SEO and keyword data API with 44 routes, paid per call over x402 in USDC on Base
Stage
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Founded
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Based in
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NL
Pricing model
Freemium
Paid
Pricing
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
Prices per call range from $0.012 to $0.25 in USDC on Base. Keyword overview: $0.04. Search volume: $0.04. Keyword ideas: $0.04. Related keywords: $0.04. Keyword variations: $0.04. Keyword difficulty: $0.04. Search intent: $0.04. Keyword volume history: $0.048. Keyword suggestions: $0.04. Google Ads
Key features
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
Keyword research with search volume, CPC, difficulty, intent and ideas for up to 100 keywords per call
Domain overview, traffic estimates and ranked keywords for up to 100 domains
Backlink profile data including referring domains and anchor texts with 24-month history
On-page SEO audit and Lighthouse page speed analysis for individual URLs
Amazon keyword ideas and search results across multiple regional stores
Brand mention tracking and AI answer visibility monitoring
Website technology stack and WHOIS domain registration data
No account, API key or subscription required; pay per call in USDC on Base blockchain
What makes it different
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
Pay-per-call pricing in USDC stablecoin on Base blockchain with no account setup required
44 routes across 9 data families covering comprehensive SEO and keyword research data
RFCCheck