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MCP server · Documentation

Mexican Tax & Banking

by · github.com/OrtaMarco/mx-fiscal-mcp-server

Validate RFC, CURP, CLABE and NSS, read CFDI 4.0 invoices and check their SAT status. No keys.

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Scored a month ago · breakdown

About Mexican Tax & Banking

Mexican Tax & Banking is an MCP server published by OrtaMarco in the Documentation category: validate RFC, CURP, CLABE and NSS, read CFDI 4.0 invoices and check their SAT status. No keys.

Recent commit activity is the strongest signal that reported issues will get attention.

Install

Claude Code
claude mcp add mexican-tax-banking -- npx -y mx-fiscal-mcp-server
npx
npx -y mx-fiscal-mcp-server

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

Tools (4)

validate_clabe18-digit CLABE with the correct 3-7-1 control digit — each weighted product counts only its **last digit** (`9 × 7 = 63` counts `3`), not the Luhn-style sum of its digits (`6 + 3 = 9`) many implementations copy — plus the Banxico bank and the plaza code

Parameters not published.

validate_curp18-character CURP with the base-37 check digit; decodes birth date, sex, state (RENAPO keys, *not* INEGI/ISO) and the century marker

Parameters not published.

validate_nss11-digit IMSS number with its Luhn digit, split into subdelegación / registration year / birth year / serial

Parameters not published.

validate_rfcRFC for individuals (13 chars) and companies (12), full modulus-11 check digit, parsed fields, birth/incorporation date. Flags the SAT generics and says which of them satisfies the arithmetic

Parameters not published.

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Security checks

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Releases

v1.0.0v1.0.0 · 14 Sep 2026First release. MCP server for Mexican tax and banking data. Read-only, no API keys required. 8 tools: `validate_rfc`, `validate_curp`, `validate_clabe`, `validate_nss`, `generate_test_data`, `parse_cfdi`, `cfdi_status`,…
v1.0.2v1.0.2 · 14 Sep 2026Fixed `cfdi_status`: `ValidacionEFOS` is now read against the table the SAT publishes (*Documentación del Servicio de Consulta de CFDI* v1.4, section 3). Codes `102` and `103` no longer report the issuer as listed under article 69-B — they…
v1.0.1v1.0.1 · 14 Sep 2026Fixed `validate_rfc`: for the SAT's generic RFCs (e.g. `XAXX010101000`), `expected_check_digit` now reports the digit computed by modulo 11 (`4`) instead of echoing the digit as written — which contradicted `check_digit_satisfied`.…
Questions

About Mexican Tax & Banking

How do I install Mexican Tax & Banking?

Run claude mcp add mexican-tax-banking -- npx -y mx-fiscal-mcp-server, then add the server to your MCP client's configuration.

Is Mexican Tax & Banking safe to use with an AI agent?

Its trust score is 37 out of 100 (low). Conduid hasn't run static security checks on this repository yet, so review the source yourself before granting it credentials. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Mexican Tax & Banking still maintained?

Yes — the latest release is v1.0.0 (14 Sep 2026), and the last commit was a month ago. The repository has 0 stars.