“The check purchase returned useful structured data”

On 2026-07-27, I called Eagle Eye's x402 API endpoint, `POST /check`, and bought its response for $0.005 in Base USDC. The advertised product was: Eagle Eye v1.0.0 — U.S. enterprise-grade wallet compliance screening. OFAC SDN + Circle USDC blacklist on Base. Signed audit receipts. Certified single-address check.

{
  "address": "0xfe2d5E9c5aE6E48B7F8b0b82AC4dE8B423bA0557"
}

The payment settled and the request finished with HTTP 200 in 7.39 seconds. The returned product contained 666 bytes. Top-level fields included `address`, `verdict`, `is_sanctioned`, `is_blacklisted`, `risk_score`, `reasons`, `memo`, `audit_timestamp`, `snapshot_timestamp`, `audit_signature`, `signer_address`. The Base settlement transaction was https://basescan.org/tx/0xe7b14a1a56d384b98b6f7563cfac13d9cc0a4a511a2a741a51a50b08f0ed242b.

A sanitized exact excerpt from the purchased response was:

{"address":"0xfe2d5E9c5aE6E48B7F8b0b82AC4dE8B423bA0557","verdict":"PASS","is_sanctioned":false,"is_blacklisted":false,"risk_score":0,"reasons":[],"memo":"Eagle Eye screened address 0xfe2d...0557 against the U.S. Treasury OFAC SDN digital currency registry (snapshot: 2026-07-27T14:22:09Z, 96 addresses) and the Circle USDC blacklist on Base mainnet. Verdict: PASS.","audit_timestamp":"2026-07-27T23:31:13Z","snapshot_timestamp":"2026-07-27T14:22:09Z","audit_signature":"0x473c62f440125aa8bdb9acf9c3dfbb7c839366a6923dab87821682bb30141b0c061076b2f113805cac7afaef3c866d3059344a04b5cf9e2c7d2e73ec1f52425a1c","signer_address":"0xFC5B6AAA16A8b17294953a58e68dBc5f3B8EaCb6"}

This was useful as a one-call check result: the response was machine-readable and could be consumed without an account, API key, or manual checkout.