A fax API and MCP server for AI agents to send and receive faxes with receipts
Validate Mexican RFC numbers via API
Stage
Not given
Not given
Founded
2023
Not given
Based in
US
Not given
Pricing model
Paid
Freemium
Pricing
$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.
Pay as you go: $0.015 USD per credit (prepaid, no subscription). Monthly plans: Basic $99/month for 10,000 credits, Growth $449/month for 60,000 credits, Pro $1,800/month for 300,000 credits. Enterprise: volume pricing available on request. /sat-lists endpoint is free on any plan. New users get $5 U
Key features
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
Full RFC validation with registration status, name, postal code, and digital certificates
Taxpayer profile lookup with personal data and contact information
Postal code lookup for CFDI invoicing
Quick verification with single SAT roundtrip in 1-2 seconds
Compliance checking against SAT contributor lists (Articles 69, 69-B, 69-B Bis)
Bulk verification of up to 5000 records in one call
Digital certificate lookup with serial numbers and validity dates
Commerce registry lookup for company legal regime and shareholders
What makes it different
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
Directly connected to SAT database for real-time validation
Supports both individual and business RFC numbers with automatic type detection
Shared account and balance with CURP and voter ID validation services
Fax for Agents
RFCCheck