About looktwice-mcp
looktwice-mcp is an MCP server for the LookTwice API, offering email, EU VAT, IBAN, and domain checks plus U.S. CPSC recall screening. It returns evidence with timestamps and official sources, while distinguishing checks from claims about mailbox or account existence, safety, or compliance.
Key features
- 01Check email syntax and signals
- 02Validate EU VAT numbers live
- 03Check IBAN structure and checksum
- 04Inspect domain DNS, TLS, and more
- 05Match CPSC recalls and warnings
Use cases
- 01Check email addresses during registration or transactions
- 02Verify EU business VAT details
- 03Check IBAN format and domain status
- 04Screen products for CPSC recall matches
MCP support
As an MCP server for the LookTwice API, it exposes email, VAT, IBAN, domain, and CPSC screening tools, as well as a credit-balance lookup.
Configuration
Local server config is the same for every client. Copy it into your client’s MCP config file.
npx -y looktwice-mcpLOOKTWICE_API_KEYSecretLookTwice API key; create one at https://looktwice.dev/dashboardLOOKTWICE_BASE_URLOverride the API base URL (defaults to https://api.looktwice.dev)Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.
Tools
6Saved tool list · updated 2w ago
| Parameter | Type | Required | Description |
|---|---|---|---|
| string | Yes | The email address to check |
Details
From the project READMElooktwice-mcp
MCP (Model Context Protocol) server for the LookTwice API. Validate emails, EU VAT numbers, IBANs, and domains, and screen products against U.S. CPSC recalls and Product Safety Warnings — directly from Claude Desktop, Cursor, or any MCP client.
npx -y looktwice-mcp
Setup
- Create a LookTwice account at looktwice.dev — verified accounts receive 100 free API units each month, no credit card required.
- Create an API key in the dashboard.
- Add the server to your MCP client configuration:
{
"mcpServers": {
"looktwice": {
"command": "npx",
"args": ["-y", "looktwice-mcp"],
"env": {
"LOOKTWICE_API_KEY": "lt_live_..."
}
}
}
}
Tools
| Tool | What it does | Cost |
|---|---|---|
email_check | Syntax, MX, disposable, role, free-provider signals (no mailbox probing) | 2 units |
vat_check | Live EU VIES validation with returned business data and request evidence | 1 unit |
iban_check | Country structure, length, and MOD-97 checksum (no account-existence claim) | 1 unit |
domain_check | DNS, MX, TLS, and RDAP state for a registrable domain | Free quota |
cpsc_recall_match | Evidence-backed candidate matching against CPSC recalls and warnings | 3 units |
credits_balance | Current workspace credit balance | Free |
Compared with a single-purpose MCP
Most VAT or email MCP servers wrap one upstream. This server keeps the same evidence rules across email, VIES, IBAN, domain, and CPSC: timestamps, official sources, and no mailbox / account / safety claims.
Honest boundaries
email_checknever claims a mailbox exists (mailbox_status: not_checked).iban_checknever claims an account exists or belongs to a person.cpsc_recall_matchreturns screening candidates with official sources, not safety, legality, or compliance decisions.
Environment variables
| Variable | Required | Default |
|---|---|---|
LOOKTWICE_API_KEY | Yes | — |
LOOKTWICE_BASE_URL | No | https://api.looktwice.dev |
License
MIT
Comments
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.