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Mexico RFC Validator with SAT 69-B EFOS Lookup
x402
Mexico RFC Validator with SAT 69-B EFOS Lookup is a paid API for AI agents from mexico-agent-toolkit.spain-agent-toolkit.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Validates a Mexican RFC number offline and checks if the entity appears on the SAT 69-B (EFOS) tax offender list
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-per-call Mexico utilities for AI agents over x402 (USDC on Base). No accounts, no API keys. Mexican RFC validation (offline) and SAT 69-B (EFOS) lookup by RFC. Data: SAT, Listado completo 69-B, datos abiertos (Libre Uso MX), cut-off 2026-09-30. Not an official SAT service and not endorsed by the SAT. / No es un servicio oficial del SAT ni está avalado por el SAT. Privacy notice: /privacy
Output
Returns a JSON object with: the RFC type (persona_moral for 12-char or persona_física for 13-char), overall validity boolean, individual check results (format, date, checkDigit), the normalized RFC string, and SAT 69-B listing status including whether they are listed, their EFOS situation if listed, and the data cutoff date (2026-09-30).
Example use cases
Supplier onboarding compliance check
“Before I add this new Mexican supplier to our system, can you validate their RFC 'AAA010101AAA' and confirm it's not blacklisted on the SAT 69-B EFOS list?”
Detect fake RFC in a form submission
“A user submitted the RFC 'XAXX010101000' on our registration form — can you check if that RFC is structurally valid and whether it belongs to a persona física or persona moral?”
Tax invoice verification for accounting
“I have an invoice from a Mexican vendor with RFC 'CMT800101M19' — please verify if the RFC format and check digit are correct and whether they're flagged as a tax offender by SAT.”
Technical details
Endpoint
GEThttps://mexico-agent-toolkit.spain-agent-toolkit.workers.dev/v1/mx/rfc/validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate Mexican RFC numbers without setting up an account or obtaining API keys — ideal for pay-per-call agent workflows. It is the right choice when you need both offline RFC structural validation and a real-time SAT 69-B EFOS compliance check in a single call. Prefer this over manual lookups or scraping the SAT portal when building automated supplier onboarding, invoice verification, or KYC pipelines for Mexican entities.
Side effects
- Missing or malformed RFC query parameter returns an error
- RFC shorter or longer than 12-13 characters will fail format check
- Homoclave errors cause checkDigit check to fail
- EFOS data may be stale relative to the stated cutoff if the service hasn't updated
- Non-Mexican tax IDs will return invalid
- Payment failure via x402 protocol blocks access to the endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "persona_moral",
"valid": true,
"checks": {
"date": true,
"format": true,
"checkDigit": true
},
"sat69b": {
"listed": false,
"situation": null,
"dataCutoff": "2026-09-30"
},
"normalized": "EKU9003173C9"
}
}Tags
x402
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