I built free email, phone & card validators + a tiny hosted API (with real MX deliverability)

Short summary

Developer built and published free validators for email (real MX-record deliverability checks, not regex-only), phone (35+ countries), and credit cards (Luhn + brand detection), bundled with a REST API and SEO analyzer, all running cost-free on Cloudflare Workers with no paid dependencies. The tools offer transparent limitation disclosures (MX estimates, card format-only, phone prefix-based). Author is exploring what features would justify paid tier adoption.

• •Email validator includes real MX-record checks, disposable detection, typo suggestions, and deliverability estimation
• •Phone and card validators handle 35+ countries and Luhn checksums; all tools available as free REST API with CORS on Cloudflare Workers
• •Author actively seeking feedback on monetization strategy and what premium features users would pay for

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