Get your SRI en Línea comprobantes through an API

What you can build on SRI en Línea

• Get comprobantes electrónicos recibidos

  Build this

  Reads the list on Comprobantes electrónicos recibidos for one Periodo emisión and Tipo de comprobante, under Facturación Electrónica.

  Takes

  Year, month, day (optional), tipo de comprobante

  Returns

  Issuer RUC and razón social, type and series, clave de acceso, authorization date and time, issue date, valor sin impuestos, IVA, importe total

• Get comprobantes electrónicos emitidos

  Build this

  Reads the authorized comprobantes your RUC issued on one Fecha emisión, filtered by Tipo de comprobante, Establecimiento and Punto de emisión.

  Takes

  Issue date, tipo de comprobante, establecimiento (optional), punto de emisión (optional)

  Returns

  Type and series, clave de acceso, authorization date and time, issue date, valor sin impuestos, IVA, importe total

• Check a comprobante by clave de acceso

  Build this

  Looks up one clave de acceso on Validez de comprobantes and reads whether the comprobante is authorized.

  Takes

  Clave de acceso

  Returns

  Clave de acceso, authorization status

• Upload the monthly ATS

  Build this

  Opens Anexos, chooses the Anexo Transaccional Simplificado and sends the ATmmaaaa.zip file for one period.

  Takes

  Year, month, ATS zip file

  Returns

  Period, file name, result message

Automate SRI en Línea with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• New comprobantes recibidos, sent to accounts payable

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  Get the comprobantes electrónicos recibidos of type Factura for the current and the previous month.

  Step 2

  Keep the facturas that were not there on the last run.

  Step 3

  Post each one, with issuer RUC, clave de acceso, IVA and importe total, to your ERP webhook.

• Last month's IVA totals, before the declaración

  Build this

  Starts

  Monthly on the 2nd at 8:00

  Step 1

  Get last month's comprobantes recibidos of type Factura, and the comprobantes emitidos for each day of that month.

  Step 2

  Add up valor sin impuestos, IVA and importe total for purchases and for sales.

  Step 3

  Email you both totals with the list of comprobantes behind them.

• Supplier facturas checked before payment

  Build this

  Starts

  When your system calls the workflow's webhook with a list of claves de acceso

  Step 1

  For each clave de acceso, check the comprobante on Validez de comprobantes.

  Step 2

  Keep the ones that are not authorized.

  Step 3

  Post the clave de acceso and status back to your webhook.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get comprobantes electrónicos recibidos” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "srienlinea.sri.gob.ec/get_comprobantes_recibidos",
    "input": {
      "year": 2026,
      "month": 11,
      "tipo_comprobante": "Factura"
    }
  }'

{
  "status": "completed",
  "data": {
    "periodo": "2026-11",
    "tipo_comprobante": "Factura",
    "comprobantes": [
      {
        "ruc_emisor": "1799999999001",
        "razon_social_emisor": "NORTHWIND SUMINISTROS S.A.",
        "tipo_y_serie": "Factura 001-003-000004567",
        "clave_acceso": "1011202601179999999900120010030000045671234567819",
        "fecha_hora_autorizacion": "2026-11-10T09:14:52",
        "fecha_emision": "2026-11-10",
        "valor_sin_impuestos": 1250,
        "iva": 187.5,
        "importe_total": 1437.5
      }
    ],
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

SRI en Línea’s own options

The SRI publishes web services for issuers: one receives comprobantes electrónicos, one returns their authorization, and a consultation service gives a comprobante's status by clave de acceso. The ficha técnica describes no web service that lists the comprobantes you received. Annexes such as the ATS are prepared as XML files and sent through SRI en Línea.

Read on November 12, 2026: Ficha técnica, comprobantes electrónicos, esquema offline 2.34, Guía para contribuyentes: comprobantes electrónicos, Internet, Formularios e instructivos (DIMM, ATS).

Signing in to SRI en Línea

SRI en Línea signs you in with your RUC, cédula or passport number and your Clave, with an optional C.I. adicional field, and no second step is described in the SRI's guide. With Fous you sign in once through SRI en Línea's own sign-in with your own account: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

One period and one type at a time

Comprobantes electrónicos recibidos is queried by Periodo emisión and one Tipo de comprobante, so facturas and comprobantes de retención are separate calls. The RUC search and the clave de acceso search are mutually exclusive.

Authorization can take up to 24 hours

The SRI gives itself up to 24 hours after RECIBIDA to authorize a comprobante. A factura dated yesterday can appear today, which is why a comparison with the last run is safer than a query for one day.

The ATS is one zipped XML a month

The annex puts the matriz and every sucursal in one XML file, zipped as ATmmaaaa.zip, and only the zipped file is accepted online. SRI offices take a flash drive only for annexes over 8 MB when online channels are unavailable.

IVA due dates follow the ninth digit of the RUC

Monthly IVA returns are due on the 10th to the 28th of the following month, by the ninth digit of the RUC. A due date on a weekend or holiday moves to the next business day.

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