A mature, profitable phone validation SaaS generating $40.9K/mo with excellent 57% margins and a below-market 3.3x profit multiple. Eight years of operating history, verified financials, and a recognizable domain provide credibility. The pay-as-you-go model offers some customer stickiness, though concentration risk and churn transparency are critical unknowns that prevent a higher score.
The core software—a phone validation API with batch processing and credit-based billing—is reproducible by a solo founder using Twilio or similar phone APIs, a FastAPI backend, Stripe for billing, and PostgreSQL. Build cost: $18K–$45K (AI subscriptions, managed hosting, third-party APIs). Build time: 14–18 weeks to MVP parity. However, the acquisition value lies almost entirely in proven traction: $40.9K/mo recurring validated profit, 57% margins, 8-year customer relationships, a premium domain, and established brand authority with businesses and agencies. The buyer acquires immediate cash flow, verified customer base, operational knowledge, and years of market credibility that would take a solo founder 2–3 years to replicate organically. Customer churn, concentration, and growth trajectory must be verified independently, but the verified profit, margins, and valuation multiple strongly favor acquisition over rebuild.
Cash estimate includes the AI tools, APIs and infrastructure needed for a solo founder to recreate the software. Build time is informational and lightly weighted. The verdict is driven mainly by customers, users, verified earnings, retention, distribution, brand, data and operating history.
This listing is for a SaaS business that provides a cloud-based phone number validation platform that helps businesses, apps, and marketing agencies to improve the quality of their customer contact data before using it for sales, marketing, customer support, and fraud prevention. Originally launched in 2005 as a simple online lookup tool, this well-known brand has a much sought-after domain name and transitioned into a commercial SaaS platform in 2018 by introducing enterprise-grade batch processing, followed by API functionality. Since 2020, the business has operated almost entirely as a pure B2B SaaS company with a small additional affiliate revenue line. The business operates on a pay-as-you-go usage model rather than subscriptions, with customers purchasing credits based on their processing needs. Customers are exclusively businesses, primarily software providers, marketing agencies, CRM users, and other organisations that require high-quality contact data to improve operational efficiency and customer communications. The business is highly automated and operates without employees. Software development is outsourced to a long-term contractor who has supported the platform for many years and is available to assist with the post-acquisition transition. Disclaimers: If the Buyer has a legal entity in the same country as the Seller, then the Stripe account can be transferred. If the Stripe account cannot be handed over, there is a manual process for transferring customers, facilitated by EF and Stripe Support. There is a small risk that not all customers will migrate correctly. All personal expenses have been added back in the P&L (Owner salary, owner taxes, health insurance, etc). All Web Development and Web maintenance fees have been added back, as the seller notes that they have been aggressively building out new features and integrations. The seller has invested over $175K in service upgrades, including the build-out of integrations for Go High Level, HubSpot, Zapier, Make.com and (in progress) Zoho. In place of the above, the seller has estimated a monthly development cost of $1,800 per month, which represents ongoing support to maintain the platform as is - this can be seen in the expense section of the P&L and is not added back. Owner works ~5 hours/week. Reason for sale: The Seller is planning to retire. Growth opportunities: Publishing authority-building blog content through a custom CMS and new footer blog navigation; Creating integration splash pages, setup guides, and sitewide footer navigation; Building a Stripe Marketplace integration to expand platform compatibility; Exploring reseller services through legal assessment and customer demand validation
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Preliminary screening based on marketplace and public data. Verify all financial, legal, technical, customer, and operational claims independently before making an acquisition decision. This is not financial or legal advice.