CFDI Validation API

Integrate tax validation into your systems. REST API with bilingual JSON responses.

Base URL: https://herramientasfiscales.mx

Anonymous

3 req / day

No registration

With API Key

50 req / month

Free, request below

Pro

10,000 req / month

$499 MXN/month + VAT — Pro Plan

Endpoints

valid

boolean — true if no errors

cfdiInfo

Issuer, receiver, total, date data

issues[].severity

"error" | "warning" | "info"

issues[].code

SAT code (CRP20265) or custom (EQUIV_DR_INCORRECT)

issues[].message

Bilingual explanation in natural language

issues[].howToFix

Concrete fix steps

issues[].autoFixable

true if auto-fixable

issues[].isRootCause

true if root cause of other errors

http

X-RateLimit-Limit: 100
X-RateLimit-Remaining: 99
X-RateLimit-Reset: 2026-03-30T23:59:59Z
X-Tier: free

200Validation successful (check valid field)

400Invalid request (empty XML, wrong format)

401Invalid or inactive API key

413File too large (max 10MB)

429Rate limit exceeded

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