URL intelligence for autonomous agents

Know what's behind a URL before your agent trusts it.

Proof402 turns public pages and x402 endpoints into compact, decision-ready JSON. No signup. No API key. One USDC payment per call.

Inspect endpointsAbout x402 ↗
SETTLEMENT< 1 sec
UPSTREAM COST$0
AUTHHTTP 402
OUTPUTJSON
Public URL onlyLocal targets blockedRedirect revalidationResponse cappedGas sponsored
Three focused tools

Sample for cents. Fix a launch for dollars.

Call normally. The first response tells any x402 client exactly how to pay and retry.

GET$0.05

/api/page-profile

Extract the signals agents need before ingesting or citing a page.

  • Final URL, status, and redirect chain
  • Title, description, canonical, and robots
  • OpenGraph and JSON-LD types
  • Internal and external link counts
curl -i "$PROOF402_URL/api/page-profile?url=https%3A%2F%2Fexample.com"
GET$0.25

/api/x402-audit

Probe a paid endpoint without paying it and grade the challenge it exposes.

  • Header and body challenge decoding
  • Scheme, network, price, and asset checks
  • Resource and discovery metadata checks
  • Machine-readable findings and score
curl -i "$PROOF402_URL/api/x402-audit?url=https%3A%2F%2Fapi.example.com%2Fpaid"
POST$12.00

/api/x402-launch-audit

Turn one unpaid endpoint observation into an actionable launch-readiness report.

curl -i -X POST "$PROOF402_URL/api/x402-launch-audit" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://api.example.com/paid"}'
01

Redirect-safe

Every redirect is revalidated. Private IP literals, local names, metadata hosts, and nonstandard ports are blocked.

02

Agent-native

JSON in, JSON out. The 402 challenge declares Base-mainnet USDC and a machine-readable Bazaar schema.

03

Pay per call

No account, subscription, API key, or invoice. Payment settles directly through x402.

Built for software, readable by humans

One request. One payment. One answer.

View call patterns