# Mexico Supplier RFC Precheck (SAT 69-B EFOS Lookup)

> Mexico Supplier RFC Precheck (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, $0.02/call, status unknown (last checked 2026-10-31).

Validates a Mexican RFC identifier and checks whether the supplier appears on the SAT 69-B EFOS blacklist, returning a pass/fail verdict with detailed compliance status.

## Facts

- Endpoint: GET https://mexico-agent-toolkit.spain-agent-toolkit.workers.dev/v1/mx/supplier/precheck?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mexico-supplier-rfc-precheck-sat-69-b-efos-lookup-f186c1f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EpUlHe6-HPcBSKBED5kxn

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mexico-supplier-rfc-precheck-sat-69-b-efos-lookup-f186c1f1
```

Example prompt: Can you check if the Mexican supplier with RFC EKU9003173C9 is valid and not listed on the SAT 69-B EFOS blacklist before we process their invoice?

## When to prefer this

Use this endpoint when you need to screen a Mexican supplier's RFC for compliance with SAT regulations before processing payments or onboarding vendors. It combines offline RFC format validation with a live lookup against the SAT 69-B EFOS blacklist in a single pay-per-call call requiring no API keys or account setup. Ideal for AI agents running automated accounts-payable or procurement workflows involving Mexican counterparties.

## Known failure modes

- RFC not provided or malformed (not 12–13 characters) — returns validation error
- RFC structurally invalid — rfcCheck.valid returns false with reason
- RFC listed on SAT 69-B — verdict reflects flagged status and situation field populated
- Network or worker error — HTTP 5xx response
- Payment not received via x402 — HTTP 402 Payment Required before data is returned

## 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 queried RFC, a top-level verdict ('ok' or flagged), an issues array listing any problems found, rfcCheck object with validity flag and entity type (persona_moral or persona_física), and sat69b object with a listed boolean and situation field describing any EFOS classification. All checks are performed using offline RFC validation logic and the latest SAT Listado 69-B open dataset (cut-off 2026-09-30).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "rfc"
     ],
     "properties": {
      "rfc": {
       "type": "string",
       "description": "Supplier RFC (12 or 13 characters)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rfc": "EKU9003173C9",
  "issues": [],
  "sat69b": {
   "listed": false,
   "situation": null
  },
  "verdict": "ok",
  "rfcCheck": {
   "type": "persona_moral",
   "valid": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mexico-supplier-rfc-precheck-sat-69-b-efos-lookup-f186c1f1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mexico-agent-toolkit.spain-agent-toolkit.workers.dev](https://www.zero.xyz/host/mexico-agent-toolkit.spain-agent-toolkit.workers.dev/llms.txt)