ContactLint Terms of Service

Last updated: October 12, 2026

ContactLint is a trade name of Crypto Boutique LLC.

These terms are an agreement between you and Crypto Boutique LLC, a Missouri limited liability company doing business as ContactLint ("ContactLint", "we", "us"). They cover the website at contactlint.com, the ContactLint API, the MCP server, and any API keys and credits (together, the "Service"). By creating an API key or using the Service, you agree to these terms. If you use the Service for a company, you confirm you can bind that company.

Contact: support@contactlint.com

1. What ContactLint does

ContactLint checks email addresses and phone numbers you send it and returns the results.

• Email checks: syntax, whether the domain has mail (MX) or address (A) records, looked up through Cloudflare DNS-over-HTTPS, whether the domain is on a disposable-email list, whether the address is a role address (such as admin@ or info@), and whether it uses a free mail provider. ContactLint never connects to the mailbox and does not confirm that a mailbox exists or that a person will receive mail.
• Phone checks: parsing with libphonenumber data, valid and possible flags, line type and region where the data supports it, and E.164, national and international formats. Carrier lookups are not offered today; if they are added, they will be described here first.
• Access: an HTTP API at contactlint.com/v1 and an MCP server at contactlint.com/mcp, both using your API key.

2. API keys and accounts

• You get an API key at contactlint.com/signup. It is shown once. We store only a hash of it, so we cannot show it again; keep it safe.
• You are responsible for all use of your keys. Tell us right away if a key is exposed so we can disable it.
• Limits to prevent abuse: up to 3 keys per email address, signup rate limits, a verification challenge, and no disposable email addresses at signup. We may change these limits.

3. Free tier, credits and payment

• Free: 100 checks per key per calendar month, no card required. Unused free checks do not roll over.
• Credit packs: 5,000 checks for $9, 25,000 for $35, and 100,000 for $99. Credits are used after the monthly free checks run out. One check is one API or MCP call to a validation tool.
• Payments are processed by Stripe. We do not see or store your full card number.
• Refunds. Credits that have been used are non-refundable. Unused credits are refundable within 14 days of purchase; email support@contactlint.com to request it.
• Prices may change; changes do not affect credits you already bought.

4. Acceptable use

You agree not to:

• Use the Service to build lists for spam, or to check addresses or numbers you have no lawful reason to process.
• Try to get around rate limits, free-tier limits or signup limits (for example by creating many keys).
• Probe, overload or attack the Service, or resell raw access to the API without our written OK.
• Send data you are not allowed to share, such as sensitive data unrelated to contact validation. You are responsible for complying with laws that apply to you, including anti-spam, telemarketing, and data protection laws, when you use the results.

Rate limit: 60 requests per minute per key. Requests over the limit get an error. We may change this limit.

5. Results are best effort; no guaranteed accuracy

Validation results are based on public DNS records, open-source lists and phone metadata at the time of the check. They can be wrong or out of date. A "valid" result does not mean an email will be delivered or a phone will be answered, and an "invalid" result may be wrong. Do not use results as the only basis for decisions that seriously affect a person. The Service is provided "as is" and "as available", without warranties of any kind, to the fullest extent the law allows.

6. Availability and changes to the Service

We aim to keep the Service available. We may change, add or remove features, endpoints or limits. For changes that break the API, we will try to give notice on the site or by the contact method you gave us.

7. Suspension and termination

You can stop using the Service at any time. We may suspend or disable a key that breaks these terms, puts the Service at risk, or is used for abuse, with or without notice.

8. Ownership

We own the Service, its code, documentation and brand. You own the data you send us and the results we return to you. Third-party data sources keep their own licenses (disposable-email-domains, CC0 1.0; libphonenumber-js, MIT).

9. Limitation of liability

To the fullest extent the law allows, we are not liable for indirect, incidental, special or consequential damages, or for lost profits, revenue or data.

10. Indemnity

You agree to cover our reasonable costs if a claim is made against us because of how you used the Service or its results, or because of data you sent without the right to do so.

11. Governing law

These terms are governed by the laws of the State of Missouri.

12. Changes to these terms

We may update these terms. The "Last updated" date will change. Using the Service after a change means you accept the new terms.

13. Other

If any part of these terms is not enforceable, the rest still applies. Not enforcing a term is not a waiver. You may not assign these terms without our written consent.

Questions: support@contactlint.com