Find a postal code | RFC Validation API

POST /v1/rfc/find-zip

Recover the SAT-registered postal code for an RFC + name pair via SAT's massive consultation endpoint. Skips the cert lookup, so callers must provide a clean name. Completes in ~10-15s. Webhook supported.

Use this when an invoicing flow needs the zip code but the customer name is already on file. Skipping the cert lookup saves the ~1-3s profile step.

Request body

Field	Type	Required	Description
`rfc`	string	Yes	The RFC to look up.
`name`	string	Yes	SAT-registered taxpayer name. See Name formatting.
`webhook_url`	string	No	Optional URL for async delivery.

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POST /v1/rfc/find-zip

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Example request

curl bash

curl -X POST https://rfccheck.com/v1/rfc/find-zip \
  -H "x-api-key: rfc_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"rfc": "ACME010101AAA", "name": "ACME CONSULTORES"}'

Response (200)

200 OK json

{
  "rfc": "ACME010101AAA",
  "valid": true,
  "zip": "06600",
  "message": "RFC válido, y susceptible de recibir facturas"
}