ZelNum vs Fax for Agents

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

ZelNum compared with Fax for Agents
Detail	ZelNum	Fax for Agents
What it does	Phone number, carrier, and messaging app verification platform for contact list cleaning and fraud review	A fax API and MCP server for AI agents to send and receive faxes with receipts
Stage	Not given	Not given
Founded	Not given	2023
Based in	EE	US
Pricing model	Paid	Paid
Pricing	Pay-as-you-go prepaid credits. WhatsApp: $0.5 per 10,000 lookups (bulk) or $0.008 per lookup (realtime). Telegram: $1.5 per 10,000 lookups (bulk) or $0.012 per lookup (realtime). HLR Lookup: $4 per 10,000 lookups. Carrier Lookup: $4 per 10,000 lookups. No subscription, minimum order 500–2,000 depend	$0.039 per page sent, $0.019 per page received, $2 per fax number per month, $10 minimum wallet top-up, optional Agent workspace $19 per month, sandbox free. Prices as of 2026-10-28.
Key features	Bulk CSV/TXT file upload and processing VoIP and disposable number detection Real-time single lookups and batch API jobs	Document preparation with PDF, image and text rendering Price quotes bound to document, destination and sender Authorization by person or delegated policy Bounded retries with circuit breaker per route Private inbox for received faxes with signed URLs Idempotent API calls with Idempotency-Key header Signed webhooks with event IDs Sandbox for free testing before production Document retention with 30-day default and deletion option
What makes it different	45 verification tools in one workflow covering phone, carrier, messaging apps, and social platforms Global coverage across international phone datasets and carrier networks Pay-as-you-go credits with no subscription, minimum commitment, or recurring fees Scalable from free single lookups to bulk API workflows and high-volume batch jobs	Every fax send produces a receipt with provider evidence of delivery Agents cannot exceed their own permissions or budget limits International fax coverage to 213 destinations with transparent pricing MCP server with 15 tools for seamless agent integration Per-page pricing with no minimum subscription requirement
Community votes	0	0
DR (Domain Rating by Ahrefs)	18 +1 (up) since last check	22 +2 (up) since last check
Trust Flow (Majestic)	15	0
Citation Flow (Majestic)	29	0
Referring domains (Majestic)	19	0

6 details filled in for both companies.

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