Free access to the directory API and MCP server. Listing a new API costs $0.25 USDC from October 26, 2026, which includes one real purchase verification.
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
Real USDC purchases to verify API delivery
Paid-verified status with Base blockchain transactions
Reputation scores from recency-weighted probe pass rates
Continuous endpoint probing every 2 minutes to 8 hours
Free discovery API with three-line pre-spend checks
MCP server integration with search and detail tools
Machine-readable catalogue in NDJSON format
Purchase outcome tracking and transaction visibility
Dispute resolution and result correction in public
Automatic payment address rotation detection
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
Only directory that pays with real USDC to verify delivery
Public ledger of all purchases and transactions on blockchain
Native MCP integration for AI agent workflows
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
nohumans.directory
RFCCheck