Agents handle your data.
Sentinel handles the privacy.

// 1. Agent calls /redact without payment
const res = await fetch("/api/v1/redact", {
  method: "POST",
  body: JSON.stringify({ text: transcript })
});

// 2. Server responds 402 with payment instructions
// X-Payment-Required: true
// X-Payment-Protocol: x402
// X-Payment-Amount: 0.003500
// X-Payment-Token-URL: /api/v1/payment/token

// 3. Agent obtains payment token
const { token } = await fetch("/api/v1/payment/token", {
  method: "POST"
}).then(r => r.json());

// 4. Agent retries with payment token
const result = await fetch("/api/v1/redact", {
  method: "POST",
  headers: { "X-Payment-Token": token },
  body: JSON.stringify({ text: transcript, mode: "type_label" })
}).then(r => r.json());

// result.redacted_text = "Patient [PERSON_NAME] (DOB: [DATE_OF_BIRTH])..."
// result.entities_found = 8
// result.cost.total_usd = 0.003500