Fingerprint a public page so agents can detect changes: final url, etag, lastModified, sha256 contentHash of normalized visible text, raw byteLength, and fetchedAt. POST JSON {"url":"https://example.com"}. Public http(s) only; private hosts blocked. $0.04 USDC on Base (eip155:8453). No API key.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.04 USDC | 0xfE23...7706 |