x402 · USDC · no signup · no API key

Technical website intelligence agents can buy instantly.

Live inspection plus accumulated technical history. StateProbe keeps previous observations so buyers can ask what changed without maintaining their own snapshots.

History sampleSnapshot sampleOpenAPIAgent docsAPI status

Production products

Low-friction utility

HTTP Inspector

$0.005
USDC · Base mainnet · per request
  • HTTP status
  • Redirect chain
  • Response latency
  • Useful headers
GET /api/http-check?url=https://example.com
Current state

Website Snapshot

$0.015
USDC · Base mainnet · per request
  • HTTP + DNS
  • Security headers
  • SEO + technology
  • robots.txt + sitemap.xml
GET /api/site-intelligence?url=https://example.com
View free sample →
BETA · DATASET GROWING

Site History

$0.025
USDC · Base mainnet · per lookup
  • Technical timeline
  • DNS + nameserver changes
  • Security + stack changes
  • SEO + redirect changes
GET /api/site-history?domain=blackhawkjapan.com
Check free coverage →
View free history sample →
BEST VALUE

Evolution Forensics

$0.04
USDC · Base mainnet · per investigation
  • Preserved technical history
  • Fresh live scan now
  • Historical → current delta
  • Changed fields with before/after values
GET /api/site-evolution-forensics?domain=blackhawkjapan.com
Free purchase preview →
REPEATABLE

Change Feed

$0.02
USDC · Base mainnet · per feed pull
  • Latest detected changes
  • Cross-domain feed
  • Changed fields
  • Built for repeated agent polling
GET /api/change-feed?limit=20
Free availability preview →
ARCHIVE FORENSICS

Wayback Forensics

$0.04
USDC · Base mainnet · per investigation
  • Historical public web archive evidence
  • Current live technical state
  • Archive → current change analysis
  • SHA-256 evidence seals
GET /api/wayback-forensics?url=https://example.com
Free archive coverage preview →
Accumulating dataset

The history gets harder to reproduce every day.

175
snapshot index
Preserved capture points.
12
domains tracked
Initial technical-history cohort.
4×
captures / day
State accumulates without buyer calls.
Agent-native checkout

Discover → 402 → pay → JSON.

Use the free coverage endpoint before buying history. Production paid resources use Base-mainnet x402.

GET /api/site-history-coverage?domain=blackhawkjapan.com → free coverage
GET /api/site-history?domain=blackhawkjapan.com → 402 → USDC → JSON
GET /api/site-evolution-forensics?domain=blackhawkjapan.com → history + live scan + delta
GET /api/change-feed?limit=20 → recent detected changes across the corpus
GET /api/wayback-forensics?url=https://example.com → archive evidence + live state + integrity seals

Machine discovery

x402 manifest
Paid resource discovery JSON.
A2A agent card
Semantic capability discovery.
Capabilities
Budget-aware tool selection.