is increasingly required. Check your assigned group and start date on the DNIT / e-Kuatia portal; with FacturaSend you can integrate and test ahead of your mandatory date.

Why it is safe

• Stateless: no database — your FacturaSend tenant id and API key travel per-request in headers and are never stored.
• Signing stays with you: the digital signature and SIFEN transmission happen inside your FacturaSend account; a compromise of this forwarder cannot forge or alter your invoices.
• Owner policy guardrails: x-agentpay-max-amount, x-agentpay-approval-above, x-agentpay-allowed-tools — set by the human owner in client config; the agent cannot relax them. The cap applies to the invoice grand total in guaraníes (PYG).

Sister servers

Invoices: Mexico CFDI inv-mx · Brazil NF-e inv-br · Chile DTE inv-cl · Peru CPE inv-pe · Argentina AFIP inv-ar · Costa Rica Hacienda inv-cr · Ecuador SRI inv-ec · Saudi ZATCA inv-sa · India GST inv-in · Poland KSeF inv-pl. Local payments in 81 countries, one family, same stateless pattern: mcp.wishpool.app (Taiwan e-invoice 電子發票 included).