RevClamp Enterprise vs SingleFax

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

RevClamp Enterprise compared with SingleFax
Detail	RevClamp Enterprise	SingleFax
What it does	B2B revenue assurance for Stripe and Shopify with automated unpaid usage protection, chargeback defense, and EU VAT compliance	Send one-time faxes online from $0.99, pay only if delivered
Stage	Not given	Not given
Founded	Not given	Not given
Based in	VN	US
Pricing model	Paid	Not given
Pricing	Free Audit: $0/month (up to 5,000 events/month); Starter: $19/month (up to 100,000 events/month); Growth: $59/month (up to 1,000,000 events/month); Scale: $199/month (up to 5,000,000 events/month)	One-time fax: from $0.99 for up to 10 pages, then $0.08 per extra page (max 1,000 pages), pay only if delivered. 30-day fax number: $4.99 one-time payment. Lifetime Basic fax number: $97 one-time payment. Lifetime Pro fax number: $147 one-time payment. Standard Plan (monthly): $6.58/mo or $79/year (
Key features	Detects canceled or past-due accounts still using your product and pauses access after a configurable grace window Stages Visa CE 3.0 chargeback evidence with 120-365 days of historical charges and 90 days of customer activity logs Validates buyer VAT IDs across 27 EU member states and Northern Ireland against official EU VIES servers Provides official audit trails and SHA-256 signed CSV exports for EU VAT compliance Handles VIES server outages by placing fulfillment on safe hold and retrying in the background Reconciles Shopify Plus B2B Net-Terms deposits with exact EUR-cent precision Native Model Context Protocol (MCP) server for AI agents to audit revenue and manage subscriptions Signed HMAC-SHA256 webhooks for account lock and restore with configurable grace periods Interactive demo simulators for testing unpaid access detection, chargeback defense, and EU VAT scenarios	Send faxes from browser, email, or mobile app Pay only if delivery succeeds Support for up to 1,000 pages per fax Timestamped delivery confirmation Searchable AI transcripts for received faxes HIPAA Secure workflow with signed BAA IRS form filing with carrier proof Chrome extension for PDF faxing
What makes it different	Flat-rate pricing with zero percentage overage fees, unlike per-transaction or metered billing models Non-destructive chargeback evidence staging with submit=false control, preserving merchant notes 2-minute setup via Stripe OAuth or Shopify App Store without complex code changes Agent-native MCP server enabling autonomous AI agents to manage revenue audits and entitlements	No account or subscription required for one-time faxes Pay only if fax delivers successfully Integrated IRS filing with official transmission proof Lifetime fax numbers with no monthly rental fees
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	25 no change since last check
Trust Flow (Majestic)	6	1
Citation Flow (Majestic)	33	27
Referring domains (Majestic)	18	36

5 details filled in for both companies.

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