🌮 MadTaco MCP — verification and trust checks for AI agents.

Validate tax IDs, IBANs, emails, and phones.

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Validate Tax Id: Validate a tax ID format and checksum (CL RUT, MX RFC, and more). Free — 0 credits.
  • Validate Iban: Validate an IBAN checksum and parse bank metadata. Free — 0 credits.
  • Validate Email: Validate an email address. mode syntax is free; mode full costs 0.005 credits (tier 2).

What data it sees

Do you need an account

No: the server works without sign-in

Validate tax IDs, IBANs, emails, and phones. Screen entities against sanctions lists (OFAC, EU, UK, UN). Verify companies, inspect domains, and run composite trust screens. Create accounts, check usage, and propose new capabilities.

Free tools (tax-id, IBAN, email syntax, phone format, Chilean indicators) work without an API key. Paid checks need a funded MadTaco account — authenticate with your API key via X-Api-Key.

Every response includes credits_charged; failed checks are never billed.

Setup: madtaco.dev/mcp API docs: madtaco.dev/docs Pricing: madtaco.dev/pricing.json

How to connect

How to connect 🌮 MadTaco MCP — verification and trust checks for AI agents. to Claude

The server address to paste into Claude settings:

https://madtaco-mcp--madtaco.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect 🌮 MadTaco MCP — verification and trust checks for AI agents. to ChatGPT

The server address to paste into ChatGPT settings:

https://madtaco-mcp--madtaco.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect 🌮 MadTaco MCP — verification and trust checks for AI agents. to Cursor

The server address to paste into Cursor settings:

https://madtaco-mcp--madtaco.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (12)

Raw names from tools/list. Only developers need these.

validate_tax_idValidate a tax ID format and checksum (CL RUT, MX RFC, and more). Free — 0 credits.
validate_ibanValidate an IBAN checksum and parse bank metadata. Free — 0 credits.
validate_emailValidate an email address. mode syntax is free; mode full costs 0.005 credits (tier 2).
validate_phoneValidate a phone number. mode format is free; mode full costs 0.005 credits (tier 2).
screen_sanctionsScreen a name against OFAC SDN, EU, UK, and UN sanctions lists. Costs 0.10 credits (tier 2). Requires API key on the MCP request.
verify_companyVerify a company against an official registry (GB only in v1). Costs 0.15 credits (tier 2). Requires API key on the MCP request.
inspect_domainInspect domain age, DNS posture, and lookalike risk. Costs 0.05 credits (tier 2). Requires API key on the MCP request.
screenRun a composite trust screen across sanctions, registry, domain, email, and phone checks. Only completed checks are charged. Requires API key on the MCP request.
propose_checkPropose a new check capability MadTaco does not offer yet. Optionally pledge credits (held, not charged). Requires API key on the MCP request.
create_accountCreate a MadTaco account (agent-native signup). A 6-digit verification code is emailed — no API key yet.
verify_accountVerify the emailed 6-digit code and receive an API key (tier registered).
get_usageGet today usage totals, per-operation counts, credits spent, and balance. Optional period=7d|30d for daily breakdown. Requires API key on the MCP request.